U3525-D16-T UTC [Unisonic Technologies], U3525-D16-T Datasheet

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U3525-D16-T

Manufacturer Part Number
U3525-D16-T
Description
REGULATING PWM IC
Manufacturer
UTC [Unisonic Technologies]
Datasheet
U3525
REGULATING PWM IC
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.
* 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.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
The UTC U3525 is a pulse width modulator IC and designed for
FEATURES
ORDERING INFORMATION
DESCRIPTION
U3525-S16-R
U3525-D16-T
U3525-S16-T
U3525L-D16-T
Normal
UNISONIC TECHNOLOGIES CO., LTD
Order Number
(1)Packing Type
(2)Package Type
(3)Lead Plating
Lead Free Plating
U3525L-D16-T
U3525L-S16-R
U3525L-S16-T
(1) R: Tape Reel , T: Tube
(2) D16: DIP-16, S16: SOP-16
(3) L: Lead Free Plating , Blank: Pb/Sn
Package
SOP-16
SOP-16
DIP-16
LINEAR INTEGRATED CIRCUIT
*Pb-free plating product number: U3525L
Tape Reel
Packing
Tube
Tube
SOP-16
DIP - 16
QW-R103-032,A
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U3525-D16-T Summary of contents

Page 1

... 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 ORDERING INFORMATION Order Number Normal Lead Free Plating U3525-D16-T U3525L-D16-T U3525-S16-R U3525L-S16-R U3525-S16-T U3525L-D16-T (1)Packing Type (2)Package Type (3)Lead Plating www.unisonic.com.tw Copyright © ...

Page 2

... U3525 PIN CONNECTIONS (top view) INV.INPUT N.I.INPUT OSC.OUTPUT DISCHARGE SOFT-START THERMAL DATA PARAMETER Thermal Resistance Junction-ambient 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 ...

Page 3

... U3525 BLOCK DIAGRAM 5kΩ FLIP/ 4 FLOP UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com. PWM 50μA 5kΩ LINEAR INTEGRATED CIRCUIT VREF 16 QW-R103-032 ...

Page 4

... U3525 ABSOLUATE MAXIUM RATINGS PARAMETER Supply Voltage Collector Supply Voltage Oscillator Charging Current Output Current, Source or Sink Reference Output Current Current through C Terminal T Logic Inputs Analog Inputs Total Power Dissipation at Ta=70 °C Junction Temperature Operating Ambient Temperature Storage Temperature Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. ...

Page 5

... U3525 ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER ERROR AMPLIFIER SECTION (V CM Output Low Level Output High Level Input Offset Voltage Input Bias Current Input Offset Current Comm. Mode Reject. Supply Voltage Rejection DC Open Loop Gain DC Transconduct. (Note 1, 3) Gain Bandwidth Product (Note 1) PWM COMPARATOR ...

Page 6

... C T 0.1μ V/I METER (+) = 2 3 (-) = 3 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw CLOCK 4 SYNC DEAD TIME UTC 7 U3525 100Ω 5 COMP 1nF 10kΩ 0.01μ LINEAR INTEGRATED CIRCUIT +V1 15 0.1μ 0.1μF OUTA 11 1KΩ 1W 1KΩ ...

Page 7

... U3525 APPLICATION INFORMATION AND CIRCUIT SHUTDOWN OPTIONS (see Block Diagram) Since both the compensation and soft-start terminals (Pins 9 and 8) have current source pull-ups, either can readily accept a pull-down signal which only has to sink a maximum of 100µA to turn off the outputs. This is subject to the added requirement of discharging whatever external capacitance may be attached to these pins ...

Page 8

... U3525 APPLICATION INFORMATION AND CIRCUIT(Cont.) OUTPUT CIRCUIT (1/2 CIRCUIT SHOWN) +V REF Q3 5KΩ CLOCK F/F ERROR AMPLIFIER INV 1 Q1 INPUT INPUT 200μA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com. Q10 10KΩ 10KΩ PWM + 100μA ...

Page 9

... U3525 TYPICAL CHARACTERISTICS Oscillator Charge Time vs 100 2005001ms T (μs) Output Saturation Characteristics 3 V =20V IN Tamb=25℃ 2 SOURCE SAT,V 1 SINK SAT 0.1 0.01 I (A) OUT UTC assumes no responsibility for equipm ent failures that result from using products at values that ...

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