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PJ494 - Switchmode Pulse Width Modulation Control Circuit

This page provides the datasheet information for the PJ494, a member of the PJ494_Promax Switchmode Pulse Width Modulation Control Circuit family.

Datasheet Summary

Description

The PJ494 is a fixed-frequency pulse width modulation control circuit, incorporating the primary building blocks required for the control of a switching power supply .

(See Figure 1.) An internal-linear sawtooth oscillator is frequescy-programmable by two external components, RT and CT.

Features

  • Complete PWM Power Control Circuitry Uncommitted Outputs for 200mA Sink or Source Current Output Control Selects Single-Ended or Push.
  • Pull Operation Internal Circuitry Prohibits Double Pulse at Either Output Variable Dead-Time Provides Control over Total Range Internal Regulator Provides a Stable 5-V Reference Supply, 5% Circuit Architecture Allows Easy Synchronization OperatingTemperature (Ambient) PJ494CD PJ494CS -2.

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Datasheet Details

Part number PJ494
Manufacturer Promax-Johnton
File Size 711.58 KB
Description Switchmode Pulse Width Modulation Control Circuit
Datasheet download datasheet PJ494 Datasheet
Additional preview pages of the PJ494 datasheet.

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Full PDF Text Transcription

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PJ494 Switchmode Pulse Width Modulation Control Circuit he PJ494 incorporates on a single monolithic chip all the functions required in the construction of a pulsewidth-modulation control circuit. Designed primarily for power supply control, these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to his application. The PJ494 contains an error amplifier, an on-chip adjustable oscillator, a deed-time control comparator, pulse-steering control flip-flop, a 5-volt, 5% precision regulator, and outputcontrol circuits. The error amplifier exhibits a common-mode voltage from –0.3 volts to Vcc –2 volts. The dead-time control comparator has a fixed offset that provides T approximately 5% dead time when externally altered.
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