TL494 PWM Controller | TI.com

TL494 (ACTIVE)

PWM Controller

 

Description

The TL494 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 flexibility to tailor the power-supply control circuitry to a specific application.

The TL494 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, 5%-precision regulator, and output-control circuits.

The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 device provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.

The TL494C device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.

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 With 5% Tolerance
  • Circuit Architecture Allows Easy Synchronization

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Parametrics Compare all products in PWM controllers & resonant controllers

 
Topology
Control Method
VCC (Min) (V)
VCC (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
TL494 SG2524 SG3524 TL594
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Voltage     Voltage     Voltage     Voltage    
7     8     8     7    
40     40     40     40    
300     722     722     300    
N/A     N/A     N/A     6.1/6    
45     45     45     45    
0.2     0.05     0.05     0.2    
Adjustable Switching Frequency
Dead Time Control
Error Amplifier
Multi-topology    
Adjustable Switching Frequency
Error Amplifier
Multi-topology    
Adjustable Switching Frequency
Error Amplifier
Multi-topology    
Adjustable Switching Frequency
Dead Time Control
Error Amplifier
Multi-topology    
Catalog     Catalog     Catalog     Catalog    
-40 to 85
0 to 70    
-25 to 85     0 to 70     -40 to 85
0 to 70    
16PDIP
16SO
16SOIC
16TSSOP    
16PDIP
16SOIC    
16PDIP
16SO
16SOIC    
16PDIP
16SO
16SOIC
16TSSOP