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WT7520 Datasheet Download - Weltrend

Номер произв WT7520
Описание PC Power Supply PWM Cupervisor
Производители Weltrend
логотип Weltrend логотип 


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WT7520 Даташит, Описание, Даташиты
www.DataSheet4U.com
Weltrend Semiconductor, Inc.
WT7520
PC POWER SUPPLY PWM SUPERVISOR
Data Sheet
REV. 0.9
February 21, 2005
The information in this document is subject to change without notice.
©Weltrend Semiconductor, Inc. All Rights Reserved.
2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419
Email:support@weltrend.com.tw







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WT7520 Даташит, Описание, Даташиты
www.DataSheet4U.com
WT7520
Data Sheet Rev. 0.90
GENERAL DESCRIPTION
The WT7520 is a pulse–width modulation (PWM) control circuit with complete protection circuits for used
in the SMPS (Switched Mode Power Supply). It contains various functions, which are Over Voltage
Protection, Under Voltage Protection, Power Good Output (PGO), Remote On/Off control and etc. It can
minimize external components of switching power supply systems in personal computer.
Over Voltage Protection (OVP) monitors 3.3V, 5V, 12V and PT input voltage level. Under Voltage
Protection (UVP) monitors 3.3V, 5V and 12V input voltage level. Power Good Output monitors the voltage
level of power supply.
FEATURES
Complete PWM Control and Protection Circuitry
Over Voltage Protection for 3.3V / 5V / 12V / PT
Under Voltage Protection for 3.3V / 5V / 12V
280ms PG Time Delay
Power Good Output is Open Drain Output
PWM Control Output are Open Drain Output
280 mS Time Delay for UVP
Remote ON/OFF function De–bounce Time
Soft-Start function built-in
16–Pin Dual In–line Package
PIN CONFIGURATION
V33
V5
V12
PT
GND
RT
C1
C2
7520
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
VADJ
OPNEGIN
OPOUT
VCC
DET
PG
SS
REM
Ordering Number
WT7520
Package Type
DIP 16
Weltrend Semiconductor, Inc.
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WT7520 Даташит, Описание, Даташиты
www.DataSheet4U.com
WT7520
Data Sheet Rev. 0.90
PIN DESCRIPTION
Pin No.
1 V33
2 V5
3 V12
4 PT
5 GND
6 RT
7 C1
8 C2
9 REM
Pin Name
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.
*The difference between WT7905 and WT7520
ITEM
WT7905
Pin-6
CT; external capacitor
(PWM frequency)
Pin-10
TPG; external capacitor
(PG delay-time function)
OVP-3.3V,5V,12V 100us (Typ.)
UVP-3.3V,5V,12V 100us (Typ.)
Soft-Start function
Set by internal circuit
Pin-4
(PT)
PT default 0.8V (with internal
voltage divided resistors)
WT7520
RT; external resistor
(ex. 120k )
SS; external capacitor
(Soft-start function)
510us (Typ.)
110us (Typ.)
Set by external capacitor
(Pin-10:SS)
PT default 0.8V. (with internal
voltage divided resistors)
(24K+4.6K)
Weltrend Semiconductor, Inc.
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