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2 / 10 page UC3842B/3843B LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 2 of 10 www.unisonic.com.tw QW-R103-012.E PIN CONFIGURATION 1 2 3 4 8 7 6 5 VCC OUTPUT CS RTCT VREF COMP VFB GND PIN DESCRIPTIONS PIN NO. PIN NAME I/O DESCRIPTION 1 COMP O Error amp output to provide loop compensation maintaing VFB at 2.5V 2 VFB I Error amp inverting input, The non-inverting input of error amp is 2.5V band gap reference 3 CS I Current sense input to PWM control gate drive of output 4 RTCT I To set oscillator frequency and maximum output duty cycle 5 GND Power ground 6 OUTPUT O To direct drive power MOSFET 7 VCC Power supply 8 VREF O 5V regulated output provides charging current for CT through RT BLOCK DIAGRAM |
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