Datasheet > BD2046AFJ_09

BD2046AFJ_09

更新时间： 2024-01-20 23:52:59

品牌	Logo	应用领域
罗姆 - ROHM		开关
页数	文件大小	规格书
14页	353K
描述
2ch Small Current Output USB High Side Switch ICs

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中文翻译

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数据手册

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BD2046AFJ_09 数据手册

Technical Note

BD2046AFJ, BD2056AFJ

Functional description

1. Switch operation

IN terminal and OUT terminal are connected to the drain and the source of switch MOSFET respectively. And the IN

terminal is used also as power source input to internal control circuit.

When the switch is turned on from EN/EN control input, IN terminal and OUT terminal are connected by a 100mΩ switch.

In on status, the switch is bidirectional. Therefore, when the potential of OUT terminal is higher than that of IN terminal,

current flows from OUT terminal to IN terminal.

Since a parasitic diode between the drain and the source of switch MOSFET is canceled, in the off status, it is possible to

prevent current from flowing reversely from OUT to IN.

2. Thermal shutdown circuit (TSD)

Thermal shut down circuit have dual thermal shutdown threshold. Since thermal shutdown works at a lower junction

temperature when an overcurrent occurs, only the switch of an overcurrent state become off and error flag is output.

Thermal shut down action has hysteresis. Therefore, when the junction temperature goes down, switch on and error flag

output automatically recover. However, until cause of junction temperature increase such as output shortcircuit is removed

or the switch is turned off, thermal shut down detection and recovery are repeated. The thermal shut down circuit works

when the switch of either OUT1 or OUT2 is on (EN,/EN signal is active).

3. Over current detection (OCD)

The over current detection circuit limits current (I_SC) and outputs 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 shortcircuit status

When the switch is turned on while the output is in shortcircuit status or so, the switch gets in current limit status soon.

3-2. When the output shortcircuits while the switch is on

When the output shortcircuits or large capacity 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 VIN exceeds 2.3V(Typ.). If the VIN drops below 2.2V(Typ.) while

the switch turns on, then UVLO shuts off the switch. UVLO has hysteresis of a 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 detection of over current, thermal shutdown, low level is output.

Over current detection has delay filter. This delay filter prevents instantaneous current detection such as inrush current at

switch on, hot plug from being informed to outside.

www.rohm.com

2009.05 - Rev.A

9/13

1...6 7 8910 11 12...14

中文翻译

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与BD2046AFJ_09相关器件

型号	品牌	获取价格	描述	数据表
BD2046AFJ_11	ROHM	获取价格	2ch High Side Switch ICs for USB Devices and Memory Cards
BD2046AFJ_14	ROHM	获取价格	0.5A Current Limit High Side Switch ICs
BD2046AFJ-E2	ROHM	获取价格	0.5A Current Limit High Side Switch ICs
BD204F	ISC	获取价格	isc Silicon PNP Power Transistor
BD204-SM	ETC	获取价格	TRANSISTOR LEISTUNGS BIPOLAR
BD205	MOTOROLA	获取价格	10 AMPERE POWER TRANSISTOR NPN SILICON
BD2051AFJ	ROHM	获取价格	Silicon monolithic integrated circuit USB high side switch IC
BD2051AFJ-E2	ROHM	获取价格	1.0A Current Limit High Side Switch ICs
BD2052AFJ	ROHM	获取价格	High-Side Switch
BD2052AFJ-E2	ROHM	获取价格	Buffer/Inverter Based Peripheral Driver, 2 Driver, 1A, PDSO8, SOP-8

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