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PHY4943D Datasheet Preview

PHY4943D Datasheet

Power Supply Supervisor+PWM

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www.DataSheet.co.kr
PHY4943D
Power Supply Supervisor + PWM
Features
PC half-bridge (or 494) power supply
supervisor + PWM
High integration & few external components
Over-voltage protection for 3.3V, 5V ,12V and
PT
Under-voltage protection for 3.3V, 5V and 12V
Over-voltage protection for extra voltage input
Power-down warning circuitry
Power good circuitry
Delay time for PSON
280ms PG Time Delay
Remote ON/OFF function
280 ms Time Delay for UVP
On-chip error amplifier
On-chip oscillator ,frequency is adjustable by
external resistor
PWM dead-time control
Soft-start and maximum 90% duty cycle
Compatible with WT7520
Pb-Free DIP-16L Package
Applications
ATX PC power
TFT-LCD-TV
NLX /SFX power
General Description
PHY4943D controller is designed for switching mode
power supply for desktop PCs. It provides all the
functions necessary to monitor and control the
output of the power supply. Remote ON/OFF
control, power good circuitry, some protection
features against over-voltage and over-power are
implemented. It directly senses all the output rails
for OVP without the need of external dividers.
An innovated AC-signal sampling circuitry provides
a sufficient power-down warning signal for PG. A
built-in timer generates accuracy timing for control
circuit including the PS-off delay. The PWM dead-
time control prevents the power transformer from
the saturation and ensures the fastest response for
the short-circuit protection which greatly reduce the
stress for power transistors. Utilizing minimum
number of external components, the PHY4943D
includes all of the functions for push-pull and/or
half-bridge topology, decreasing the production
cost and PCB space, and increasing the MTBF for
power supply
Oct, 2009 V1.2
1/9
Datasheet pdf - http://www.DataSheet4U.net/




ETC

PHY4943D Datasheet Preview

PHY4943D Datasheet

Power Supply Supervisor+PWM

No Preview Available !

www.DataSheet.co.kr
PHY4943D
DIP-16L Package Top-View
Power Supply Supervisor + PWM
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
Pin Name
V33
V5
V12
PT
GND
RT
C1
C2
9 REM
10 SS
11 PG
12 DET
13 VCC
14 OPOUT
15 OPNEGIN
16 VADJ
TYPE
I
I
I
I
P
O
O
O
I
O
O
I
P
O
I
I
FUNCTION
OVP/UVP input for 3.3V.
OVP/UVP input for 5V.
OVP/UVP input for 12V.
Extra OVP protection input.
Ground.
Oscillation frequency set by external resistor.
PWM open drain output 1.
PWM open drain output 2.
Remote on/off input. REM=”low” that means the main SMPS is turned-on.
REM=”high”, the main SMPS is turned-off.
Soft start function set by external capacitor.
Power good signal. PG= ”high” means “power good”.PG= ”low” means
“power fail”.
Extra protection input.
Supply voltage.
OP compensation output.
OP compensation negative input.
OP compensation positive input , feedback voltage sense input.
Oct, 2009 V1.2
2/9
Datasheet pdf - http://www.DataSheet4U.net/


Part Number PHY4943D
Description Power Supply Supervisor+PWM
Maker ETC
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PHY4943D Datasheet PDF






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