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FAN7544N Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN7544N Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 14 page ©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.0 Features • Low Start-up and Operating Current : 140 µA, 6.5mA • Under Voltage Lock Out With 1.9V of Hysteresis • 600mA of Totem Pole Output with High State Clamp • Trimmed 1.5% Internal Bandgap Reference • Programmable Preheat Time & Frequency • Programmable Run Frequency • High Accuracy Oscillator Descriptions The FAN7544 provides simple and high performance elec- tronic ballast control functions. The FAN7544 is optimized for electronic ballast requiring a minimum board area, by reducing component counts and lowering power dissipation. The features include programmable preheating time and fre- quency and programmable run frequency. The initial pre- heating time and frequency can be adjusted according to the types of lamps using the CPH, CT and RPH. Output gate driver circuit clamps power MOSFET gate voltage to the supply voltage. Internal Block Diagram FAN7544 Simple Ballast Controller 8-DIP 8-SOP 1 1 GND Latch 1.9V CPH Vcc RPH RT OUT1 UVLO 11.6V 1 3 6 4 7 Vcc Vcc Frequency Divider Q 2 5.2V 1.5V Oscillator 6.25Ict Ict Irt=Vref/Rt CT OUT2 Iph=Vref/Rph Current Source Current Source 2.9V 2.9V Irt 5V Iph - Irt 1 2.1 5V 2V Shutdown signal + − Bias Current 9V Vsup TSD + − VCPH 5V 8 Vz 5 R Q S Q R S |
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