SY8751

Application Note: SY8751 High Efficiency, 5-80V Input, 500kHz White LED Driver Preliminary Specification General Description SY8751 is a high efficiency, 5V-80V wide input voltage range DC/DC regulator targeting at LED applications. The device integrates the low RDS(ON) MOSFET and internal compensation.SY8751 supports analog dimming with PWM signal/Analog signal. Ordering Information SY8751 □(□□)□ Ordering Number SY8751FCC Tempera ture Code Packa ge Code Optiona l Spec Code Package type SO8E Note ---- Typical Applications Features  Wide input range: 5-80 V  500kHz switching frequency  Integrated low RDS(ON) FET  Analog dimming with PWM signal/Analog signal  Maximum output LED current 1.2A  Compact package: SO8E Applications  LED lighting Figure 1. Schematic diagram AN_SY8751 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 1 Pinout (top view) SY8751 SO8E Top Mark: BJAxyz (device code: BJA, x=year code, y=week code, z= lot number code) Pin Name SEN IN TM GND LX EN CF S08E 1 2 3 4 5,6 7 8 Pin Description Negative Current Sense Pin. Input pin. Decouple this pin to GND pin with 1uF ceramic cap. Also used as the positive current sense pin. Connect to GND Ground pin Inductor node. Enable pin and PWM dimming input pin. Connect a capacitor from this pin to ground to filter out the AC ripple on reference voltage. Or add 0~1.1V on this pin directly to realize linear dimming. Block Diagram IN SEN Current Sense Control Logic EN PWM Dimming 5...