product overview NCP1565: pwm controller, highly integrated dual-mode active clamp for complete documentation, see the data sheet product description the NCP1565 is a highly integrated dual-mode active-clamp pwm controller targeting next-generation high-density, high- performance and small to medium power level isolated dc-dc converters for use in telecom and datacom industries. it can be configured in either voltage mode control with input voltage feed-forward or peak current mode control. peak current mode control may be implemented with input voltage feed forward as well. adjustable adaptive overlap time optimizes system efficiency based on input voltage and load conditions. this controller integrates all the necessary control and protection functions to implement an isolated active clamp forward or asymmetric half-bridge converter. it integrates a high-voltage startup bias regulator. the NCP1565 has a line undervoltage detector, cycle-by-cycle current limiting, line voltage dependent maximum duty ratio limit, and programmable overtemperature protection using an external thermistor. it also includes a dual-function fltsd pin used for communicating the presence of a fault but also for shutting down the controller. for complete datasheet please contact your local on semiconductor sales office or tim.kaske@onsemi.com features benefits ? both voltage mode control and current mode control ? flexible topology solution ? line feedforward ? stable constant crossover across input voltage range ? adaptive overlap time control ? extended zvs across input & output operating conditions ? integrated 200v hv startup ? lossless startup and reduced vcc capacitor via dynamic startup ? programmable line undervoltage lockout (uvlo) with adjustable hysteresis ? safely limits operating input voltage range ? cycle by cycle peak current limiting ? increased converter robustness ? overcurrent protection based on average current ? precise output power limit ? programmable duty ratio clamp ? efficiently prevents transformer saturation ? programmable soft-start ? lowers components stress at startup ? programmable shutdown and restart delays ? robustness and flexibility of design applications end products ? high efficiency isolated dc?dc converters ? telecom systems ? server power supplies ? servers ? 24 v and 48 v telecom systems ? 42 v automotive applications part electrical specifications product compliance status topolog y control mode fsw typ (khz) stand- by mode uvlo (v) short circuit protecti on latch soft start vcc max (v) drive cap. (ma) packag e type NCP1565mntxg pb-free halide free productpre view forward current/ voltage mode up to 1.5 mhz yes yes yes yes yes 20 v 2000 / 3000 qfn-24
application diagram for more information please contact your local sales support at www.onsemi.com created on: 9/17/2014
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