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U3525 반도체 회로 부품 판매점

REGULATING PWM IC



Unisonic Technologies 로고
Unisonic Technologies
U3525 데이터시트, 핀배열, 회로
UNISONIC TECHNOLOGIES CO., LTD
U3525
LINEAR INTEGRATED CIRCUIT
REGULATING PWM IC
DESCRIPTION
The UTC U3525 is a pulse width modulator IC and designed for
switching power supplies application to improve performance and
reduce external parts usage.
A shutdown terminal controls both the soft-start circuitry and the
output stages, providing instantaneous turn off through the PWM
latch with pulsed shutdown, as well as soft-start recycle with longer
shutdown commands. The output stage features NOR logic, giving
a LOW output for an OFF state. An under-voltage lockout circuitry,
which keeps the outputs off and the soft-start capacitor discharged
for sub-normal input voltages, includes approximately 500 mV of
hysteresis for jitter free operation. The PWM circuits also feature a
latch following the comparator. When a PWM pulses has been
terminated, the outputs will remain off for the duration of the period.
The latch is reset with each clock pulse. The output stages are
totem-pole designs capable of sourcing or sinking in excess of
200mA.
FEATURES
* Input Voltage: 8~35V
* On-chip +5.1V reference is trimmed to ±1%
* 100HZ ~ 500KHZ oscillator range
* Separate oscillator sync terminal
* Adjustable dead time control
* Internal soft-start
* Pulse-by-pulse shutdown
* Input under-voltage lockout with hysteresis
* Latching PWM to prevent multiple pulses
* Dual source/sink output drivers
www.DataSheet4U.com
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
U3525-D16-T
U3525L-D16-T
U3525-S16-R
U3525L-S16-R
U3525-S16-T
U3525L-S16-T
Package
DIP-16
SOP-16
SOP-16
SOP-16
DIP- 16
*Pb-free plating product number: U3525L
Packing
Tube
Tape Reel
Tube
U3525L-D16-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) D16: DIP-16, S16: SOP-16
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
1of 9
QW-R103-032,A


U3525 데이터시트, 핀배열, 회로
U3525
PIN CONNECTIONS (top view)
LINEAR INTEGRATED CIRCUIT
INV.INPUT
N.I.INPUT
SYNC
OSC.OUTPUT
CT
RT
DISCHARGE
SOFT-START
1
2
3
4
5
6
7
8
16 VREF
15 +VI
14 OUTPUT B
13 VC
12 GROUND
11 OUTPUT A
10 SHUT DOWN
9 COMP
THERMAL DATA
PARAMETER
SYMBOL
RATING
UNIT
Thermal Resistance Junction-ambient
DIP16
SOP-16
θJA
θJA
80 °C/W
50 °C/W
Note:Thermal resistance junction-alumina with the device soldered on the middle of an alumina supporting
substrate measuring 15×20 mm; 0.65 mm thickness with infinite heat sink.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 9
QW-R103-032,A




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REGULATING PWM IC - Unisonic Technologies