TL494: PWM Controller (up to 200 kHz)
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The TL494 PWM Controller 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 PWM Controller 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. This PWM Controller 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 PWM Controller is characterized for operation from 0C to 70C. The TL494I is characterized for operation from -40C to 85C. The TL494B is characterized for operation from -40C to 125C. The NCV494B is characterized for -40C to 125C and certified for automotive applications.
The TL494 PWM Controller 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. This PWM Controller 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 PWM Controller is characterized for operation from 0C to 70C. The TL494I is characterized for operation from -40C to 85C. The TL494B is characterized for operation from -40C to 125C. The NCV494B is characterized for -40C to 125C and certified for automotive applications.
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Technical Documentation & Design Resources
Application Notes (1) | Package Drawings (2) |
Data Sheets (1) |
Availability & Samples
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Specifications
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Case Outlines
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Intaractive Block Diagram
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Case Outline |
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TL494BDG |
Obsolete ![]() |
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TL494, TA= -40°C to +125°C | SOIC-16 | 751B-05 | 1 | 260 | Tube | 48 | |||||||||
TL494BDR2G | Active |
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TL494, TA= -40°C to +125°C | SOIC-16 | 751B-05 | 1 | 260 | Tape and Reel | 2500 | $0.2652 | ||||||||
TL494CDG |
Obsolete ![]() |
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TL494, TA= 0°C to +70°C | SOIC-16 | 751B-05 | 1 | 260 | Tube | 48 | |||||||||
TL494CDR2G | Active |
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TL494, TA= 0°C to +70°C | SOIC-16 | 751B-05 | 1 | 260 | Tape and Reel | 2500 | $0.2605
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TL494CNG |
Obsolete ![]() |
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TL494, TA= 0°C to +70°C | PDIP-16 | 648-08 | NA | Tube | 500 | ||||||||||
TL494ING |
Obsolete ![]() |
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TL494, TA= -40°C to 85°C | PDIP-16 | 648-08 | NA | Tube | 500 |
Market Leadtime (weeks) | : | Contact Factory |
Market Leadtime (weeks) | : | 17 to 20 |
FutureElectronics (2020-08-19 00:00) | : | >1K |
Market Leadtime (weeks) | : | Contact Factory |
PandS (2020-09-14 00:00) | : | <100 |
Market Leadtime (weeks) | : | Contact Factory |
Market Leadtime (weeks) | : | Contact Factory |
Market Leadtime (weeks) | : | Contact Factory |
Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Phases
Control Mode
VCC Min (V)
VCC Max (V)
fSW Typ (kHz)
Package Type
TL494BDR2G
$0.2652
Pb
A
H
P
Active
Flyback
Forward
Half-Bridge
Push-Pull
Step-Down
Step-Up
1
Voltage Mode
7
40
Up to 200
SOIC-16
TL494CDR2G
$0.2605
Pb
A
H
P
Active
Flyback
Forward
Half-Bridge
Push-Pull
Step-Down
Step-Up
1
Voltage Mode
7
40
Up to 200
SOIC-16
Application
Diagram - Block