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| EUP9287 ds9287 ver1.0 june 2015 1 constant-voltage, constant-current controller with primary-side regulation description the EUP9287 is a constant-voltage (cv) and constant-current (cc) regulator controller with primary side regulation. the device can control the output voltage and current by sensing auxiliary winding voltage. EUP9287 operates in pulse width modulation mode (pwm) or pulse frequency modulation mode (pfm) automatically to keep the conversion efficiency hig h across the line ranges. the EUP9287 contains thermal shutdown function, over-voltage protection and over-current protection . typical application circuit features <30mw no-load power. 5% voltage and current regulation primary side regulation(psr) without opto-coupler ultra-low start-up current v in _ovp protection fast dynamic load response. clamped gate-driver output for mosfet programmable cable compensation. 1khz ~ 100khz switching frequency tiny external components available in sot23-6 package rohs compliant and 100% lead (pb)-free halogen-free applications adapters for consumer electronics. ac and dc power figure 1. typical application
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