Product Summary

The UC3875N is a Phase Shift Resonant Controller. It 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. The UC3875N 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).

Parametrics

UC3875N absolute maximum ratings: (1)Supply Voltage (VC, VIN): 20V; (2)Output Current, Source or Sink; (3)DC: ; (4)Pulse (0.5μs): 3A; (5)Analog I/0s: –0.3 to 5.3V; (6)Storage Temperature Range: –65℃ to +150℃; (7)Junction Temperature: –55℃ to +150℃; (8)Lead Temperature (Soldering, 10 sec.): +300℃.

Features

UC3875N features: (1)Zero to 100% Duty Cycle Control; (2)Programmable Output Turn-On Delay; (3)Compatible with Voltage or Current Mode Topologies; (4)Practical Operation at Switching Frequencies to 1MHz; (5)Four 2A Totem Pole Outputs; (6)10MHz Error Amplifier; (7)Undervoltage Lockout; (8)Low Startup Current 150μA; (9)Outputs Active Low During UVLO; (10)Soft-Start Control; (11)Latched Over-Current Comparator With Full Cycle Restart; (12)Trimmed Reference.

Diagrams

UC3875N block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC3875N
UC3875N

Texas Instruments

Soft Switching PWM Controllers Phase Shift Resonant Controller

Data Sheet

0-1: $6.65
1-25: $6.36
25-100: $4.84
100-250: $4.73
UC3875NG4
UC3875NG4

Texas Instruments

Soft Switching PWM Controllers Phase Shift Resonant Controller

Data Sheet

0-1: $6.65
1-25: $5.92
25-100: $4.84
100-250: $4.73