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Power Integrations ClampZero™ Active Clamp ICs pairs with the InnoSwitch™4 family of ICs to eliminate energy wasted due to switching losses in the clamp and primary switch. This combination dramatically improves power supply efficiency, easily exceeding 95%, while maintaining the flyback architecture’s flexibility and low component count.
The Power Integrations ClampZero ICs are an active clamping circuit that recycles otherwise wasted leakage inductance energy. The ClampZero incorporates a high-side power switch and level shifted self-biased controller, which receives communication from a low-side transceiver connected to the InnoSwitch4 primary controller.
Zero-voltage switching is achieved by precise timing between the turn-off of the ClampZero and the turn-on of the InnoSwitch4 power switch, which completely removes turn-on losses. The overall effect of this synchronized switching, along with the InnoSwitch4 PowiGaN switch, is a flyback converter with zero primary clamp and power switching losses. This enables high-density, heatsinkless flyback designs up to 135W.
