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参数资料
| 型号： | BD2056AFJ-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 16/25页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH HIGH SIDE 2CH SOP-J8 |
| 特色产品： | High Side Switch Regulators |
| 标准包装： | 1 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 2 |
| 导通状态电阻： | 100 毫欧 |
| 电流 - 输出 / 通道： | 250mA |
| 电流 - 峰值输出： | 500mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP-J |
| 包装： | 标准包装 |
| 产品目录页面： | 1371 (CN2011-ZH PDF) |
| 其它名称： | BD2056AFJ-E2DKR |
BD2046AFJ
BD2056AFJ
Datasheet
3. Over current detection (OCD)
The over current detection circuit limits current (I SC ) and outputs an error flag (/OC) when current flowing in each switch
MOSFET exceeds a specified value. There are three types of response against over current. The over current detection
circuit works when the switch is on (EN,/EN signal is active).
3-1. When the switch is turned on while the output is in short circuit status:
When the switch is turned on while the output is in short-circuit status, the switch goes into current limit status
immediately.
3-2. When the output short circuits while the switch is on:
When the output short circuits or high-current load is connected while the switch is on, very large current flows until
the over current limit circuit reacts. When the current detection limit circuit works, current limitation is carried out.
3-3. When the output current increases gradually:
When the output current increases gradually, current limitation does not work until the output current exceeds the
over current detection value. When it exceeds the detection value, current limitation is carried out.
4. Under voltage lockout (UVLO)
UVLO circuit prevents the switch from turning on until the V IN exceeds 2.3V(Typ.). If the V IN drops below 2.2V(Typ) while
the switch turns on, then UVLO shuts off the switch. UVLO has hysteresis of 100mV(Typ).
Under voltage lockout circuit works when the switch of either OUT1 or OUT2 is on (EN,/EN signal is active).
5. Error flag (/OC) output
Error flag output is N-MOS open drain output. At At detection of over current and/or thermal shutdown, the output level is
low.
Over current detection has delay filter. This delay filter prevents instantaneous current detection such as rush current at
switch on, hot plug from being informed to outside.
V /EN
V OUT
Output shortcircuit
Thermal shut down
I OUT
V /OC
delay
Figure 36. Over current detection, thermal shutdown timing
(BD2046AFJ)
V EN
V OUT
Output shortcircuit
Thermal shut down
I OUT
V /OC
delay
Figure 37. Over current detection, thermal shutdown timing
(BD2056AFJ)
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
16/22
TSZ02201-0E3E0H300140-1-2
11.Mar.2013 Rev.001
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