参数资料
| 型号： | BD8157EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 13/20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
Technical Note
● Application Examples
* Although ROHM is sure that the application examples are recommendable ones, further check the characteristics of
components that require high precision before using them.When a circuit is used modifying the externally connected circuit
constant, be sure to decide allowing sufficient margins considering the dispersion of values by external parts as well as our
IC including not only the static but also the transient characteristic.
For the patent, we have not acquired the sufficient confirmation. Please acknowledge the status.
(1) When the charge pump is removed from the DC/DC converter to make it 3-channel output mode:
It is possible to create the charge pump by using the switching operation of DC/DC converter. When the application shown
in the following diagram is used, 1-channel DC/DC converter output, 1-channel positive side charge pump and 1-channel
negative side charge pump can be output as a total of 3 channels.
10uH
RB161M-20
10uF
VOUT
0.1uF
0.1uF
DAN217U
1
20
SW
CURRENT
PGND
1uF
1uF
SENSE
VCC
2.5V
10uF
VCC
2
SLOPE
+
DRV
19
GND
2SD2657k
ENB
3
OSC
SET
LOGIC
RESET SDWN
OCP
- 18
ERR
+ 1.245V
FB
0.1uF
VGH
FCLK
4
5
UVLO
TSD
BUFFER SUPPLY
PWM
+ -
SOFT
START
17
16
COMP
DAN217U
UDZ
Series
1uF
VS
SS
COMIN
6
15
VCOM
VCOM
1uF
IN1
IN2
7
8
9
14
13
12
OUT1
OUT2
V1
V2
V3
UDZ
Series
2SB1695k
VGL
IN3
10
OUT3
11
V4
1uF
IN4
TOP VIEW
OUT4
Fig. 38 3 ch Application Circuit Diagram Example
(2) When the output voltage is set to 0 V:
Since the switch does not exist between the input and output in the application using the step-up type DC/DC converter,
the output voltage is generated even if the IC is turned off. When it is intended to keep the output voltage 0 V until IC
operates, insert the switch as shown in the following circuit diagram.
10uH
RB161M-20
10uF
Vo
1
20
SW
CURRENT
PGND
VCC
2.5V
10uF
VCC
ENB
2
3
SLOPE
OSC
SENSE
+
SET
DRV
LOGIC
RESET SDW N
OCP
19
- 18
ERR
+ 1.245V
GND
FB
4
FCLK
5
UVLO
TSD
BUFFER SUPPLY
PW M
+ -
SOFT
START
17
16
COMP
VS
SS
COMIN
IN1
IN2
6
7
8
9
15
14
13
12
VCOM
OUT1
OUT2
VCOM
V1
V2
V3
IN3
OUT3
IN4
10
TOP VIEW
11
OUT4
V4
Fig. 39 Switch Application Circuit Diagram Example
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
13/17
2009.07 - Rev.B
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