BM2P074KF [ROHM]
内置AC/DC用MOSFET的PWM方式DC/DC转换器BM2P074KF-G为所有存在插口的产品提供优良的系统。绝缘、非绝缘均可对应，可轻松设计各种形式的低功耗转换器。内置800V耐压启动电路，有助于实现低功耗。外接开关用电流检测电阻，可实现高自由度的电源设计。使用电流模式控制，进行逐周期电流限制，发挥带宽和瞬态响应的优异性能。开关频率固定为65kHz。轻负载时降低频率，实现高效率。内置跳频功能，有助于实现低EMI。内置800V耐压MOSFET，设计简便。;
| 型号： | BM2P074KF |
| 厂家： | 
ROHM |
| 描述： | 内置AC/DC用MOSFET的PWM方式DC/DC转换器BM2P074KF-G为所有存在插口的产品提供优良的系统。绝缘、非绝缘均可对应，可轻松设计各种形式的低功耗转换器。内置800V耐压启动电路，有助于实现低功耗。外接开关用电流检测电阻，可实现高自由度的电源设计。使用电流模式控制，进行逐周期电流限制，发挥带宽和瞬态响应的优异性能。开关频率固定为65kHz。轻负载时降低频率，实现高效率。内置跳频功能，有助于实现低EMI。内置800V耐压MOSFET，设计简便。 开关 转换器 |
| 文件： | 总22页 (文件大小：1182K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Datasheet
AC/DC Drivers
PWM type DC/DC converter IC
Included 800V MOSFET
BM2P074KF-G
●General
The PWM type DC/DC converter (BM2P074KF-G) for
●Features
PWM frequency : 65kHz
PWM current mode method
AC/DC provide an optimum system for all products
that include an electrical outlet.
Burst operation when load is light
Frequency reduction function
Built-in 800V start circuit
BM2P074KF-G supports both isolated and
non-isolated devices, enabling simpler design of
various types of low-power electrical converters.
BM2P074KF-G built in a HV starter circuit that
tolerates 800V, it contribut to low-power consumption.
With current detection resistors as external devices, a
higher degree of design freedom is achieved. Since
current mode control is utilized, current is restricted in
each cycle and excellent performance is demonstrated
in bandwidth and transient response.
Built-in 800V switching MOSFET
VCC pin under voltage protection
VCC pin overvoltage protection
SOURCE pin Open protection
SOURCE pin Short protection
SOURCE pin Leading-Edge-Blanking function
Per-cycle over current protection circuit
Soft start
The switching frequency is 65 kHz. At light load, the
switching frequency is reduced and high efficiency is
achieved.
A frequency hopping function is also on chip, which
contributes to low EMI.
Secondary Over current protection circuit
●Package
W(Typ.) x D(Typ.) x H(Max.)
5.00mm x 6.20mm x 1.71mm
SOP8
We can design easily, because BM2P074KF-G
includes the switching MOSFET.
●Basic specifications
Operating Power Supply Voltage Range:
VCC 10.2V to 26.0V
●Applications
DRAIN：～800V
AC adapters and household appliances (vacuum
cleaners, humidifiers, air cleaners, air conditioners, IH
cooking heaters, rice cookers, etc.)
Operating Current:
Normal Mode : 0.85mA (Typ.)
Burst Mode:0.40mA (Typ.)
65kHz(Typ.)
Oscillation Frequency:
Operating Temperature:
- 40deg. to +105deg.
MOSFET ON Resistance: BM2P074KF-G:6.7Ω(Typ)
●Application circuit
Figure 1．Application circuit
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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●Absolute Maximum Ratings（Ta=25C）
Parameter
Symbol
Rating
Unit
Conditions
Maximum applied voltage 1
Maximum applied voltage 2
Maximum applied voltage 3
Drain current pulse
Vmax1
-0.3～30
-0.3～6.5
800
2.00
0.56
-40 ～ +105
150
-55 ～ +150
V
V
V
VCC
Vmax2
Vmax3
IDP
Pd
Topr
SOURCE, FB
DRAIN
PW=10us, Duty cycle=1%
When implemented
A
Allowable dissipation
W
oC
oC
oC
Operating temperature range
MAX junction temperature
Storage temperature range
Tjmax
Tstr
(Note1) SOP8 : When mounted (on 70 mm × 70 mm, 1.6 mm thick, glass epoxy on single-layer substrate).
Reduce to 4.504 mW/C when Ta = 25C or above.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the
absolute maximum ratings.
●Operating Conditions（Ta=25C）
Parameter
Power supply voltage range 1
Power supply voltage range 2
Symbol
VCC
VDRAIN
Rating
10.2～26.0
～800
Unit
V
V
Conditions
VCC pin voltage
DRAIN pin voltage
●Electrical Characteristics of MOSFET part (Unless otherwise noted, Ta = 25C )
Specifications
Parameter
Symbol
Unit
V
Conditions
Min
Typ
Max
[MOSFET Block ]
Between drain and
source voltage
V(BR)DDS
800
-
-
ID=1mA / VGS=0V
Drain leak current
On resistance
IDSS
RDS(ON)
-
-
-
100
9.6
uA
Ω
VDS=800V / VGS=0V
ID=0.25A / VGS=10V
6.7
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●Electrical Characteristics of Control IC (Unless otherwise noted, Ta = 25C, VCC = 16 V)
Specifications
Parameter
[Circuit current]
Symbol
Unit
Conditions
MIN
TYP
MAX
Circuit current (ON) 1
ION1
ION2
650
-
850
400
1050
500
μA
μA
FB=2.0V(at pulse operation)
FB=0.0V(at burst operation)
Circuit current (ON) 2
[VCC protection function]
VCC UVLO voltage 1
VCC UVLO voltage 2
VCC UVLO hysteresis
VCC OVP voltage 1
VCC OVP voltage 2
Latch released VCC voltage
VCC Recharge start voltage
VCC Recharge stop voltage
Latch mask time
VUVLO1
VUVLO2
VUVLO3
VOVP1
VOVP2
VLATCH
VCHG1
VCHG2
TLATCH
TSD
13.8
8.8
-
26.0
-
14.8
9.5
5.30
27.5
23.5
VUVLO2-0.5
10.0
14.3
100
15.8
10.2
-
29.0
-
V
V
V
V
V
V
V
V
us
C
VCC rise
VCC drop
VUVLO3= VUVLO1- VUVLO2
VCC rise
VCC drop
-
-
9.0
13.3
50
11.0
15.3
150
-
Thermal shut down temperature
118
145
Control IC
[PWM type DCDC driver block]
Oscillation frequency 1
Oscillation frequency 2
Frequency hopping width 1
Hopping fluctuation frequency
Soft start time 1
Soft start time 2
Soft start time 3
Soft start time 4
Maximum duty
FSW1
FSW2
FDEL1
FCH
TSS1
TSS2
TSS3
TSS4
Dmax
RFB
60
20
-
65
25
4.0
125
0.50
1.00
2.00
8.00
75.0
30
70
30
-
175
0.70
1.40
2.80
11.20
82.0
37
KHz FB=2.00V
KHz FB=0.40V
KHz FB=2.0V
Hz
ms
ms
ms
ms
%
75
0.30
0.60
1.20
4.80
68.0
23
FB pin pull-up resistance
ΔFB / ΔCS gain
FB burst voltage
kΩ
V/V
Gain
VBST
-
4.00
0.400
-
0.300
0.500
V
FB drop
FB voltage of
VDLT
1.100
1.250
1.400
V
starting Frequency reduction mode
FB OLP voltage 1a
FB OLP voltage 1b
FB OLP ON timer
FB OLP start up timer
FB OLP OFF timer
VFOLP1A
VFOLP1B
TFOLP1A
TFOLP1B
TFOLP2
2.60
-
40
26
358
2.80
2.60
64
32
512
3.00
-
88
38
666
V
V
ms
ms
ms
Overload is detected (FB rise)
Overload is detected (FB drop)
[Over current detection block]
Overcurrent detection voltage
VCS
0.380
0.400
0.100
0.150
0.200
0.300
250
0.420
V
V
Ton=0us
Overcurrent detection voltage SS1
Overcurrent detection voltage SS2
Overcurrent detection voltage SS3
Overcurrent detection voltage SS4
Leading Edge Blanking Time
VCS_SS1
VCS_SS2
VCS_SS3
VCS_SS4
TLEB
-
-
-
-
-
-
-
-
-
-
0[ms] ~ TSS1[ms]
TSS1 [ms] ~ TSS2 [ms]
TSS2 [ms] ~ TSS3[ms]
TSS3 [ms] ~ TSS4 [ms]
V
V
V
ns
Over current detection AC Voltage
compensation factor
SOURCE pin
KCS
12
20
28
mV/us
V
VCSSHT
0.020
0.050
0.080
short protection voltage
[ Start circuit block ]
Start current 1
Start current 2
ISTART1
ISTART2
0.100
1.000
0.500
3.000
1.000
6.000
mA
mA
VCC= 0V
VCC=10V
Inflow current from Drain pin
after UVLO released UVLO.
When MOSFET is OFF
OFF current
ISTART3
VSC
-
10
20
uA
V
Start current switching voltage
0.800
1.500
2.100
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●PIN DESCRIPTIONS
Table 1 Pin Description
Function
ESD Diode
VCC GND
NO.
Pin Name
I/O
1
2
3
4
5
6
7
8
VCC
N.C.
I
-
Power supply input pin
-
-
○
-
-
-
-
N.C.
-
-
DRAIN
SOURCE
N.C.
I/O
I/O
-
MOSFET DRAIN pin
MOSFET SOURCE pin
-
-
-
○
-
○
-
GND
I/O
I
GND pin
○
-
-
FB
Feedback signal input pin
○
●I/O Equivalent Circuit Diagram
Figure 2. I/O Equivalent Circuit Diagram
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●Block Diagram
VH
+
VO
FUSE
Diode
Filter
CM
AC
Bridge
Vs
-
Cvcc
DRAIN
VCC
4
1
VCC UVLO
+
Starter
-
14 .8 V
/ 9.5V
4. 0V
Line Reg
VCC OVP
+
-
100us
Filter
10uA
12 V Clamp
Circuit
27.5V
Internal Block
S
R
Q
DRIVER
PWM Control
4.0V
4. 0V
30k
OLP
FB
-
1M
8
64ms
Timer
+
Current
Limiter
SOURCE
Leading Edge
Blanking
Burst
Comparator
+
-
5
(typ=250ns)
-
+
Rs
AC Input
Soft Start
Compensation
PWM
Comparator
MAX
-
+
DUTY
GND
7
Frequency
Hopping
OSC
(65kHz)
+
Slope
Compensation
FeedBack
With
Isolation
Figure 3. Block Diagram
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●Description of Blocks
( 1 ) Start circuit (DRIAN : 4pin)
This IC built in Start circuit (tolerates 800V). It enables to be low standby mode electricity and high speed starting.
After starting, consumption power is idling current ISTART3（typ=10uA） only.
Reference values of Starting time are shown in Figure6. When Cvcc=10uF it can start less than 0.1 sec.
+
FUSE
AC
Diode
Bridge
85-265 Vac
-
DRAIN
SW1
VCC
Cvcc
+
-
VCCUVLO
Figure4. Block diagram of start circuit
Figure 5. Start current vs VCC voltage
* Start current flows from the DRAIN pin
Figure 6. Start time( reference value)
ex) Consumption power of start circuit only when the Vac=100V
PVH＝100V*√2*10uA=1.41mW
ex) Consumption power of start circuit only when the Vac=240V
PVH＝240V*√2*10uA=3.38mW
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(2 ) Start sequences
(Soft start operation, light load operation, and auto recovery operation during overload protection)
Start sequences are shown in Figure 7. See the sections below for detailed descriptions.
Switching
Figure 7. Start sequences Timing Chart
A: Input voltage VH is applied
B: This IC starts operating VCC pin voltage rises when VCC > VUVLO1 (14.8 V typ). Switching function starts when other
protection functions are judged as normal. Between the secondary output voltage become constant level, because the
VCC pin consumption current causes the VCC value to drop. VCC recharge function start if VCC voltage < VCHG2 （10V
typ）
C: With the soft start function, overcurrent limit value is restricted to prevent any excessive rise in voltage or current.
D: When the switching operation starts, VOUT rises. The output voltage become to stable state, also VCC voltage become
to stable state through auxiliary winding. Please set to achieve at the rated voltage within the TFOLP1B period (32ms typ)
from VCC voltage > VUVLO1
.
E: When there is a light load it reaches FB voltage < VBST (= 0.4Vtyp, burst operation is used to keep power consumption
down. During burst operation, it becomes low-power consumption mode.
F: When the FB Voltage＞VFOLP1A（=2.8V.typ）, it becomes a overload
G: When FB pin voltage keeps VFOLP1A (= 2.8V typ) at or above T FOLP1A(64ms typ), the overload protection function is
triggered and switching stops 64ms later. If the FB pin voltage becomes FB<VFOLP1B even once, the IC’s FB OLP timer is
reset.
H: If the VCC voltage drops to VCC < VUVLO2 (9.5V typ) or below, restart is executed.
I: The IC’s circuit current is reduced and the VCC pin value rises. (Same as B)
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(3) VCC pin protection function
BM2P074KF-G built in VCC low voltage protection function of VCCUVLO (Under Voltage Lock Out), over voltage
protection function of VCC OVP (Over Voltage Protection) and VCC charge function that operates in case of dropping the
VCC voltage.
This function monitors VCC pin and prevent VCC pin from destroying switching MOSFET at abnormal voltage.
VCC charge function stabilizes the secondary output voltage to be charged from the high voltage line by start circuit at
dropping the VCC voltage.
(3-1) VCC UVLO ／ VCC OVP function
VCCUVLO is auto recovery protection. VCCOVP is auto recovery protection that has voltage hysteresis.
Refer to the operation Figure8.
Switching is stopped by the VCCOVP function when VCC pin voltage > Vovp1(typ=27.5V), and switching is restart when
VCC pin voltage < Vovp2(typ=23.5V)
VOVP1
VOVP2
VUVLO1
VCHG2
VCHG1
VUVLO2
ON
ON
OFF
ON
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
A
B C
D
F
I
J
A
E
G
H
Figure 8. VCC UVLO / OVP Timing Chart
A: DRAIN voltage input, VCC pin voltage starts rising.
B: VCC>VUVLO1, DC/DC operation starts
C: VCC< VCHG1, VCC charge function operates and the VCC voltage is rise.
D: VCC > VCHG2, VCC charge function is stopped.
E: VCC > VOVP1 continues TLATCH(typ =100us), switching is stopped by the VCCOVP function.
F: VCC < VOVP2 , switching operation restarts
G: VH is OPEN.VCC Voltage is fall.
H: Same as C.
I: Same as D.
J: VCC<VUVLO2, switching is stopped by the VCC UVLO function
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（3-2）VCC Charge function
VCC charge function operates once the VCC pin >VUVLO1 and the DC/DC operation starts then the VCC pin voltage drops
to <VCHG1. At that time the VCC pin is charged from DRAIN pin through start circuit.
By this operation, BM2P074KF-G doesn’t occur to start failure.
VCC pin voltage is rise, then VCC >VCHG2, charge is stopped. The operations are shown in Figure9.
VH
VUVLO1
VCHG2
VCC
VCHG1
VUVLO2
Switching
VH charge
charge
charge
charge
charge
OUTPUT
voltage
A
B C D E
F G H
Figure 9. Charge operation VCC pin charge operation
A: DRAIN pin voltage rises, charge starts to VCC pin by the VCC charge function.
B: VCC > VUVLO1, VCC UVLO function releases, VCC charge function stops, DC/DC operation starts.
C: When DC/DC operation starts, the VCC voltage drops.
D: VCC < VCHG1, VCC recharge function operates.
E: VCC > VCHG2, VCC recharge function stops.
F: VCC < VCHG1, VCC recharge function operates.
G: VCC < VCHG1, VCC recharge function stops.
H: After start of output voltage finished, VCC is charged by the auxiliary winding VCC pin stabilizes.
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( 4 ) DCDC driver (PWM comparator, frequency hopping, slope compensation, OSC, burst)
BM2P074KF-G is current mode PWM control.
An internal oscillator sets a fixed switching frequency (65kHz typ).
BM2P074KF-G is integrated switching frequency hopping function which changes the switching frequency to fluctuate as
shown in Figure10 below.
The fluctuation cycle is 125 Hz typ.
Switching Frequency
[kHz]
500us
69
68
67
66
65
64
63
62
61
125 Hz(8ms)
Time
Figure 10. Frequency hopping function
Max duty cycle is fixed as 75% (typ) and MIN pulse width is fixed as 400 ns (typ).
With current mode control, when the duty cycle exceeds 50% sub harmonic oscillation may occur.
As a countermeasure to this, BM2P074KF-G is built in slope compensation circuits.
BM2P074KF-G is built in burst mode circuit and frequency reduction circuit to achieve lower power consumption, when the
load is light.
FB pin is pull up by RFB (30 kΩ typ).
FB pin voltage is changed by secondary output voltage (secondary load power).
FB pin is monitored, burst mode operation and frequency detection start.
Figure 11 shows the FB voltage, and switching frequency, DCDC operation
・mode1 : Burst operation
・mode2 : Frequency reduction operation
・mode3 : Fixed frequency operation.(operate at the max frequency)
・mode4 : Over load operation.(detect the over load state and stop the pulse operation)
Figure 11. Switching operation state changes by FB pin voltage
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(5) Over Current limiter
BM2P074KF-G is built in Over Current limiter per cycle. If the SOURCE pin over a certain voltage, switching is stopped. It is
also built in AC voltage compensation function. The function is rise over current limiter level by time to compensate at the max
power for AC voltage change.
Shown in Figure12,13, 14.
Figure 12. No AC voltage compensation function
Figure13. buit-in AC compensation voltage
Primary peak current is decided as the formula below.
Primary peak current: Ipeak = Vcs/Rs + Vdc/Lp*Tdelay
Vcs：Over current limiter voltage internal IC, Rs：Current detection resistance, Vdc input DC voltage, Lp：Primary inductance,
Tdelay：delay time after detection of over current limiter
Figure 14. Over current limiter voltage
（6）L.E.B period
When the driver MOSFET is turned ON, surge current occurs at each capacitor component and drive current.
Therefore, when SOURCE pin voltage rises temporarily, the detection errors may occur in the over current limiter circuit.
To prevent detection errors, DRAIN is switched from high to low and the SOURCE signal is masked for 250 ns by the on-chip
LEB (Leading Edge Blanking) function.
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(7) SOURCE pin (5pin) short protection function
When the SOURCE pin is shorted, BM2P074KF-G is over heat.
BM2P074KF-G built in short protection function to prevent destroying.
(8) SOURCE pin (5pin) open protection
If the SOURCE pin becomes OPEN, BM2P074KF-G may be damaged.
To prevent to be damaged, BM2P074KF-G built in OPEN protection circuit（auto recovery protection）.
(9) Output over load protection function （FB OLP Comparator）
The output overload protection function monitors the secondary output load status at the FB pin, and stops switching when
an overload occurs. When there is an overload, the output voltage is reduced and current no longer flows to the photo
coupler, so the FB pin voltage rises.
When the FB pin voltage > VFOLP1A (2.8 V typ) continuously for the period TFOLP1A (64ms typ), it is judged as an overload
and stops switching.
When the FB pin > VFOLP1A (2.8 V typ), if the voltage goes lower than VFOLP1B (2.6V typ) during the period TFOLP1A (64ms
typ), the overload protection timer is reset. The switching operation is performed during this period TFOLP1A (64ms typ).
At startup, the FB voltage is pulled up to the IC’s internal voltage, so operation starts at a voltage of VFOLP1A (2.8 V typ) or
above. Therefore, at startup the FB voltage must be set to go to VFOLP1B (2.6 Vtyp) or below during the period TFOLP1B (32ms
typ), and the secondary output voltage’s start time must be set within the period TFOLP1B (32ms typ)following startup of the IC.
Recovery from the once detection of FBOLP, after the period TFOLP2(512 ms typ)
Figure 15. Over load protection (Auto recovery)
A: The FBOLP comparator detects over load for FB>VFOLP1A
B: States of A continuously for the period TFOLP1A (64ms typ), it is judged as an overload and stops switching after 64ms
later.
C: While switching stops for the over load protection function, the VCC pin voltage drops and VCC pin voltage reaches <
VCHG1 , the VCC charge function operates so the VCC pin voltage rises.
D: VCC charge function stops when VCC pin voltage > VCHG2
E: If TFOLP2 （typ =512ms） go on from B point, Switching function starts on soft start.
F: If TFOLP1A (64ms typ) go on from E point to continues a overload condition (FB>VFOLP1A).Switching function stops
at F point.
G: While switching stops VCC pin voltage drops to < VCHG1, VCC charge function operates and VCC pin voltage rises.
H: If VCC pin (1pin) voltage becomes over VCHG2 by the VCC charge function, VCC charge function operation stops
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●Operation mode of protection circuit
Operation mode of protection functions are shown in Table2.
Table2 Operation mode of protection circuit
Function
Operation mode
VCC Under Voltage Locked Out
VCC Over Voltage Protection
TSD
Auto recovery
Auto recovery
Latch（with 100us timer）
Auto recovery（with 64ms timer）
FB Over Limited Protection
SOURCE Short Protection
SOURCE Open Protection
Auto recovery
Auto recovery
●Sequence
The sequence diagram is show in Fig16.
All condition transits OFF Mode VCC<9.5V
VCC< 9.5V
ALL MODE
OFF MODE
VCC >14.8V
Soft Start1
Time>0.5ms
Soft Start2
Time>1.0ms
Soft Start3
Time>2.0ms
VCC< 9.5V
Soft Start4
VCC OVP
( Pulse Stop)
SOURCE OPEN
( Pulse Stop)
Time>8.0ms
VCC< 23.5V
NORMAL
FBOLP
OFF TIMER
(512ms)
OPEN
VCC >27.5V
Temp
>145℃
LATCH OFF MODE
( PulseStop)
Normal MODE
FB >2.80V
NORMAL
SHORT
FB<0.40V
FB>2.80V
(64ms)
FB
>0.40V
FB <2.60V
SOURCE SHORT
( Pulse Stop)
OLP MODE
( Pulse Stop)
PULSE OFF
Burst MODE
( Pulse OFF)
Figure 16. The sequence diagram
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● Thermal loss
The thermal design should set operation for the following conditions.
(Since the temperature shown below is the guaranteed temperature, be sure to take a margin into account.)
1. The ambient temperature Ta must be 105℃ or less.
2. The IC’s loss must be within the allowable dissipation Pd.
The thermal abatement characteristics are as follows.
(PCB: 70 mm × 70mm × 1.6 mm, mounted on single-glass epoxy single-layer substrate)
Figure 17. SOP8 Thermal Abatement Characteristics
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●Ordering Information
4 K F
B M 2 P 0 7
-
GE 2
Pakage
F : SOP8
Packaging and forming specification
E2:Embossed tape and reel
Part Number
●Marking Diagram
1PIN MARK
P074K
LOT No.
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Physical Dimension, Tape and Reel Information
Package Name
SOP8
(Max 5.35 (include.BURR))
(UNIT : mm)
PKG : SOP8
Drawing No. : EX112-5001-1
<Tape and Reel information>
Tape
Embossed carrier tape
2500pcs
Quantity
E2
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
(
)
Direction of feed
1pin
Reel
Order quantity needs to be multiple of the minimum quantity.
∗
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Operational Notes
1.
Reverse Connection of Power Supply
Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when
connecting the power supply, such as mounting an external diode between the power supply and the IC’s power
supply pins.
2. Power Supply Lines
Design the PCB layout pattern to provide low impedance supply lines. Separate the GND and supply lines of the
digital and analog blocks to prevent noise in the GND and supply lines of the digital block from affecting the analog
block. Furthermore, connect a capacitor to GND at all power supply pins. Consider the effect of temperature and
aging on the capacitance value when using electrolytic capacitors.
3. GND Voltage
Ensure that no pins are at a voltage below that of the GND pin at any time, even during transient condition.
4. GND Wiring Pattern
When using both small-signal and large-current GND traces, the two GND traces should be routed separately but
connected to a single GND at the reference point of the application board to avoid fluctuations in the small-signal
GND caused by large currents. Also ensure that the GND traces of external components do not cause variations on
the GND voltage. The GND lines must be as short and thick as possible to reduce line impedance.
5. Thermal Consideration
Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in
deterioration of the properties of the chip. The absolute maximum rating of the Pd stated in this specification is when
the IC is mounted on a 70mm x 70mm x 1.6mm glass epoxy board. In case of exceeding this absolute maximum
rating, increase the board size and copper area to prevent exceeding the Pd rating.
6. Recommended Operating Conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately obtained.
The electrical characteristics are guaranteed under the conditions of each parameter.
7. Inrush Current
When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may
flow instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power
supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of GND wiring, and
routing of connections.
8.
Operation Under Strong Electromagnetic Field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
9. Testing on Application Boards
When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may
subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply
should always be turned off completely before connecting or removing it from the test setup during the inspection
process. To prevent damage from static discharge, GND the IC during assembly and use similar precautions during
transport and storage.
10. Inter-pin Short and Mounting Errors
Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in
damaging the IC. Avoid nearby pins being shorted to each other especially to GND, power supply and output pin.
Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and
unintentional solder bridge deposited in between pins during assembly to name a few.
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Operational Notes – continued
11. Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and
extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small
charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and
cause unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the
power supply or GND line.
12. Regarding the Input Pin of the IC
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a
parasitic diode or transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should
be avoided.
Figure 18. Example of hic IC scture
13. Ceramic Capacitor
When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with
temperature and the decrease in nominal capacitance due to DC bias and others.
14. Area of Safe Operation (ASO)
Operate the IC such that the output voltage, output current, and power dissipation are all within the Area of Safe
Operation (ASO).
15. Thermal Shutdown Circuit(TSD)
This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should always be
within the IC’s power dissipation rating. If however the rating is exceeded for a continued period, the junction
temperature (Tj) will rise which will activate the TSD circuit that will turn OFF all output pins. The IC should be powered
down and turned ON again to resume normal operation because the TSD circuit keeps the outputs at the OFF state
even if the TJ falls below the TSD threshold.
Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no
circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC from heat
damage.
16. Over Current Protection Circuit (OCP)
This IC incorporates an integrated overcurrent protection circuit that is activated when the load is shorted. This
protection circuit is effective in preventing damage due to sudden and unexpected incidents. However, the IC should
not be used in applications characterized by continuous operation or transitioning of the protection circuit.
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date
Rev. No.
001
Revision Point
New Release
2015.02.27
P2 explanation of package power
P3 An explanation of Symbol
Change Ion1(Min) value from 600uA to 650uA.
P4 Change the Table1 Format
002
2017.03.14
P7 An explanation of Start sequences
P8 An explanation of Figure8
P12 An explanation of OUTPUT over load protection function
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Notice
Precaution on using ROHM Products
1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅣ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅢ
2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3. Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4. The Products are not subject to radiation-proof design.
5. Please verify and confirm characteristics of the final or mounted products in using the Products.
6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7. De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in
the range that does not exceed the maximum junction temperature.
8. Confirm that operation temperature is within the specified range described in the product specification.
9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice-PGA-E
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Precautions Regarding Application Examples and External Circuits
1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2. You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
A two-dimensional barcode printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign
trade act, please consult with ROHM in case of export.
Precaution Regarding Intellectual Property Rights
1. All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data.
2. ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the
Products with other articles such as components, circuits, systems or external equipment (including software).
3. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM
will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to
manufacture or sell products containing the Products, subject to the terms and conditions herein.
Other Precaution
1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4. The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
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General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall not be in an y way responsible or liable for failure, malfunction or accident arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or
concerning such information.
Notice – WE
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