Product Summary

The TL494 is a pulse-width-modulation control circuit. It 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, the TL494 offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494 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. It provides for push-pull or single-ended output operation, which can be selected through the output-control function.

Parametrics

TL494 absolute maximum ratings: (1)VCC Supply voltage: 41 V MAX; (2)VI Amplifier input voltage: VCC + 0.3 V max; (3)VO Collector output voltage: 41 V max; (4)IO Collector output current: 250 mA max; (5)θJA Package thermal impedance:D package: 73℃/W max; DB package℃/W max: 82; N package 67℃/W max; NS package: 64℃/W max; PW package: 108℃/W max; (6)Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: 260 ℃ max; (7)Tstg, Storage temperature range: –65 to 150℃.

Features

TL494 features: (1)Complete PWM Power-Control Circuitry; (2)Uncommitted Outputs for 200-mA Sink or Source Current; (3)Output Control Selects Single-Ended or Push-Pull Operation; (4)Internal Circuitry Prohibits Double Pulse at Either Output; (5)Variable Dead Time Provides Control Over Total Range; (6)Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance; (7)Circuit Architecture Allows Easy Synchronization.

Diagrams

TL494 circuit diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
TL494
TL494
Other

Data Sheet
Negotiable 
TL494BD
TL494BD
ON Semiconductor
Voltage Mode PWM Controllers 40kHz 200mA PWM
Data Sheet
Negotiable 
TL494BDG
TL494BDG
ON Semiconductor
Voltage Mode PWM Controllers 40kHz 200mA PWM w/48% Duty Cycle Max
Data Sheet
0-1: $0.84
1-25: $0.67
25-100: $0.59
100-500: $0.46
TL494BDR2
TL494BDR2
ON Semiconductor
Voltage Mode PWM Controllers 40kHz 200mA PWM
Data Sheet
Negotiable 
TL494BDR2G
TL494BDR2G
ON Semiconductor
Voltage Mode PWM Controllers 40kHz 200mA PWM w/48% Duty Cycle Max
Data Sheet
0-1: $0.50
1-25: $0.39
25-100: $0.34
100-500: $0.25
TL494CD
TL494CD
Texas Instruments
Voltage Mode PWM Controllers PWM Controller
Data Sheet
0-1: $0.35
1-25: $0.31
25-100: $0.24
100-250: $0.24
TL494CDBR
TL494CDBR
Texas Instruments
Voltage Mode PWM Controllers Control Circuit
Data Sheet
Negotiable 
TL494CDBRE4
TL494CDBRE4
Texas Instruments
Voltage Mode PWM Controllers Control Circuit
Data Sheet
Negotiable