Texas Instruments UC3845ADWTR current-mode PWM controller, 48% max duty cycle, switching up to 500 kHz, 7.6 V to 30 V supply, transistor driver output, 16-SOIC package, 0°C to 70°C.
| Parameter | Value |
|---|---|
| Output type | Transistor Driver |
| Mounting | Surface Mount |
| Voltage - supply (Vcc (Vdd)) | 7.6V ~ 30V |
| Frequency - switching | Up to 500kHz |
| I/O channels | 1 |
| Output phases | 1 |
| Duty cycle | 48% |
| Operating temperature | 0°C~70°C(TA) |
| Package | Tape & Reel (TR) |
| Function | Step-Up, Step-Down, Step-Up/Step-Down |
| Topology | Boost, Buck, Flyback, Forward |
| Clock sync | No |
| Case | 16-SOIC (0.295\", 7.50mm Width) |
| Control features | Frequency Control |
| Output configuration | Positive, Isolation Capable |
| Synchronous rectifier | No |
The UC3845ADWTR: The controller supports boost, buck, and step-up/step-down configurations, and its transistor-driver output drives an external MOSFET through a gate-drive resistor — no integrated power stage.
The oscillator runs up to 500 kHz. The supply range is 7.6 V to 30 V.
Texas Instruments has discontinued this specific tape-and-reel variant.
Yes. The UC3845ADWTR supports boost, buck, flyback, and forward topologies. The 48% maximum duty cycle is well-suited for flyback and forward converters where the transformer reset limits the on-time. For boost converters, the duty cycle ceiling may limit the step-up ratio — check the required duty cycle against the 48% max before committing.