HomedatasheetCA1524F

CA1524F Datasheet

Regulating Pulse Width Modulator
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Description

Features, Applications

Description

The CA1524 and CA3524 are silicon monolithic integrated circuits designed to provide all the control circuitry for use in a broad range of switching regulator circuits. The CA1524 and CA3524 have all the features of the industry types SG1524, SG2524, and SG3524, respectively. A block diagram of the CA1524 series is shown in Figure 1. The circuit includes a zener voltage reference, transconductance error amplifier, precision R-C oscillator, pulse-width modulator, pulse-steering flip-flop, dual alternating output switches, and current-limiting and shutdown circuitry. This device can be used for switching regulators of either polarity, transformer-coupled dc-dc converter, transformerless voltage doublers, dc-ac power inverters, highly efficient variable power supplies, and polarity converter, as well as other power-control applications.

Features

Complete PWM Power Control Circuitry Separate Outputs for Single-Ended or Push-Pull Operation Line and Load Regulation. 0.2% (Typ) Internal Reference Supply with 1% (Max) Oscillator and Reference Voltage Variation Over Full Temperature Range Standby Current of Less Than 10mA Frequency of Operation Beyond 100kHz Variable-Output Dead Time to 5�s Low VCE(sat) Over the Temperature Range

Applications

Positive and Negative Regulated Supplies Dual-Output Regulators Flyback Converters DC-DC Transformer-Coupled Regulating Converters Single-Ended DC-DC Converters Variable Power Supplies

PART NUMBER CA3524E CA3524F TEMPERATURE RANGE +125oC +70oC PACKAGE 16 Lead Plastic DIP 16 Lead CerDIP 16 Lead Plastic DIP 16 Lead CerDIP 16 Lead Plastic DIP 16 Lead CerDIP

INV. INPUT NONINV. INPUT OSC OUT C.L. SENSE C.L. SENSE RT CT GND VREF V+ EMITTER B COLLECTOR B COLLECTOR A EMITTER A SHUTDOWN COMPENSATION AND COMPARATOR

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Copyright � Intersil Corporation 2000

REFERENCE REGULATOR +5V TO ALL INTERNAL CIRCUITS +5V 16 VREF FLIP FLOP 3 OSC OUT +5V OSCILLATOR CT 1 INV. INPUT 2 NON-INV. INPUT 10 9 SHUTDOWN 10k COMPENSATION AND COMPARATOR ERROR AMP + +5V COMPARATOR +5V + C.L. 5 - SENSE CA 12

Input Voltage (Between VIN and GND Terminals). 40V Operating Voltage Range (VIN to GND). to 40V Output Current Each Output: (Terminal 14). 100mA Output Current (Reference Regulator). 50mA Oscillator Charging Current. 5mA

Thermal Resistance JA Plastic DIP Package. 100oC/W Device Dissipation +25oC. 1.25W Above = +25oC.Derate Linearly at 10mW/oC Operating Temperature Range. to +125oC Storage Temperature Range. to +150oC Lead Temperature (During Soldering) At distance 1/16 � in. (1.59mm �0.79mm) from case for 10s Max. +265oC

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

= 20kHz, Unless Otherwise Stated. CA1524, CA2524 PARAMETER REFERENCE SECTION Output Voltage Line Regulation Load Regulation Ripple Rejection Short Circuit Current Limit Temperature Stability Long Term Stability OSCILLATOR SECTION Maximum Frequency Initial Accuracy Voltage Stability Temperature Stability Output Amplitude Output Pulse Width (Pin 3) Ramp Voltage Low (Note 1) Ramp Voltage High (Note 1) Capacitor Charging Current Range Timing Resistance Range Charging Capacitor Range Dead Time Expansion Capacitor on Pin 3 (when a small osc. cap is used) ERROR AMPLIFIER SECTION Input Offset Voltage Input Bias Current Open Loop Voltage Gain Common Mode Voltage Common Mode Rejection Ratio Small Signal Bandwidth = 25oC



Features

Parameters

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