UCC3807-3

可编程最大占空比 PWM 控制器

The UCC3807 family of high speed, low power integrated circuits contains all of the control and drive circuitry required for off-line and dc-to-dc fixed frequency current mode switching power supplies with minimal external parts count.

These devices are similar to the UCC3800 family, but with the added feature of a user programmable maximum duty cycle. Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. The UCC3807 family also features internal full cycle soft start and internal leading edge blanking of the current sense input.

The UCC3807 family offers a variety of package options, temperature range options, and choice of critical voltage levels. The family has UVLO thresholds and hysteresis levels for off-line and battery powered systems. Thresholds are shown in the table below.

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User Programmable Maximum PWMDuty Cycle

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100-A Startup Current

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Operation to 1 MHz

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Internal Full Cycle Soft Start

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Internal Leading Edge Blanking of Current Sense Signal

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1-A Totem Pole Output