Soft Sw PWM Cntrlr 4-OUT PH SHIFT RES 1.15MHz 28-Pin SOIC T/R

The UC2875 integrated circuit 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 combination with resonant, zero-voltage switching for high efficiency performance at high frequencies. This circuit 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 2 MHz, overall switching frequencies to 1 MHz are practical. In addition to the standard 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 outputs in an active-low state until the supply reaches a 10.75 V threshold. 1.5 V 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 70 ns of a fault. The current-fault circuitry implements full-cycle restart operation. Additional features include an error amplifier with band-width in excess of 7 MHz, a 5 V reference, provisions for soft-starting, and flexible ramp generation and slope compensation circuitry. This device is available in 28-pin "bat-wing" SOIC plastic package for operation over –25°C to +110°C operation.

Controlled Baseline

• One Assembly/Test Site, One Fabrication Site

Extended Temperature Performance of –25°C to 110°C

Enhanced Diminishing Manufacturing Sources (DMS) Support

Enhanced Product Change Notification

Qualification Pedigree

Zero to 100% Duty Cycle Control

Programmable Output Turn-On Delay

Compatible with Voltage or Current Mode Topologies

Practical Operation at Switching Frequencies to 1 MHz

Four 2 A Totem Pole Outputs

10 MHz Error Amplifier

Under-Voltage Lockout

Low Startup Current –150 µA

Outputs Active Low During UVLO

Soft-Start Control

Latched Over-Current Comparator With Full Cycle Restart

Trimmed Reference