Datasheet - UNISONIC TECHNOLOGIES CO LTD U3525 LINEAR INTEGRATED CIRCUIT REGULATING PWM IC DESCRIPTION The UTC U3525 is a pulse width modulator IC

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UNISONIC TECHNOLOGIES CO., LTD U3525 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1of 9 Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-032,A 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 DIP-16 SOP-16 *Pb-free plating product number: U3525L ± ORDERING INFORMATION Order Number Normal Lead Free Plating Package Packing U3525-D16-T U3525L-D16-T DIP-16 Tube U3525-S16-R U3525L-S16-R SOP-16 Tape Reel U3525-S16-T U3525L-S16-T SOP-16 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
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U3525 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 9 www.unisonic.com.tw QW-R103-032,A ± PIN CONNECTIONS (top view) V REF +V I OUTPUT B V C GROUND OUTPUT A SHUT DOWN COMP 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 SOFT-START R T DISCHARGE C T OSC.OUTPUT SYNC N.I.INPUT INV.INPUT ± THERMAL DATA PARAMETER SYMBOL RATING UNIT DIP16 θ JA 80 °C/W Thermal Resistance Junction-ambient SOP-16 θ JA 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.
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U3525 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 9 www.unisonic.com.tw QW-R103-032,A ± BLOCK DIAGRAM 5k Ω 50 μ A 5k Ω PWM EA + - 4 3 6 7 5 9 1 2 B A FLIP/ FLOP 11 12 13 15 8 14 10 O S C I L A T R VREF 16
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U3525 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 9 www.unisonic.com.tw QW-R103-032,A ±
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This note was uploaded on 08/22/2011 for the course EEE 230 taught by Professor Subramanian during the Spring '07 term at University of California, Berkeley.

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Datasheet - UNISONIC TECHNOLOGIES CO LTD U3525 LINEAR INTEGRATED CIRCUIT REGULATING PWM IC DESCRIPTION The UTC U3525 is a pulse width modulator IC

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