HY7700S8R

Description HY7700 is a PWM high-efficiency LED driver controller IC. It allows efficient operation of High Brightness （HB） LED(s) from voltage sources ranging from 9VDC up to 450VDC. HY7700 controls an external MOSFET at variable switching frequency up to 300 kHz. The constant off-time can be programmed using a single resistor. The LED string is driven at constant current rather than constant voltage, thus providing constant light output and enhanced reliability. The output current can be programmed between a few milliamps and up to more than 1.0A . Typical Applications Circuit HY7700 High Brightness LED Driver Features n >90% efficiency. n 9V to 450V input Range. n Constant Current LED driver. n More than 1.0A output applications. n PWM Low-Frequency Dimming via Enable pin. n Input Voltage Surge ratings up to 450V. Applications n DC/DC LED Driver Application. n RGB backlighting LED driver. n Back lighting of flat panel displays. n LED Lighting Application n Automotive LED Lighting Application. Copyright © 2009 Oristreak Ltd., HTTP://WWW.ORISTREAK.COM -1- HY7700 V1.0 HY7700 High Brightness LED Driver Marking Information & Pin Configuration RT LD VDD EN 87 65 HY7700 AYYWW A : Assembly Location YY : Year WW : Weekly 12 34 VIN CS GND DRV Pin Definition PIN NUMBER 1 2 3 4 5 6 7 8 PIN SYMBOL VIN CS GND DRV EN VDD LD RT PIN DESCRIPTION Power Supply Output current set input. Connect a resistor from CS to GND to set the LED bias current. ILED = 0.25 / RSE Ground Ou...