The HR1000 is a controller designed specifically for the resonant half-bridge topology. It provides two drive-signal channels that output complementary signals at a 50% duty cycle. An internal fixed dead-time of 350ns between the two complementary gate signals guarantees zero-voltage switching during the transient and enables high-frequency operation. The integrated bootstrap diode simplifies the external driving circuit for the high-side switch. It can withstand up to 600V with immunity against high dV/dt noise. Modulating the switching frequency regulates the topology output voltage. A programmable oscillator can set both the maximum and minimum switching frequencies . The IC starts up at the programmed maximum switching frequency and gradually slows until the control loop takes over to prevent excessive inrush current The IC can be forced to enter a controlled burst-mode operation at light-load to minimize the power consumption and tighten output regulation. Protections features—including latched shutdown, auto-recovery, brown-out protection, and over-temperature protection—improve converter design safety without engendering additional circuit complexity. The IC provide 1.5A/2A source/sink capability for both high-side and low-side gate drivers. The HR1000 is available in a SOIC-16 package.
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