APL5536JACI-TRG Просмотр технического описания (PDF) - Anpec Electronics

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APL5536JACI-TRG

Dual Channel 300mA Low Dropout Linear Regulator

Anpec Electronics 

APL5536

Function Description

VIN Under-Voltage Lockout (UVLO)

The APL5536 has a built-in under-voltage lockout circuit

to keep the outputs shuting off until internal circuitry is

operating properly. The UVLO circuit has a hysteresis

and a de-glitch feature so that it will typically ignore un-

dershoot transients on the input.

Soft-Start (For Each Channel)

The APL5536 provides an internal soft-start circuitry to

control rise rate of the output voltage and limit the current

surge during start-up. The output voltage starts the soft-

start at approximate 60µs after the VIN is over the UVLO

threshold. The typical soft-start interval is about 60µs.

Over-Temperature Protection

An over-temperature protection circuitry limits the junc-

tion temperature of APL5536. When the junction tempera-

ture exceeds +160oC, the over-temperature protection

circuitry disables the LDO outputs, allowing the device to

cool down. The LDO outputs are enabled again after the

junction temperature cools down by 40oC, resulting in a

pulsed output during continuous thermal overload

conditions. Over-temperature protection is designed to

protect the IC in the event of over temperature conditions.

For reliable operation, the junction temperature cannot

exceed T =+125oC

J

Current-Limit Protection (For Each Channel)

The APL5536 provides a current-limit protection function.

During current-limit, the device limits output current at

current-limit threshold. For reliable operation, the device

should not be operated in current-limit for extended period.

Short-Circuit Current-Limit Protection (For Each

Channel)

When the output voltage drops below 0.8V, which is

caused by the over load or short circuit, the device limits

the output current down to a safe level. The short circuit

current limit is used to reduce the power dissipation dur-

ing short circuit conditions. If the junction temperature is

over the over-temperature threshold, the device will enter

the thermal shutdown.

Enable/Disable (For Each Channel)

Pulling the VEN1/2 above 1.5V enables the respective LDO

output, and pulling V below 0.4V disables the respec-

EN1/2

tive LDO output. EN1/2 pins are internally pulled low by

resistors. If shutdown function is not used, connect EN1/

2 to VIN for normal operation. The enable inputs are com-

patible with both TTL and CMOS logic levels.

Copyright © ANPEC Electronics Corp.

9

Rev. A.1 - Aug., 2010

www.anpec.com.tw

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