APL3216 datasheet(6/12 Pages) ANPEC

6 / 12 page

Rev. A.7 - Dec., 2011

APL3216

www.anpec.com.tw

Function Description

ACIN Power-On-Reset (POR)

The APL3216 is built-in a power-on-reset circuit to keep

the output shut off until internal circuitry is operating

properly. The POR circuit has hysteresis and a de-glitch

feature so that it will typically ignore undershoot transients

on the input. When input voltage exceeds the POR thresh-

old and after 8ms blanking time, the output voltage starts

a soft-start to reduce the inrush current.

ACIN Over-Voltage Protection (OVP)

The CHR_LDO output of the IC operates similar to a lin-

ear regulator. If the input voltage rises above V

OVP, the

internal transistor will be turned off within 5

µs to protect

connected system on OUT pin. When the input voltage

returns below the input OVP threshold minus the

hysteresis, the transistor is turned on again after 1ms

recovery time. The input OVP circuit has a 200mV hyster-

esis and a recovery time of T

ON(OVP) to provide noise im-

munity against transient conditions.

Charging Current Control

The charging current is controlled by the GATDRV pin.

When sourcing a current from the GATDRV pin, the OUT

pin delivers the charging current which is 200-fold mag-

nified in amplitude based on GATDRV?¦s current. The I

OUT

current can be calculated by this following equation:

OUT=200*IGATDRV

where

The I

OUT is the current flowing out from OUT pin.

The I

GATDRV is the current flowing out from GATDRV pin.

Current Limit

The output current is monitored by the internal Current

Limit circuit. When the output current reaches the over

current trip threshold, the device limits the output current

at current limit threshold.

Temperature Protection

When the junction temperature exceeds 160oC, the inter-

nal thermal sense circuit turns off the power FET and

allows the device to cool down. When the device’s junc-

tion temperature cools by 40oC, the internal thermal

sense circuit will enable the device, resulting in a pulsed

output during continuous thermal protection. Thermal

protection is designed to protect the IC in the event of

over temperature conditions. For normal operation, the

junction temperature cannot exceed T

J=+125

oC.

The APL3216 VIN input pin fully supports the IEC61000-

4-2. That means the VIN pin has immunity of ±15kV ESD

discharge in Air condition, and immunity of ±8kV ESD dis-

charge in Contact condition.

ESD Tests

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