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FAN5609MPX 데이터시트(PDF) 4 Page - Fairchild Semiconductor |
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FAN5609MPX 데이터시트(HTML) 4 Page - Fairchild Semiconductor |
4 / 11 page FAN5609 PRODUCT SPECIFICATION 4 REV. 1.0.2 5/30/03 Block Diagram Linear Regulator Oscillator Analog Detector Power Good Bandgap Reference Reference D R I V E R S P U M P Voltage Selector 1 µF 1 µF VIN VOUT GND Ref1 Ref3 Ref4 (BG) Regulator Low Battery Ref. Range Selection Mode Change Ref2 5 µF VIN On Off And Current Range DAC A B Circuit Description The FAN5609’s switched capacitor DC/DC converter auto- matically configures its internal switches to achieve high effi- ciency and to provide tightly regulated output currents for the LEDs. An analog detector determines which diode requires the highest voltage in order to sustain the pre-set current levels, and adjusts the pump regulator accordingly. Every diode has its own linear current regulator. In addition, a voltage regulator controls the output voltage when the bat- tery voltage is within a range where linear regulation can provide maximum possible efficiency. If the battery voltage is too low to sustain the diode current in the linear mode, a fractional 3:2 charge pump is enabled. When the battery voltage drops further and this mode is no longer sufficient to sustain proper operation, the pump is automatically reconfig- ured to operate in 2:1 mode. As the battery discharges and the voltage decays, the FAN5609 switches between modes to maintain a constant current through LED throughout the bat- tery life. The transition has hysteresis to prevent toggling. Supply Voltage The internal supply voltage for the device is automatically selected from VIN or VOUT pins, whichever is higher. Soft Start The soft-start circuit limits inrush current when the device is initially powered up and enabled. The reference voltage con- trols the rate of the output voltage ramp-up to its final value. Typical start-up time is 1ms. The rate of the output voltage ramp-up is controlled by an internally generated slow ramp, and an internal variable resistor limits the input current. |
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