APW8812 Datasheet, PDF (16/24 Pages) Anpec Electronics Coropration – System Power PWM Controller for Notebook Computers with Charge Pump

APW8812
Function Description (Cont.)
Table 1. Operating Mode Truth Table
MODE
CONDITION
COMMENT
Run
ENLDO = 1, ENILIMx =1
PWM is in normal operation.
Standby &
Soft-Stop
Shutdown
UVP
OVP
OTP
ENPWM=0, ENLDO=1
If PWMx is in shutdown, discharge switch (25 Ω) connects their
VOUTx to GND. LDOx and REF active.
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.
Either VOUT1, or VOUT2 < 70% of nominal output
voltage
Either VOUT1 and VOUT2 > 125% of normal output
voltage
The internal 25Ω switch turns on to pull low output voltage.
LDOx and REF are active. Reset by toggling ENILIM1 and
ENILIM2 (logic AND) or EN LDO single.
LGATE of two PWM channel are forced high. LDOx and REF
active. Reset by toggling ENILIM1 and ENILIM2 (logic AND) or
ENLDO single.
TJ > +160 ^oC
All circuitry off. It is non-latch protection after the junction
temperature cools by 25^oC.
Table 2. Power-Up Control Logics
VENLDO
Low
VENILIM1
Don’t Care
VENILIM2
Don’t Care
0.8V ~ 1.6V
Low
Low
0.8V ~ 1.6V
High
High
0.8V ~ 1.6V
High
Low
0.8V ~ 1.6V
0.8V ~ 1.6V
0.8V ~ 1.6V
> 2.4V
Low
High
High (after
ENILIM2 is
high without
60µs)
Low
High
High (after
ENILIM1 is
high without
60µs)
High
Low
> 2.4V
High
High
> 2.4V
High
Low
> 2.4V
> 2.4V
> 2.4V
Low
High
High(after
ENILIM2 is
high without
60µs)
High
High(after
ENILIM1 is
high without
60µs)
High
LDO5
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
LDO3
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
PWM1
OFF
OFF
ON
ON
OFF
ON
ON (after
PWM2 is
POK)
OFF
ON
ON
OFF
ON
ON (after
PWM2 is
POK)
PWM2
OFF
OFF
ON
OFF
ON
ON (after
PWM1 is
POK)
ON
OFF
ON
OFF
ON
ON (after
PWM1 is
POK)
ON
VCLK
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
ON
Copyright © ANPEC Electronics Corp.
16
Rev. A.2 - Sep., 2012
www.anpec.com.tw