参数资料
| 型号： | BD8157EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUP 1-CH HTSSOP-B20 |
| 标准包装： | 2,500 |
| 应用： | TFT-LCD 面板：伽玛缓冲器，VCOM 驱动器 |
| 电流 - 电源： | 1.2mA |
| 电源电压： | 2.1 V ~ 4 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-HTSSOP-B |
| 包装： | 带卷 (TR) |
BD8151EFV, BD8157EFV
● Description of Operation of Each Block
10uH
RB161M-20
10uF
Technical Note
Vo
1
20
SW
CURRENT
PGND
VCC
2.5V
10uF
VCC
ENB
2
3
SLOPE
OSC
SENSE
+
SET
DRV
LOGIC
RESET SDWN
OCP
19
- 18
ERR
+ 1.245V
GND
FB
100k Ω
15k Ω
4
FCLK
5
UVLO
TSD
BUFFER SUPPLY
PWM
+ -
SOFT
START
17
16
COMP
5.1k Ω 3300pF
20k Ω
20k Ω
VS
COMIN
6
15
SS
VCOM
0.01uF
VCOM
20k Ω
20k Ω
IN1
7
14
OUT1
V1
8
13
V2
20k Ω
IN2
OUT2
9
12
V3
20k Ω
IN3
OUT3
IN4
10
TOP VIEW
11
OUT4
V4
20k Ω
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.
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
7/17
2009.07 - Rev.B
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