TL594 (ACTIVE)

Pulse-Width-Modulation (PWM) Control Circuit

 

Description

The TL594 device incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the systems engineer the flexibility to tailor the power-supply control circuitry to a specific application.

The TL594 device contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator with a precision of 1%, an undervoltage lockout control circuit, and output control circuitry.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, with selection by means of the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The undervoltage lockout control circuit locks the outputs off until the internal circuitry is operational.

Features

  • Complete PWM Power-Control Circuitry
  • Uncommitted Outputs for 200-mA 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 Trimmed to 1%
  • Circuit Architecture Allows Easy Synchronization
  • Undervoltage Lockout (UVLO) for Low-VCC Conditions

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Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
TL594 TL494
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull   
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull   
Voltage    Voltage   
-0.3    -0.3   
38    38   
300    300   
6.1/6    N/A   
45    45   
0.2    0.2   
Adjustable Switching Frequency
Error Amplifier
Multi-topology   
Adjustable Switching Frequency
Error Amplifier
Multi-topology   
Catalog    Catalog   
-40 to 85
0 to 70   
-40 to 85
0 to 70   
16PDIP
16SO
16SOIC
16TSSOP   
16PDIP
16SO
16SOIC
16TSSOP