Multi-topology PWM controller with AEC-Q100 grade
The TL3845D is a current-mode PWM controller from Texas Instruments, part of the Automotive AEC-Q100 series. It supports boost, flyback, and forward converter topologies, making it a flexible choice for isolated and non-isolated DC-DC stages in automotive-grade power supplies. Switching at a fixed 100 kHz, the controller delivers a single transistor-driver output with a maximum duty cycle of 48%. The supply range spans 7.6 V to 30 V, and the device operates over a commercial temperature range of 0°C to 70°C.
The tube packaging is typical for prototype and low-volume builds; for reels, check the alternate order codes. The 100 kHz fixed frequency simplifies EMI filter design — the fundamental and its harmonics fall in a predictable band. No clock sync input means the switching frequency cannot be slaved to an external oscillator; plan for a standalone power stage.
Lifecycle and compliance
The commercial temperature range (0°C to 70°C) limits it to ambient or conditioned environments — not suitable for extended high-temp or engine-bay use without thermal analysis.