APW8811 datasheet(15/23 Pages) ANPEC

15 / 23 page

Rev. A.3 - Sep., 2012

APW8811

www.anpec.com.tw

Function Description (Cont.)

Table 1. Operating Mode Truth Table

MODE

CONDITION

COMMENT

Run

ENLDO = 1, EN PWM =1

PWM is in normal operation.

Standby & Soft-Stop ENPWM=0, ENLDO=1

If PWMx is in shutdown, discharge switch (25

Ω) connects their

VOUTx to GND. LDOx and REF active.

Shutdown

EN PWM=0 and EN LDO=0

PWMx output discharge switch (25

Ω) connects VOUTx to GND.

LDOx discharge switch (40

Ω) connects LDOx to GND. In this

mode, all circuitry is off.

UVP

Either VOUT1, or VOUT2 < 70% of nominal

output voltage

The internal 25

Ω switch turns on to pull low output voltage.

LDOx and REF are active. Reset by toggling EN PWM or EN

LDO single.

OVP

Either VOUT1 and VOUT2 > 125% of normal

output voltage

LGATE of two PWM channel are forced high. LDO and REF

active. Reset by toggling ENPWM or ENLDO single.

OTP

TJ > +160

All circuitry off. It is non-latch protection after the junction

temperature cools by 25

oC.

Table 2. Power-Up Control Logics

VENLDO

VEN PWM

LDO5

LDO3

PWM1

PWM2

Low

Don’t Care

OFF

High

Low

OFF

High

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