UC3875N Datasheet

Switching Controllers


The UC3875N family of integrated circuits implements control of a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other, allowing constant frequency pulse-width modulation in combi-nation with resonant, zero-voltage switching for high efficiency performance at high frequencies. This family of circuits may be configured to provide control in either voltage or current mode operation, with a separate over-current shutdown for fast fault protection. A programmable time delay is provided to insert a dead-time at the turn-on of each output stage. This delay, providing time to allow the resonant switching action, is independently controllable for each output pair (A-B, C-D). With the oscillator capable of operation at frequencies in excess of 2MHz,overall switching frequencies to 1MHz are practical. In addition to the stan-dard free running mode, with the CLOCKSYNC pin, the user may configure these devices to accept an external clock synchronization signal, or may lock together up to 5 units with the operational frequency determined by the fastest device.Protective features include an undervoltage lockout which maintains all out-puts in an active-low state until the supply reaches a 10.75V threshold.1.5V hysteresis is built in for reliable, boot-strapped chip supply.Over-current protection is provided, and will latch the outputs in the OFF state within 70nsec of a fault. The current-fault circuitry implementsfull-cycle restart operation. UC3875N Features• Zero to 100% Duty Cycle Control• Programmable Output Turn-On Delay• Compatible with Voltage or Current Mode Topologies• Practical Operation at Switching Frequencies to 1MHz• Four 2A Totem Pole Outputs• 10MHz Error Amplifier• Undervoltage Lockout• Low Startup Current –150μA• Outputs Active Low During UVLO• Soft-Start Control• Latched Over-Current Comparator With Full Cycle Restart• Trimmed Reference


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Manufacturer information


Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog and Flash-IP solutions, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.

Microchip Technology Inc. has acquired Atmel.

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