BD8622EFV_09 [ROHM]
Built-in 1ch FET Light Load Type DC / DC converters; 内置1通道FET轻载型DC / DC转换器
| 型号： | BD8622EFV_09 |
| 厂家： | 
ROHM |
| 描述： | Built-in 1ch FET Light Load Type DC / DC converters |
| 文件： | 总16页 (文件大小：515K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
System Power Supply for TV Series
Built-in 1ch FET Light Load Type
DC / DC converters
BD8622EFV
No.09034EAT04
●Description
BD8622EFV has realized the high performance and reliability required as a power supply for thin-screen TV.
Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and
due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application
design.
As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal
protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not
easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for
thin-screen TV which requires the high reliability.
●Features
1)High efficiency in all load area
2)3.0A output current
3)PWM mode/PFM mode switch(automatic operation)
4)Low current mode/Rorripplmord switch with terminal MODE
5)Low RDS(ON) internal switches:75mΩ(typ.)
6)±1% reference voltage accuracy
7)Programmable frequency : 250kHz-1MHz
(Can the adjustment by an external synchronization and the terminal RT resistance.)
8)Terminal RT OPEN/SHORT detecting function
9)Over current protection function
10) Output over voltage/low voltage protection function (over : FB > VREF +60mV , low : FB < VREF -60mV)
11) Timer off latch function in abnormal circumstances
12) Thermal shutdown function
13) Under voltage protection
14) Soft start/start delay circuit
15) Soft start time out function
16) Protecting BUS function with terminal PDET
17) HTSSOP-B20 package
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
1/15
Technical Note
BD8622EFV
●Electrical characteristics
(Unless otherwise noted Ta=25℃, VIN=3.3V, GND=0V)
Specification value
Parameter
Symbol
UNIT
Condition
MIN
TYP
210
0
MAX
VIN supply current (operating)
VIN supply current (standby)
Reference voltage (VREF)
Output rise detection voltage
Output decrease detection voltage
Terminal PDET output current
Oscillation frequency
Pch FET ON resistance
UVLO voltage
SW leak current
EN terminal H threshold voltage
EN terminal L threshold voltage
FC sink current
FC source current
SS/DELAY terminal source current
Terminal PDET pull-up resistor
IQ_active
IQ_stby
VREF
VOVP
VLVP
IPDET
fOSC
RPFET
VUVLO
ILSW
VENH
VENL
IFCSI
IFCSO
ISSSO
RPDET
-
-
350
1
μA
μA
V
mV
mV
mA
kHz
mΩ
V
μA
V
V
μA
μA
μA
kΩ
VFB = 0.83V, VFC = 1V
VEN = 0V
0.792
30
-90
0.4
500
-
0.8
60
-60
-
550
75
2.50
0
0.808
90
-30
-
600
110
2.65
1
Monitoring FB terminal
Monitoring FB terminal
VPDET< 0.3V
RRT= 220kΩ
ISW = 1A
2.35
-
VEN= 0V, VIN = 5.5V
1.1
-
10
-
2
100
-
-
-
0.4
-
-10
6
20
-20
4
170
250
VFB :FB terminal voltage, VEN :EN terminal voltage, VFC :FC terminal voltage, VPDET: PDET terminal voltage
Current capability should not exceed Pd.
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2009.05 - Rev.A
2/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
●Block diagram
SGND
1
RT
OSC
20
0.8V
FC
FB
2
19
Err AMP
SS/DELAY
18
PDET
3
Detect Abnormal
Voltage
and Start error
NC
4
MODE
17
Shut
Down
EN
16
SW
5
en
enable
PWM/PFM
CONTROL
NC
15
SW
6
SVIN
14
SW
7
SVIN
Predrive
VIN
13
SW
8
VIN
12
NC
9
VIN
11
PGND
10
VIN
Fig1 Block diagram
●Pin Description
No. Symbol
Description
Explanation
Signal GND terminal
Small signal system GND
Output voltage detection
1
2
SGND
FB
Feed back terminal
Abnormal state notification and external IC
abnormality detection terminal
Protecting BUS communication terminal
3
PDET
4
5
NC
SW
SW
SW
SW
NC
6
Switching output terminal
7
8
9
Power GND terminal
GND for power MOSFET
10
11
12
13
14
15
16
PGND
VIN
VIN
VIN
VIN
NC
Power supply input terminal
Power supply input. The decoupling is done to PGND
Enable input
ON/OFF control for device operation
EN
The operation mode is switched according to the input voltage
at a light load.
MODE selection terminal
17
MODE
Soft start adjustment capacity connection terminal
Error amplifier output
The soft start time is adjusted with the connected capacitor
Error amplifier phase compensation point
18 SS/DELAY
19
20
FC
RT
Frequency adjustment resistance connection terminal The switching frequency is set by the connected resistance
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2009.05 - Rev.A
3/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
●Pin equivalence circuit diagram
No.
Symbol
Explanation
Terminal equivalent circuit diagram
1
SGND
GND (connected 0V)
2
FB
PDET
SW
Output voltage detection terminal
Protecting BUS I/O terminal
Output terminal
3
5,6,7,8
Power GND
(Same voltage as SGND)
10
11,12,13
14
PGND
PVIN
SVIN
Power supply input terminal
Power supply input terminal
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2009.05 - Rev.A
4/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
No.
Symbol
Explanation
Terminal equivalent circuit diagram
16
EN
Enable terminal
Operation mode switch terminal at
light load
17
MODE
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2009.05 - Rev.A
5/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
No.
Symbol
Explanation
Terminal equivalent circuit diagram
SS
/DELAY
18
Soft start time adjustment terminal
Error amplifier compensation
terminal
19
FC
Oscillator frequency adjustment
terminal
20
RT
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2009.05 - Rev.A
6/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
●Operation description
Enable control
The device can be controlled ON/OFF by EN terminal (16 pin) voltage.
An internal circuit starts when VEN reaches 1.1V.
When standing up of VIN is too steep (1msec or less), a defective start might be caused according to the state of Pascon
between GND substrate pattern and power supply-when the terminal EN is short-circuited to the terminal VIN and it is used.
VEN
EN terminal
VENH
VENL
0
VSS
VSSCLM
SS terminal
VSSTH
0
VO
Output setting voltage
0
t
SS
Fig.2 ON/OFF transition wave form in EN controlling
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2009.05 - Rev.A
7/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
Soft start time set function
As for BD8622EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS
and SGND terminal.
Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.
OSC oscillation frequency setting function
The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND
(range = 250kHz - 1MHz)
The relation between RT terminal resistance and the oscillation frequency follows Fig.4.
000
10
10
100
1000
10000
RT terminal resistance [kΩ]
Fig.4 RT resistance-oscillation frequency
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
8/15
Technical Note
BD8622EFV
Light load mode operation
・Low current mode
When the terminal MODE (17 pins) is made "H", low current mode operation becomes effective. The characteristic of the
efficiency valuing is obtained in low current mode operation at a light load.
VOUT
[20mV/DIV]
SW
[2V/DIV]
IL
[200mA/DIV]
Fig.5 Low current mode operation
・Low ripple mode
When the terminal MODE is made "L", the Low ripple mode operation becomes effective. It becomes operation of valuing a
low ripple in the Low ripple mode operation at a light load.
VOUT
[20mV/DIV]
SW
[2V/DIV]
IL
[200mA/DIV]
Fig.6 Low ripplemord operation
100
90
Low current mode
80
10
0
VIN=3.3V
VO=1.8V
Low ripple mord
Io=0～100mA
SW_f=550KHz(R11=220KΩ)
1
10
100
Negative overcurrent [mA]
Fig7 Light load mode efficiency comparison
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
9/15
Technical Note
BD8622EFV
● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection
operation.
Low voltage protection function (LVP)
The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF.
If FB terminal voltage falls below VLVP(= VREF -60mV) and the state continues for 500us, output changes to low voltage and
the state is fixed. In that case , PDET (3pin) output changes to L.
Table 1 output low voltage protection function
Low voltage
EN
terminal
SS
terminal
Low voltage
FB terminal
protection
operation
protection function
>VENH
<VLVP
>VLVP
-
-
ON
>1.4V(typ)
Effective
OFF
OFF
OFF
<1.4V(typ)
-
Invalidity
Invalidity
<VENL
＊ Low voltage protection function is available when SS terminal voltage becomes more than
1.4V (typ) in the transition to ON control (during soft start).
Over voltage protection function(OVP)
The voltage of the terminal FB is compared with internal reference voltage VREF.
If FB terminal voltage is over Vovp (=VREF +60mV) and the state is continues for 500usec, output changes to low voltage
and the state is fixed.
Table 2 output overvoltage protection function
EN
terminal
>VENH
Over voltage
protection function
Over voltage
protection operation
ON
OFF
OFF
OFF
SS terminal
>1.4V(typ)
FB terminal
>VOVP
<VOVP
-
-
Effective
<1.4V(typ)
-
Invalidity
Invalidity
<VENL
＊ Over voltage protection function is available when SS terminal voltage becomes more than
1.4V (typ) in the transition to ON control (during soft start).
VFB
VREF＋60ｍV
FB terminal
voltage
VREF
VREF-60ｍV
0
ON
Protection
OFF
LVP
OVP
LVP
PDET
terminal
HIGH
LOW
Fig.8 Output voltage error detection range
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
10/15
Technical Note
BD8622EFV
Under voltage lock out protection (UVLO)
As for BD8622EFV, the power-supply voltage decrease detection protection circuit is built in.
It the input voltage decrease below the UVLO voltage (2.5V typ), the device state changes to the standby mode (Moreover,
to prevent the chattering of the output) hysteresis width of 100mV(typ) has been installed in the UVLO cancel voltage.
RT terminal open/short protection function (RTO/RTS)
RT terminal opening/short protection function prevent the clock from abnormal oscillation.
If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed.
Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates
when the state continues about 500μsec(typ).
Soft start time-out function
If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8622EFV controls an off latch.
Vo is fixed in a low level.
VSSTH
SS terminal
0V
64msec（ｔyp）
Fig.9 Soft start time-out
Thermal shut down function
Thermal shut down circuit (TSD circuit) is built into BD8622EFV. When the temperature of the chip exceeds Tjmax=175, the
DC/DC converter is fixed in a low voltage.
TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175.
It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set.
Over current protection function
The over current protection function has been achieved by limiting the current that flows on high side MOSFET.
The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about
500μsec(typ), the output is fixed in a low level.
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2009.05 - Rev.A
11/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
Protecting BUS function with terminal PDET
The terminal PDET (3 pins) monitors whether IC is normal or not. When IC becomes abnormal, the PDET output is reduced
at "L" level with the output voltage fixed “L” level at the same time. Moreover, it is possible to make the output fix in a low
level by compulsorily reducing the terminal PDET at "L" level from the outside.
When two or more BD8622EFV is used in the application, this function prevents the IC from destroying, because one IC
error transmits all other ICs by PDET line in the condition that PDET terminals are connected each other.
VIN
VIN
170kΩ
170kΩ
PDET PDET
IC_A
IC_B
Fig.10 Protecting BUS communication
※Please give the terminal PDET as OPEN when you do not use protecting BUS function.
Error detection (off latch) release method
BD8622EFV enters the state of an off latch when the protection function operates.
To release the off latch state, EN terminal voltage should be changed to low level once time.
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2009.05 - Rev.A
12/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
●Each characteristic reference data
Vout : 100mV/div
VIN = 5V
Io = 3A
Vout : 20mV/div
Io = 1A/div
100usec/div
1usec/div
Fig.11 Output load response
Fig.12 Output ripple
VIN = 2V/div
VIN = 3.3V
VOUT = 0.5V/div
VIN = 5.0V
VOUT = 1.8V
fosc = 550kHz
LC mode
SS = 2V/div
10msec/div
Fig.13 Efficiency
Fig.14 Soft start
VIN = 5.0V
VOUT = 1.8V
Fig.15 Regulation
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
13/15
Technical Note
BD8622EFV
VIN = 3.3V
VIN = 3.3V
Fig.16 Reference voltage - Temperature characteristic
Fig.17 SS Charging current - Temperature characteristic
VIN = 3.3V
Ta = 25℃
Fig.18 Switching frequency-power-supply voltage
Fig.19 Switching frequency-temperature characteristic
VIN = 3.3V
Ta = 25℃
Fig.20 PMOS on resistance-power-supply voltage
Fig.21 PMOS on resistance-temperature characteristic
VIN = 3.3V
Ta = 25℃
VFB = 0.83V
VFC = 1.0V
SW = H
Fig.22 Terminal EN H voltage-temperature characteristic
Fig.23 Circuit current-power-supply voltage characteristic
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2009.05 - Rev.A
14/15
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8622EFV
●Ordering part number
B D
8
6
2
2
E
F
V
-
E
2
Part No
Part No.
Package
EFV: HTSSOP-B20
Packaging and forming specification
E2: Embossed tape and reel
HTSSOP-B20
<Dimension>
<Tape and Reel information>
Tape
Embossed carrier tape
6.5 0.1
Quantity
2500pcs
20
11
Direction
of feed
E2
(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)
1
10
+0.05
−0.03
0.325
0.17
S
0.08
S
0.65
0.2 −+00..0045
Direction of feed
1pin
Reel
（Unit:mm)
※When you order , please order in times the amount of package quantity.
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
15/15
Notice
N o t e s
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,
fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of
any of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
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More detail product informations and catalogs are available, please contact us.
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© 2009 ROHM Co., Ltd. All rights reserved.
R0039
A
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