TL494CDR PWM Control Circuit for Power Supply Applications
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TL494CDR PWM Control Circuit IC | Integrated Controller for Power Supply Applications
The TL494CDR is a fully-integrated PWM control IC combining all the essential blocks for building pulse-width-modulation power-supply control circuits. The chip integrates two error amplifiers, an adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5V regulator with 5% tolerance, and output control circuitry on a single die.
Selectable push-pull or single-ended output operation, double-pulse inhibition for safe output handling, variable dead-time control over a wide range. The "CDR" suffix denotes SOIC-16 SMD package on tape-and-reel.
When to Replace the TL494CDR
- PSU fails to start — no PWM output to the main switching MOSFETs.
- Erratic PWM behavior — duty cycle wandering, double pulses, dead-time anomalies.
- 5V reference rail dead — internal regulator failed.
- Visible damage on the SOIC-16 package — burnt or cracked.
TL494CDR Specifications
| Parameter | Specification |
|---|---|
| Function | PWM Control IC (all-in-one) |
| Error Amplifiers | 2 internal |
| Oscillator | Adjustable (external RC) |
| Dead-Time Control | Variable, comparator-based |
| Output Configuration | Selectable push-pull or single-ended |
| Output Current Capability | 200mA sink or source |
| Internal Regulator | 5V reference, 5% tolerance |
| Double-Pulse Inhibition | Built-in |
| Package | SOIC-16 ("CDR" suffix, tape-and-reel) |
FAQ — TL494CDR PWM Controller
Q: How do I confirm the TL494CDR is failed?
A: Probe the output pins (pin 9 / pin 10 for push-pull) with a scope while the PSU controller is trying to start. Healthy = clean PWM square waves at the oscillator frequency. No output, stuck-high / stuck-low, or random duty cycle = chip failed. Also verify the 5V reference (pin 14) reads exactly 5V ±5%.
Q: Can I substitute another TL494 variant (TL494CN, TL494IDR)?
A: Electrically yes for the same family. The "C" prefix = commercial temp range (0-70°C), "I" = industrial (-40 to +85°C). Match the package suffix: "N" = DIP-16 through-hole, "DR" = SOIC-16 SMD. Don't mix packages.
Q: Rework profile?
A: Hot air at 320°C with flux paste for SOIC-16 SMD. Through-hole TL494CN variants use standard vacuum desoldering.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.
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PSU repair benches stocking TL494CDR controllers in volume? Email contact@lys-sz.com for tape-and-reel pricing. Worldwide shipping from our Shenzhen warehouse.
Buying in bulk for a mining farm or repair shop?
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