UCC2583 - 开关模式二次侧后稳压器

UCC2583是TI德州仪器公司的一款PWM与谐振控制器产品，UCC2583是开关模式二次侧后稳压器，本站介绍了UCC2583的封装应用图解、特点和优点、功能等，并给出了与UCC2583相关的TI元器件型号供参考。

UCC2583 - 开关模式二次侧后稳压器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UCC3583 is a synchronizable secondary side post regulator for precision regulation of the auxiliary outputs of multiple output power supplies. It contains a leading edge pulse width modulator, which generates the gate drive signal for a FET power switch connected in series with the rectifying diode. The turn-on of the power switch is delayed from the leading edge of the secondary power pulse to regulate the output voltage. The UCC3583 contains a ramp generator slaved to the secondary power pulse, a voltage error amplifier, a current error amplifier, a PWM comparator and associated logic, a gate driver, a precision reference, and protection circuitry.

The ramp discharge and termination of the gate drive signal are triggered by the synchronization pulse, typically derived from the falling edge of the transformer secondary voltage. The ramp starts charging again once its low threshold is reached. The gate drive signal is turned on when the ramp voltage exceeds the control voltage. This leading edge modulation technique prevents instability when the UCC3583 is used in peak current mode primary controlled systems.

The controller operates from a floating power supply referenced to the output voltage being controlled. It features an undervoltage lockout (UVLO) circuit, a soft start circuit, and an averaging current limit amplifier. The current limit can be programmed to be proportional to the output voltage, thus achieving foldback operation to minimize the dissipation under short circuit conditions.

产品特性

Precision Secondary Side Post Regulation for Multiple Output Power Supplies
Useful for Both Single Ended and Center Tapped Secondary Circuits
Ideal Replacement for Complex Magnetic Amplifier Regulated Circuits
Leading Edge Modulation
Does Not Require Gate Drive Transformer
High Frequency (>500kHz) Operation
Applicable for Wide Range of Output Voltages
High Current Gate Driver (0.5A Sink/1.5A Source)
Average Current Limiting Loop

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