Datasheet Texas Instruments UCC28880DR — 数据表

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Design UCC28880
SLUSC05D – JULY 2014 – REVISED MAY 2016 UCC28880 700-V, 100-mA Low Quiescent Current Off-Line Converter
1 Features 2 Applications 1 Integrated Power MOSFET (Switch) Rated to
700-V Drain-to-Source Voltage
Integrated High-Voltage Current Source for
Internal Low-Voltage Supply Generation
Soft Start
Self-Biased Switcher (Start Up and Operation
Directly from Rectified Mains Voltage)
Supports Buck, Buck-Boost and Flyback
Topologies
100 Ојs and cycle-by-cycle is
progressively reduced up to tOFF(min) providing soft start.
7.4.2 Feedback and Voltage Control Loop
The feedback circuit consists of a voltage comparator with the positive input connected to an internal reference
voltage (referenced to GND) and the negative input connected to FB pin. When the feedback voltage at the FB
pin is below the reference voltage VFB_TH logic high is generated at the comparator output. This logic high …