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UC3875

具有 10.75V/9.25V UVLO、溫度范圍為 0°C 至 70°C 的雙極性相移全橋控制器; ? Zero to 100% Duty Cycle Control\n? Programmable Output Turn-On Delay\n? Compatible with Voltage or Current Mode Topologies\n? Practical Operation at Switching Frequencies to 1MHz\n? Four 2A Totem Pole Outputs\n? 10MHz Error Amplifier\n? Undervoltage Lockout\n? Low Startup Current—150μA\n? Outputs Active Low During UVLO\n? Soft-Start Control\n? Latched Over-Current Comparator With Full Cycle Restart\n? Trimmed Reference;

The UC1875 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 combination 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.\n\n 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).\n\n With the oscillator capable of operation at frequencies in excess of 2MHz, overall switching frequencies to 1MHz 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.\n\n Protective features include an undervoltage lockout which maintains all outputs 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 implements full-cycle restart operation.\n\n Additional features include an error amplifier with band-width in excess of 7MHz, a 5V reference, provisions for soft-starting, and flexible ramp generation and slope compensation circuitry.\n\n These devices are available in 20-pin DIP, 28-pin \"bat-wing\" SOIC and 28 lead power PLCC plastic packages for operation over both 0°C to 70°C and ?25°C to +85°C temperature ranges; and in hermetically sealed cerdip, and surface mount packages for ?55°C to +125°C operation.

UC3875

脈沖寬度調(diào)變控制器;

UC3875

Phase Shift Resonant Controller

UC3875

Phase Shift Reasonant Controller

UC3875L

LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS; UTC proprietary frequency hopping technology for Improved EMI performance.?Lower than 30mW Standby Power DesignDynamic peak current limiting for constant output powerBuilt-in synchronized slope compensationOLP with automatic recoveryOTP and OVP with latch upVDD clamp for higher securityProgrammable frequencyGate output voltage clamped at 16VLow start-up currentCycle-by-cycle Current LimitingUnder voltage lockout (UVLO)Few external components required;

The UTC UC3875L is a high performance current mode PWM controller ideally suited for low standby power. The PWM switching frequency is programmable externally at normal operation. Low VDD startup current make the power reliable on startup design and a large value resistor could be? used in the startup circuit to minimize the standby power. At no? load condition, the IC operates in power-saving mode for lower standby power, decreasingfrequency for Higher conversion efficiency at light load condition. The UTC UC3875L contains protection with automatic recovery including OLP (over load protection), OCP (cycle-by-cycle current limiting), and UVLO (VDD over voltage clamp and under voltage lockout). It also provides the protections including OTP (over temperature protection), OVP (over voltage protection) in UC3875L with latch up. To protect the power MOSFET, Gate-drive output is fixed up to 16V max.?? The internal slope compensation? improves system stability at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch, which offering minimal external component count in the design. Excellent EMI performance is achieved with UTC proprietary frequency hopping technique (ZL201020615247.1) together with soft driver control. Audio noise is eliminated due to switch frequency more than 20kHz during operation. The UTC UC3875L has such applications as: battery charger, power adaptor, set-top box power supplies, ink jet printers, open-frame SMPS.

UC3875A

LOW COST POWER-SAVING MODE PWM CONTROLLER

UC3875AG-D08-T

LOW COST POWER-SAVING MODE PWM CONTROLLER

UC3875AG-S08-R

LOW COST POWER-SAVING MODE PWM CONTROLLER

UC3875AL-D08-T

LOW COST POWER-SAVING MODE PWM CONTROLLER

UC3875AL-S08-R

LOW COST POWER-SAVING MODE PWM CONTROLLER