Multi-topology PWM controller for non-isolated and flyback supplies
Control features include dead-time control and frequency control, allowing fine adjustment of the switching waveform to manage EMI or optimize the power stage. The part is packaged in an 8-SOIC, a standard surface-mount footprint that suits automated assembly and rework. Operating temperature is rated from -20°C to 85°C, making it suitable for commercial and industrial environments but not extended-temperature or under-hood automotive applications.
Switching frequency range — design trade-off
The TL5001ACDR's switching frequency spans 20kHz to 500kHz, set by an external resistor and capacitor on the frequency-control pin. At the low end, 20kHz keeps switching losses minimal but may push audible noise into the transformer or inductor core — a concern in audio-adjacent or silent-environment equipment. At 500kHz, the magnetics shrink significantly, but gate-drive losses and switching-edge ringing demand careful layout. The 100% duty-cycle capability means the controller can run near dropout in boost mode, useful when the input voltage sags close to the output target.
Lifecycle and sourcing note
The TL5001ACDR carries an Active lifecycle status per the manufacturer, with ROHS3 compliance.
Design considerations for boost and flyback converters
The TL5001ACDR supports boost topology. In flyback mode, the 100% duty cycle allows the controller to run the transformer at maximum on-time.