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PDF PHY4943D Data sheet ( Hoja de datos )
| Número de pieza | PHY4943D | |
| Descripción | Power Supply Supervisor + PWM | |
| Fabricantes | ETC | |
| Logotipo |  |
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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/
1 page  
www.DataSheet.co.kr
PHY4943D
Block Diagram
Power Supply Supervisor + PWM
Oct, 2009 V1.2
5/9
Datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet PHY4943D.PDF ] | |
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