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Texas Instruments TL494CNS — Power Management (PMIC / Gate Driver)

TL494CNS PWM Controller, 1kHz–300kHz, 7V–40V, 16-SOIC

MPNTL494CNS
Active

Texas Instruments TL494CNS, PWM controller, Step-Up/Step-Down/Step-Up/Step-Down, Buck/Boost/Flyback/Forward/Half-Bridge/Push-Pull, 1kHz~300kHz, 7V~40V, 45% duty cycle, 2 outputs, 16-SOIC, Tube.

$1.1100Ref. price · indicative, final on quote
Texas Instruments TL494CNS datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL494CNS specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))7V ~ 40V
Frequency - switching1kHz ~ 300kHz
I/O channels2
Output phases1
Duty cycle45%
Operating temperature0°C~70°C(TA)
PackageTube
FunctionStep-Up, Step-Down, Step-Up/Step-Down
TopologyBuck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Clock syncNo
Case16-SOIC (0.209\", 5.30mm Width)
Control featuresDead Time Control, Frequency Control
Output configurationPositive
Synchronous rectifierNo

Product details

Multi-topology PWM controller for isolated and non-isolated supplies

The TL494CNS is a fixed-frequency PWM controller that handles step-up, step-down, and step-up/step-down topologies including buck, boost, flyback, forward converter, half-bridge, and push-pull configurations.

At 45% max duty cycle per output, the TL494CNS cannot exceed a 45% on-time in a single-ended topology. In push-pull or half-bridge, the two outputs interleave to achieve effective 90% duty cycle at the transformer primary. The 1 kHz to 300 kHz range lets you run at lower frequencies for through-hole magnetics or push higher for smaller planar transformers. The RT/CT timing components set the oscillator; no external clock sync is available. Dead-time control (pin 4) allows fine adjustment of the off-time between output pulses, critical for avoiding shoot-through in half-bridge and push-pull stages.

The supplier device package is 16-SO. The shipping medium is Tube — not Tape & Reel — so plan for tube-to-feeder conversion if your pick-and-place line expects reels. Confirm the tube quantity against your batch size to avoid line splits.

Frequently asked questions

Can TL494CNS be used in a buck converter?

Yes. The TL494CNS supports buck topology, along with boost, flyback, forward converter, half-bridge, and push-pull. For a buck converter, the 45% max duty cycle limits the step-down ratio — the output voltage cannot exceed 45% of the input voltage in a single-ended buck.

What is the maximum duty cycle of TL494CNS?

45% maximum duty cycle per output. In push-pull or half-bridge configurations, the two outputs interleave to achieve an effective 90% duty cycle at the transformer primary.

What is the difference between TL494CNS and TL494CD?

Both are TL494 PWM controllers from Texas Instruments. The TL494CNS ships in a 16-SOIC package (0.209" body width) in Tube form, while the TL494CD is the same die in a 16-SOIC package but typically supplied in Tape & Reel. Functionally identical — the difference is the shipping medium and possibly the reel quantity. Confirm the package code suffix (NS vs D) against your BOM's preferred supplier packaging.