参数资料
| 型号： | BD9853AFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SSOP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 4.5 V ~ 16 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9853AFV-E2DKR |
BD9853AFV
Technical Note
Setting the Short Circuit Protection (SCP) delay time
When the soft start is complete for each channel, the output voltage stabilizes at the set value 1.35V(typ) for the
SCP/SOFT1, 2 pins.
When any type of short circuit occurs, the voltage at the point of the fault is reduced. In this case, when voltage at the INV
pin falls to 0.56V(typ) or below, the SCP comparator sensor detects the short and further charges the SCP/SOFT pins for
the shorted channel from the 1.35V(typ) level. When the SCP/SOFT pins are charged to 2.3V(typ), the Pch/Nch MOSFET
is switched OFF.
The elapsed time from the occurrence of the output short to the point the external FET switches OFF is calculated with the
following formula:
0.95[V](typ)×Cscp/soft ［ F ］
tscp ＝
Isosofc
(typ:
2.3 μ A)[A]
tscp : SCP delay time, Cscp/soft : SCP/SOFT pin connection capacitance,Isoscp : charge current
* If the current more than the capacity of power supply when the short between VOUT and GND occurs, input voltage starts to fall and under voltage lockout
(UVLO) is activated at Vin < 4.15 V (typ.). The UVLO has FET driver output (OUT1H, OUT2H, OUT1L, OUT2L) off and external FETs become off. When
external FETs are not operating, input voltage returns because of the short between VOUT and GND and the UVLO is canceled. But input voltage starts to
fall again because the UVLO is not activated.
There is possibility that a series of behavior “output short → input voltage fall → UVLO activated → external FETs off → input voltage returns → UVLO
canceled → output short”. So please make provision like inserting FUSE in input line.
Pin conditions with the only single channel use
Pin conditions are shown in the following, when the only single channel out of 2 channels is used.
Use only CH1
? SCP/SOFT2, INV2 ? GND short
? FB2, OUT2H, OUT2L ? OPEN
● Application example
Use only CH2
? SCP/SOFT1, INV1 ? GND short
? FB1, OUT1H, OUT1L ? OPEN
4.7μF
VCC
0.1μF
VCC
1μF
VCC
4.7μF
RSS040P03
1
VCC
REGB
16
RSS040P03
VOUT1
(3.3V)
4.7μH
C6-K3L
(MITSUMI)
(ROHM)
1μF
2
3
4
OUT1H
OUT1L
REGA
OUT2H
OUT2L
STB
15
14
13
(ROHM)
VCC
4.7μH
C6-K3L
(MITSUMI)
VOUT2
(2.5V)
8.2kΩ
10kΩ
120pF
22kΩ
100kΩ
10μF
(ceramic）
RB081
L-20
(ROHM)
RSS065 10kΩ 680pF
NO3
(ROHM)
5
6
7
RT
FB1
INV1
GND
FB2
INV2
12
11
10
220pF 3.3kΩ
RSS065
NO3
(ROHM)
RB081
L-20
(ROHM)
10μF
(ceramic）
100kΩ
15kΩ
68pF
39kΩ
0.015μF
8
SCP/SOFT1
SCP/SOFT2
9
0.015μF
47kΩ
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
11/16
2009.05 - Rev.A
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