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FAN5606DMPX Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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FAN5606DMPX Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 9 page FAN5606 PRODUCT SPECIFICATION 4 REV. 1.0.3 1/7/05 COIL DRIVER DBB START-UP POWER GOOD LINEAR REGULA TOR OSC REF DAC BG V IN V OUT GND B A CAT IND AMPLIFIER Block Diagram Circuit Description When the input voltage is connected to VIN pin, the system is turned on, the bandgap reference acquires its nominal volt- age and the soft-start cycle begins. Once "power good" is achieved (0.5mA in the diodes), the soft-start cycle stops and the boost voltage increases to generate the desired current selected by the input control pins. The FAN5606 DC/DC converter automatically adjusts its internal duty cycle to achieve high efficiency. If the output external capacitor is shorted, the Schottky diode can be dam- aged, therefore such a condition should be avoided. LED Brightness Control The inputs A and B can be digitally controlled LOW (GND) and HIGH (VCC) signals. In analog mode, A input is con- nected to an external stable voltage source via an external resistor and B input is connected to ground. The current flowing through the resistor is scaled by a factor of approxi- mately 1000. Digital Control The FAN5606’s digital decoder allows selection of the fol- lowing modes of operation: OFF, 5mA, 10mA, 20mA per branch. Analog Control with PWM In analog control mode, the LED current can go up to 25mA. Input A is used to control the LED currents. Input B should be connected to GND (logic level "0"). An external resistor (R) is connected from A to a stable voltage source (VEXTER- NAL) to control the LED current, ILED. The ILED is given by the formula or the graph below: A 0101 B 0011 ILED OFF 5mA 10mA 20mA I LED V External V Ref – R ----------------------------------------- Multiplication Ratio × = |
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