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PDF 3521 Datasheet ( Hoja de datos )

Número de pieza 3521
Descripción PWM CONTROLLER
Fabricantes Unisonic Technologies 
Logotipo Unisonic Technologies Logotipo

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3521 Hoja de datos, Descripción, Manual
UNISONIC TECHNOLOGIES CO., LTD
3521
PWM CONTROLLER WITH
SUPERVISORY CIRCUIT FOR
SWITCHING POWER SUPPLY
CMOS IC
„ DESCRIPTION
UTC 3521 PWM controller is designed for switching mode power
supply for 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 implements.
„ FEATURES
* Over-Voltage Protection for 3.3V, 5V and 12V
* Under-Voltage Detection for 3.3V, 5V and 12V
* Over-Power Protection
* Remote ON/OFF Function
* Power Good Circuitry
* Delay Time for PG Signal
* Delay Time for Over-Voltage and Under-Voltage Protection
* On-Chip Oscillator and Error Amplifier
DIP-16
„ ORDERING INFORMATION
Ordering Number
Lead Free Plating
Halogen Free
3521L-D16-T
3521G-D16-T
Package
DIP-16
Packing
Tube
3521L-D16-T
(1)Packing Type
(2)Package Type
(3)Lead Free
(1) T: Tube
(2) D16: DIP-16
(3) L: Lead Free, G: Halogen Free
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
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3521 pdf
3521
„ FUNCTION DESCRIPTION
(1) REMOTE ON/OFF
REM
REMONF
trem
trem
CMOS IC
REMON
(2) Under Voltage Protection Delay Time
REM
toff
REMONF
trem
toff
UVP
td,uvp
(3) Pulse Width Modulation
The output pulse width modulation is generated by comparison of the saw-tooth waveform from the capacitor CT
to the feedback of the voltage.
Therefore, an increase in feedback control signal amplitude causes a linear decrease of the output pulse width.
(4) 0Protection Control of the Soft-Start
The soft-start function is to reduce the large current surge during power-up or preventing the output voltages
(V33/V5/V12) reaches the Over Voltage Protection level.
(5) The function of PT
This signal is prepared for extra Over Voltage Protection Input (VPT>1.25V) or another Disable Under Voltage
Protection function (VPT<0.62V).
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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