U3525 IC Datasheet

U3525 Datasheet, PDF, Equivalent


Part Number

U3525

Description

REGULATING PWM IC

Manufacture

UTC

Total Page 9 Pages
Datasheet
Download U3525 Datasheet


U3525
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
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


Features UNISONIC TECHNOLOGIES CO., LTD U3525 REG ULATING PWM IC DESCRIPTION The UTC U352 5 is a pulse width modulator IC and des igned for switching power supplies appl ication to improve performance and redu ce external parts usage. A shutdown ter minal controls both the soft-start circ uitry 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 NO R logic, giving a LOW output for an OFF state. An under-voltage lockout circui try, which keeps the outputs off and th e soft-start capacitor discharged for s ub-normal input voltages, includes appr oximately 500 mV of hysteresis for jitt er free operation. The PWM circuits als o feature a latch following the compara tor. When a PWM pulses has been termina ted, the outputs will remain off for th e duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking i.
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