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BD8157EFV PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD8157EFV
기능 Single-channel Source Voltage Output Power Supply + Gamma Buffer Amp IC
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BD8157EFV 데이터시트, 핀배열, 회로
Power Supply IC Series for TFT-LCD Panels
Single-channel Source Voltage
Output Power Supply + Gamma Buffer Amp ICs
BD8151EFV,BD8157EFV
No.09035EBT11
Description
The BD8151EFV,BD8157EFV power supply IC are designed for use with TFT-LCD panels. It incorporates a built-in source
voltage step-up switching regulator and gamma correction buffer amp. The combination of a source power supply and
gamma correction buffer on a single chip delivers significant cost savings.
Compatible with input voltages from 2.5 V to 5.5 V (BD8151EFV), 2.1 V to 4.0 V (BD8157EFV), the IC supports low-voltage
operation and reaches over 85% efficiency with a 2.5 V input, contributing to low power consumption designs.
Features
1) Single-chip implementation of a source power supply and gamma correction buffer
2) Support for low-voltage operation, with input voltages from 2.5 V to 5.5 V (BD8151EFV)
2.1 V to 4.0 V (BD8157EFV)
3) Built-in 1.4 A, 0.2 low-voltage FET
4) Switchable step-up DC/DC switching frequencies: 600 kHz/1.2 MHz
5) Current mode PWM control
6) Under-voltage lockout protection circuit
7) Built-in overcurrent protection circuit
8) Built-in thermal shutdown circuit
Applications
Satellite navigation systems, laptop PC TFT LCD panels
LCD monitor panels
Absolute maximum ratings (Ta = 25)
Parameter
Symbol
Limit
Power supply voltage
Vcc 7
Power dissipation
Operating temperature range
BD8151EFV
BD8157EFV
Pd
Topr
1000*
40 to +85
40 to +125
Storage temperature range
Tstg 55 to +150
Switching pin current
Isw 1.5**
Switching pin voltage
Vsw 15
VS voltage
VS 15
Maximum junction temperature
Tjmax
* Reduced by 8 mW/over 25, when mounted on a glass epoxy board (70 mm x 70 mm x 1.6 mm).
** Must not exceed Pd.
150
Unit
V
mW
A
V
V
°C
Recommended Operating Ranges (Ta = 25)
Parameter
Power supply voltage BD8151EFV
Power supply voltage BD8157EFV
Switching current
Switching pin voltage
VS pin voltage
Symbol
Vcc
Vcc
ISW
VSW
VS
Min.
2.5
2.1
5
Limit
Typ.
3.3
2.5
9
Max.
5.5
4.0
1.4
14
14
Unit
V
V
A
V
V
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© 2009 ROHM Co., Ltd. All rights reserved.
1/17
2009.07 - Rev.B




BD8157EFV pdf, 반도체, 판매, 대치품
BD8151EFV, BD8157EFV
Reference Data (Unless otherwise specified, Ta = 25)
1.75
1.50
1.25
1.00
0.75
-40
25
0.50
0.25
150
0.00
0 0.5 1 2 3 4 5
SUPPLY VOLTAGE : VCC[V]
Fig. 1 Total Supply Current
6
2.0
1.5
1.0 125
0.5
0.0
-0.5 25-40
-1.0
-1.5
-2.0
0
12 3
SUPPLY VOLTAGE : VCC[V]
Fig. 2 Standby Current
4
0
-4
-8
-12
-16
-20
0
0.5 1 1.5 2
SS VOLTAGE : VSS[V]
Fig. 4 SS Source Current
2 .4
20
2.0
BD8157EFV
1.5
1.0
0.5
0.0
0
1.5 3 4.5 6
SUPPLY VOLTAGE : VCC[V]
7.5
Fig. 5 Reference Voltage
Temperature
20
15 125
10 25
5 -40
0
0.0 0.5 1.0 1.5 2.0 2.5
FCLK VOLTAGE : FCLK[V]
Fig. 7 FCLK Pin Current
3.0
100
95
90
85
80
-40 0 40 80 112250
AMBIENT TEMPERATURE : Ta[]
Fig. 10 Max. Duty Ratio Temperature
15
125
10 25
5
-40
0
0.0 0.5 1.0 1.5 2.0 2.5
ENB VOLTAGE : VENB[V]
Fig. 8 ENB Pin Current
3.0
100
VCC=2.5V f=600kHz
90
80 VCC=2.5V f=1200kHz
70
60
BD8157EFV
50
0 0.05 0.1 0.15 0.2 0.25 0.3
OUTPUT CURRENT : IO[A]
Fig. 11 Vcc = 2.5 V Power
Efficiency
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© 2009 ROHM Co., Ltd. All rights reserved.
4/17
Technical Note
1.260
1.255
1.250
1.245
1.240
1.235
1.230
-40 -15 10 35 60 85 110
AMBIENT TEMPERATURE : Ta[]
Fig. 3 Reference Voltage
Temperature
2000
1500
VFCLK=VCC
1000
500
VFCLK=GND
0
-40 -15 10 35 60 85 110
AMBIENT TEMPERATURE : Ta[]
Fig. 6 Switching Frequency
Temperature
100
50
0
-50
-100
1.0 1.1 1.2 1.3 1.4 1.5
COMP VOLTAGE : VCOMP[V]
Fig. 9 COMP Sinking vs Source
Current
100
VCC=3.3V f=600kHz
90
80
70 VCC=3.3V f=1200kHz
60
BD8151EFV
50
00.02 0.15 0.3 0.45 0.6
OUTPUT CURRENT : IO[A]
Fig. 12 Vcc = 3.3 V Power
Efficiency
2009.07 - Rev.B

4페이지










BD8157EFV 전자부품, 판매, 대치품
BD8151EFV, BD8157EFV
Description of Operation of Each Block
10uH
RB161M-20
Technical Note
10uF
Vo
VCC
2.5V
10uF
20kΩ
20kΩ
20kΩ
20kΩ
20kΩ
20kΩ
20kΩ
1
SW
2
VCC
3
ENB
4
FCLK
5
VS
6
COMIN
7
IN1
8
IN2
9
IN3
10
IN4
CURRENT
SENSE
SLOPE
OSC
+
DRV
SET LOGIC
RESET SDWN OCP
20
PGND
19
GND
ERR-
18
+ 1.245V FB
100kΩ
15kΩ
UVLO
TSD
BUFFER SUPPLY
PW
+
-M
TOP VIEW
SOFT
START
17
COMP
5.1kΩ 3300pF
16
SS
0.01uF
15
VCOM
14
OUT1
13
OUT2
12
OUT3
11
OUT4
VCOM
V1
V2
V3
V4
Fig. 26 Application Circuit Diagram
Error amp (ERR)
This is the circuit to compare the reference voltage 1.245 V (Typ.) and the feedback voltage of output voltage. The COM
pin voltage resulting from this comparison determines the switching duty. At the time of start, since the soft start is
operated by the SS pin voltage, the COMP pin voltage is limited to the SS pin voltage.
Oscillator (OSC)
This block generates the oscillating frequency. Either a 600 kHz or 1.2 MHz (Typ.) frequency can be selected with the
FCLK pin.
SLOPE
This block generates the triangular waveform from the clock generated by OSC. Generated triangular waveform is sent to
the PWM comparator.
PWM
The COMP pin voltage output by the error amp is compared to the SLOPE block's triangular waveform to determine the
switching duty. Since the switching duty is limited by the maximum duty ratio which is decided internally, it does not
become 100%.
Reference voltage (VREF)
This block generates the internal reference voltage of 1.245 V (Typ.).
Protection circuit (UVLO/TSD)
UVLO (under-voltage lockout protection circuit) shuts down the circuits when the voltages are 2.2 V (Typ.BD8151EFV)
1.8 V (Typ.ND8157EFV) or lower. Thermal shutdown circuit shuts down IC at 175°C (Typ.) and recovers at 160°C (Typ.).
Overcurrent protection circuit (OCP)
Current flowing to the power FET is detected by voltage at the CURRENT SENSE and the overcurrent protection operates
at 3 A (Typ.). When the overcurrent protection operates, switching is turned off and the SS pin capacity is discharged.
Soft start circuit
Since the output voltage rises gradually while restricting the current at the time of startup, it is possible to prevent the
output voltage overshoot or the inrush current.
Buffer amp and VCOM
This buffer amp is used to set the gamma correction voltage, which can be set in from 0.2 V to (VOUT - 0.2 V). Use the
VOUT resistance division to set the gamma correction voltage. The VCOM voltage is set similarly.
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© 2009 ROHM Co., Ltd. All rights reserved.
7/17
2009.07 - Rev.B

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부품번호상세설명 및 기능제조사
BD8157EFV

Single-channel Source Voltage Output Power Supply + Gamma Buffer Amp IC

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