APL3203D datasheet(11/19 Pages) ANPEC

11 / 19 page

Rev. A.6 - Mar., 2013

www.anpec.com.tw

APL3203D

The output current is monitored by the internal OCP circuit.

When the output current reaches the OCP threshold, the

device limits the output current at OCP threshold level. If

the OCP condition continues for a blanking time of T

B(OCP),

the internal power FET is turned off. After the recovery

time of T

ON(OCP), the FET will be turned on again and the

output current is monitored again. The APL3203D has

have a built-in counter. When the total count of OCP fault

reaches 16, the FET is turned off permanently, requiring

either a V

IN POR or EN re-enable again to restart. The

OCP threshold is programmed by a resistor R

ILIM con-

nected from ILIM pin to GND. The OCP threshold is cal-

culated by the following equation:

The APL3203D provides an open-drain output to indicate

that a fault has occurred. When any of input OVP, OCP,

battery OVP, is detected, the FAULT goes low to indicate

that a fault has occurred. Since the FAULT pin is an open-

drain output, connecting a resistor to a pull high voltage

is necessary.

Enable/Shutdown

Pull the EN pin voltage above 1.4V to disable the device

and pull EN pin voltage below 0.4V to enable the device.

The EN pin has an internal pull-down resistor and can be

left floating. When the IC is latched off due to the total

count of OCP or battery OVP reaches 16, disable and re-

enable the device with the EN pin can clear the counter.

Over-Temperature Protection

When the junction temperature exceeds 140οC, 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 20οC, the internal thermal sense

circuit will enable the device, resulting in a pulsed output

during continuous thermal protection. Thermal protec-

tion is designed to protect the IC in the event of over tem-

perature conditions. For normal operation, the junction

temperature cannot exceed T

J=+125

οC.

The APL3203D monitors the BAT pin voltage for battery

over-voltage protection. The battery OVP threshold is in-

ternally set to 4.435V. When the BAT pin voltage exceeds

the battery OVP threshold for a blanking time of T

B(BOVP),

Battery Over-Voltage Protection

Function Description

Power-Up

The APL3203D has a built-in power-on-reset circuit to

keep the output shutting off until internal circuitry is oper-

ating 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 threshold and after 8ms blanking time, the output

voltage starts a soft-start to reduce the inrush current.

ILIM

OCP

Over-Current Protection (OCP)

Input Over-Voltage Protection (OVP)

The input voltage is monitored by the internal OVP circuit.

When the input voltage rises above the input OVP

threshold, the internal FET will be turned off within 1

µs to

protect connected system on OUT pin. When the input

voltage returns below the input OVP threshold minus the

hysteresis, the FET is turned on again after 8ms recovery

time. The input OVP circuit has a 200mV hysteresis and

a recovery time of T

ON(OVP) to provide noise immunity

against transient conditions.

the internal power FET is turned off. When the BP voltage

returns below the battery OVP threshold minus the

hysteresis, the FET is turned on again. The APL3203D

has a built-in counter. When the total count of battery OVP

fault reaches 16, the FET is turned off permanently, re-

quiring either a V

IN POR or EN re-enable again to restart.

FAULTOutput

where

ILIM=25000AΩ

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