BD8624EFV [ROHM]
Built-in 1ch FET Synchronous Rectification Type DC/DC converters; 内置1通道FET同步整流型DC / DC转换器![BD8624EFV](http://pdffile.icpdf.com/pdf1/p00143/img/icpdf/BD862_792119_icpdf.jpg)
型号: | BD8624EFV |
厂家: | ![]() |
描述: | Built-in 1ch FET Synchronous Rectification Type DC/DC converters |
文件: | 总15页 (文件大小:634K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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TECHNICAL NOTE
System Power Supply for TV Series
Built-in 1ch FET
Synchronous Rectification Type
DC/DC converters
BD8628EFV, BD8624EFV
●Description
BD8628EFV / BD8624EFV have realized the high performance and reliability required as a power supply for thin-screen TV.
With built-in FET 1ch current mode control, the DC/DC Converter series has the advantage of high-speed load response and wide
phase margin.
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) 1ch synchronous rectification step-down system DC/DC converter
2) Soft start, soft off function
3) Built-in low voltage / overvoltage protection function
4) Built-in overcurrent protection function
5) Frequency setting by external resistance is available. (RT terminal)
6) Protection time setting by external resistance is available. (RSET terminal)
7) Built-in RT / RSET terminal open/short protection function
8) Protection control with built-in sequencer
9) Built-in adjustment function time of off latch
10) Built-in error state detection signal output function
11) Built-in tracking function
12) Corresponded to protecting bus
13) Load current Maximum 3A
14) HTSSOP-B24 Package
Aug. 2008
● Electric characteristic
(Ta=25℃, VCC=6.5V, GND=0V,CTL=6.5V unless otherwise specified.)
specification value
Parameter
Symbol
UNIT
μA CTL=0V
Condition
MIN
-
-
TYP
0
3.4
MAX
10
-
Circuit current 1
Circuit current 2
IQ1
IQ2
mA CTL=VCC
< Error amplifier part >
Standard voltage (VREF)
Terminal FB Input bias current
Terminal FC Clamping voltage H
Terminal FC Clamping voltage L
Terminal FC Sink current
Terminal FC Source current
Open loop gain
VREF
IFBB
VFCH
0.792
0.8
0
-
-
-
-
0.808
1
-
0.2
-
-70
-
V
Terminal FB and FC terminal short
-1
1.8
-
0.5
-
μA VFB=0.9V
V
V
mA VFB=0.9V, VFC=0.4V
μA VFB=0.7V, VFC=1.6V
dB
VFB=0.7V
VFB=0.9V
VFCL
IFCSINK
IFCSOURCE
AVERR
-
100
<OSC part>
When terminal RT 27kΩ is
connected
Oscillation frequency
FOSC
400
500
600
kHz
<Soft start >
Charging current
ISS
-3
0.98
2.2
0.1
49
-2.5
1.08
2.4
0.15
70
-2
1.18
-
-
91
1.2
μA VSS=1.0V
Terminal SS Threshold voltage
Terminal SS Clamping voltage
Terminal SS Standby voltage
Terminal SS Discharge resistance
Terminal SS Protection circuit start voltage
Terminal SS Protection circuit start voltage
Maximum hysteresis error
VSSTH
VSSCLM
VSSSTB
RSS
V
V
VSS Voltage
V
kΩ
V
VSS Voltage (L→H)
CTL=0V
VSS Voltage (L→H)
VSSPON
1.0
1.1
VSSPON_HYS
10
100
200
mV VSS Voltage
< Low voltage, over voltage detection part>
Terminal FB Low voltage detection voltage
Terminal FB Overvoltage detection voltage
VLVP
VOVP
0.51
0.86
0.56
0.96
0.61
1.06
V
V
VFB Voltage
VFB Voltage
< Over current detection part>
Output current limitation threshold
<Power MOS>
Ilmt
VCC-0.9 VCC-0.7 VCC-0.5
V
VSW Voltage
Upper side MOS ON resistance
Lower side MOS ON resistance
<Others>
RONU
RONL
-
-
110
110
-
-
mΩ
VBOOT-VSW =5V
mΩ VVREG5=5V
Terminal PDET L output voltage
VOL_PDET
VIH_CTL
VIL_CTL
II_CTL
-
2.0
-
-
-
-
0.4
VCC
0.5
V
V
V
IOL=100uA
CTL terminal
CTL terminal
Terminal CTL input voltage H level voltage
Terminal CTL input voltage L level voltage
Terminal CTL input current
-
60
90
μA CTL terminal, CTL=VCC
VFB : FB terminal voltage, VFC : FC terminal voltage, VSS : SS terminal voltage, VMONVCC : MONVCC terminal voltage
Not designed for radiation resistance.
Current capability should not exceed Pd.
2 / 14
Permissible loss
This package is a product of which the feature is the high heat radiation, and connect the back to GND
based on recommended land pattern when you mount.
Tj max
Tcmax
Destruction Destruction
temperature temperature
TSTGmin
TSTGmax
Ta min
Ta max
jc
/W]
ja
θ
/W]
℃
θ
℃
[
[
[
]
[
]
[
]
[
]
℃
℃
℃
℃
[
]
℃
[
]
℃
19.0
31.3
-50.0
150.0
-45.0
85.0
150.0
150.0
ROHM standard substrate specification
Material 4 layer glass epoxy substrate(back copper foil70mm×70mm)
Size 70mm×70mm×1.6mmt(Sarmalbiaing is in the substrate.)
Figure 1 Heat decrease curve
※These values are the actual measurement values, and no guarantee values.
3 / 14
● Block diagram
VREF
RT
RT
SS
FB
OSC
OPEN/SHORT
OSC
OSC
RSET
e
t i m
OVP
LVP
PDET
PIO
FC
PROTECT
BUS
I/F
SEQ
Control
GND
VREG5
CTL
VCC
CTL
VREG5
BOOT
SW
Driver
Control
PVCC
PVCC
TEST2
TEST1
N.C.
SW
N.C.
N.C.
PGND
PGND
N.C.
Figure-2 Block diagram・Application diagram
● Terminal explanation
No.
Symbol
Description
No.
Symbol
Description
1
2
PGND
PGND
Power GND terminal
Power GND terminal
13
14
RT
Frequency adjustment resistance connection terminal
Off latch effective time adjustment resistance terminal
RSET
No wire connection.
(Connect to GND. )
No wire connection.
(Connect to GND. )
3
4
N.C.
N.C
15
16
PDET
Error state notification terminal
Error state notification
PIO
and external IC error detection terminal
5
6
SW
SW
SW terminal
SW terminal
17
18
CTL
Enable input
VCC
VCC power supply terminal
High side Power MOS gate drive
power source terminal
7
BOOT
19
PVCC
Power VCC terminal
8
9
VREG5
GND
FC
Internal power supply (5.0V) output terminal
20
21
22
PVCC
TEST2
TEST1
Power VCC terminal
GND
Test terminal (Connect to GND. )
Test terminal (Connect to GND. )
10
Phase amends terminal
No wire connection.
(Connect to GND. )
No wire connection.
(Connect to GND. )
11
12
FB
SS
Feedback terminal
23
24
N.C.
N.C.
Soft start adjustment capacity connection terminal
※Please give to VCC+0.3V as an operation condition in all input terminals except the terminal BOOT.
However, please do not exceed the absolute maximum rating as VCC=PVCC.
Table 1 Terminal explanation
4 / 14
● Terminal equivalent circuit chart
Terminal
Terminal
Explanation
Terminal equivalent circuit chart
No.
name
Power GND
1
2
PGND
PGND
(The same potential as the GND
terminal)
Power GND
(The same potential as the GND
terminal)
PVCC
PVCC
5
6
SW
SW
SW terminal
SW terminal
⑤
⑥
PGND
VREG5
High side Power MOS gate drive power source
terminal
7
BOOT
⑦
PGND
8
9
VREG5
Internal power supply (5.0V) output terminal
GND
GND
10
FC
Phase amends terminal
5 / 14
Terminal
No.
Terminal
name
Explanation
Terminal equivalent circuit chart
VCC
VCC
11
FB
Voltage detection terminal
⑪
GND
Soft start adjustment capacity connection
terminal
12
SS
Frequency adjustment resistance connection
terminal
13
14
RT
Off latch effective time adjustment resistance
terminal
RSET
15
PDET
Error state notification terminal
6 / 14
Terminal
No.
Terminal
name
Explanation
Terminal equivalent circuit chart
Error state notification and external IC error
detection terminal
16
PIO
17
21
22
CTL
Enable input
TEST2
TEST1
Test terminal (Connect to GND. )
Test terminal (Connect to GND. )
19
20
PVCC
PVCC
Power VCC terminal
Power VCC terminal
7 / 14
● Operation description
ON/OFF control
DC/DC converter ON/OFF function
DC/DC converter controller can be controlled ON/OFF by CTL terminal.
Analog circuit starts operation at ON control (on mode), and goes down to setting output voltage.
Analog circuit should be standby at OFF control (off mode), and output voltage becomes 0V.
Table1 DC/DC converter ON/OFF function
CTL terminal voltage
>VIHCTL
<VILCTL
ON control
OFF control
Soft start time set function
DC/DC converter can do soft start without overshoot by charging soft start capacity (Css) connected between SS
terminal and GND by charging current at ON control.
The mute of the output is released when it reaches VSS=0.15V (VSSSTB), and the output voltage does the soft start
operation from the point of VSS=0.3V (typ) in proportion to the voltage of the terminal SS.
Also, soft start time (tss) can be set by setting soft start capacity arbitrarily.
Soft start time (tss) should be set at 3msec < tss < 30msec.
※Please note that the overshoot is not caused in the output setting voltage when setting it to tss≦3msec.
V
C
SS
SSTH
t
SS
I
SS
Discharge function
DC/DC converter can do soft off by discharging load discharged to soft start capacity connected between SS terminal
to GND by discharging resistance at OFF control.
Soft off operates in proportion to the voltage of the terminal SS the output voltage from the point of VSS=0.8V (typ).
Figure 2 Wave form at ON/OFF control
8 / 14
OSC oscillation frequency setting function
SW output oscillation frequency of DC/DC converter can be set by installing resistance between RT terminal and GND
externally.
10000
1000
100
10
1
10
100
1000
RT terminal resistance[KΩ]
*Reference date
Figure 3 Terminal RT resistance-oscillation frequency
Range of terminal RT connection resistance setting
23kΩ≦Rrt≦135kΩ
(100kHz≦fosc≦600kHz)
9 / 14
PROTECT BUS Input/output function
The terminal PIO is PROTECT BUS Input/output terminal. The terminal PIO is Hi-Z when DC/DC usually operates. When the
terminal PIO becomes LOW by connecting PROTECT BUS, DC/DC is turned off. Afterwards, when the terminal PIO becomes
HIGH, it reactivates.
DC/DC is Off latch when DC/DC error detects it and the terminal PDET becomes LOW.
Table2 PIO terminal, PDET terminal output function
DC/DC
PIO terminal
PDET terminal
DC/DC
Error detection
Undetection
Undetection
Detection
Hi-Z
LOW
LOW
Hi-Z
Hi-Z
LOW
ON
OFF
Off latch
PROTECT BUS Timing chart
If two or more BD8628EFV/BD8633EFV/BD8624FV/BD8630FV is connected in PROTECT BUS, and it uses at the same time,
when one IC error detects, all remaining IC becomes PIO = Low at the same time, and the output is turned off.
Protecting BUS part timing chart
IC_A detects error.
OFF LATCH
IC_A
High
PDET
PIO
LOW
LOW
High
IC_A
PIO
IC_A
PIO
High
IC_B
PIO
LOW
IC_B
IC_B
Vo
DC/DC OFF
0V
High
IC_B
PDET
When two or more BD8628EFV/BD8633EFV/BD8624FV/BD8630FV is used at the same time,
If one IC error detects, all IC becomes DC/DC OFF at the same time.
10 / 14
● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection
operation.
Low voltage protection function(LVP)
Low voltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter
compared to internal reference level.
Low voltage protection function operates when FB terminal voltage falls below VLVP (=0.7 × VREF) and continues more
than set time in external resistance.
Table 4 Low voltage protection function
CTL
terminal
Low voltage
protection function
Low voltage
protection operation
SS terminal
>1.1V(typ)
FB terminal
<VLVP
ON
Enable
>VIHCTL
>VLVP+VLVP_HYS
OFF
OFF
OFF
<1.0V(typ)
-
-
-
Disable
Disable
<VILCTL
※Constant voltage protection function is enabled when SS terminal voltage becomes more than 1.1V (typ) in the transition
to ON control (during soft start).
Overvoltage protection function (OVP)
Overvoltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter
controller compared to internal reference level.
Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.2 × VREF) and continues more
than set time in external resistance.
Table 5 Overvoltage protection function
CTL
terminal
Overvoltage
protection function
Overvoltage
protection operation
ON
SS terminal
FB terminal
>VOVP
>1.1V(typ)
Enable
>VIHCTL
<VOVP
OFF
OFF
OFF
<1.0V(typ)
-
-
-
Disable
Disable
<VILCTL
※Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the
transition to ON control (during soft start).
Figure 5-1.Low voltage / overvoltage protection
11 / 14
Overcurrent protection function (OCP)
Overcurrent protection function compared drain voltage (LX terminal voltage) with internal OCP terminal voltage when
internal Nch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS
would be OFF.
Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and
continues more than set time in external resistance.
Table 6 overcurrent protection function
CTL
terminal
>VIHCTL
Overcurrent
protection function
Overcurrent
protection operation
ON
SS terminal
Output current
>1.1V(typ)
>Ilmt
<Ilmt
-
Enable
OFF
OFF
OFF
<1.0V(typ)
-
Disable
Disable
<VILCTL
-
DRV
A
DRV
B
Output
current
Rocp
LX
OCP
Figure 5-2.Overcurrent protection
RT terminal open/short protection function
RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short
condition internally from RT terminal to prevent from output voltage error caused by error oscillation of
internal triangular wave at RT terminal open/short.
RT terminal open/short protection function is regularly enabled after boot-up.
RT terminal open/short protection function operates when error detection condition continues more than set
time in external resistance.
12 / 14
Soft start time-out function
DC/DC converter off-latch-controls when VSS does not exceed VSSPON from VSS > VSSSTB+VSSSTB_HYS after 50msec (typ)
passed from soft start.
Figure 5-3. At soft start time-out
Error detection (off latch) release method
DC/DC converter becomes off latch condition when protection function operates. Off latch can be released by the
following method. DC/DC converter controller of each Ch becomes able to do ON control transition by releasing off latch.
1. Set all Ch CTL terminal voltage as < VILCTL and continue that condition about more than 200usec (typ).
2. Drop down power supply VCC to below 2.7V(TYP).
Error detection time set function
Time from the error detection to the off latch can be set by putting resistance outside between GND and RSET terminal.
3
t
1.810 Rrset[usec]
offlatch
Rset setting range
10kΩ≦Rset≦75kΩ
(18usec≦tofflach≦135usec)
13 / 14
HTSSOP-B24
<Dimension>
<Tape and Reel information>
Tape
Embossed carrier tape
Quantity
2000pcs
7.8 0.1
+6
−4
4
Direction
of feed
E2
24
13
(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)
+0.05
−0.03
1
12
0.17
0.08
0.325
S
0.65
+0.05
−0.04
0.2
M
0.08
Direction of feed
1pin
Reel
(Unit:mm)
※When you order , please order in times the amount of package quantity.
Catalog No.08T277A'08.8 ROHM ©
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact your nearest sales office.
THE AMERICAS / EUROPE / ASIA / JAPAN
ROHM Customer Support System
Contact us : webmaster@ rohm.co.jp
www.rohm.com
TEL : +81-75-311-2121
FAX : +81-75-315-0172
Copyright © 2008 ROHM CO.,LTD.
21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan
Appendix1-Rev2.0
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