전자부품 데이터시트 검색엔진 |
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FAN5610MPX 데이터시트(PDF) 8 Page - Fairchild Semiconductor |
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FAN5610MPX 데이터시트(HTML) 8 Page - Fairchild Semiconductor |
8 / 10 page FAN5610 PRODUCT SPECIFICATION 8 REV. 1.0.2 10/28/03 Application Examples: Example 1: Drive low VF white or blue LEDs directly from single cell Li-ion When using white or blue low VF LEDs, and utilizing the driver’s low voltage drop, only 3.45V in VIN is needed for the full 20mA LED current. Usually at 3.1V, there is still 5mA current available for the LEDs. The single cell Li-ion is utilized in most applications like cell phones or digital still cameras. In most cases, the Li-ion battery voltage level only goes down to 3.0V voltage level, and not down to the full discharge level (2.7V) before requesting the charger. –VDROP ~ 0.35V –VF (at 20mA) < 3.1V (Low VF) –VIN (at 20mA) =VDROP + VF = 3.45V –VIN (at 5mA Typical) ~ 3.1V Where VIN = Single cell Li-ion Voltage Key advantages: • No boost circuit needed for the LCD or keyboard backlight • Driver directly connected to a Li-ion battery • No EMI, no switching noise, no boost efficiency lost, no capacitor, and no inductor. Example 2: Drive high VF white or blue LEDs from existing bus from 4.0V to 5.5V High VF white or blue LEDs have forward-voltage drop in the range of 3.3V to 4.0V. To drive these LEDs with the max- imum current of 20mA for maximum brightness, usually requires a boost circuit for a single cell Li-ion voltage range. In some cases, there is already a voltage bus in the system, which can be utilized. Due to the low voltage drop of the FAN5610, VIN needs to be only 350mV higher than the voltage VF of LEDs connected to FAN5610. –VDROP ~ 0.35V –VF (at 20mA) = 3.3V to 4.0V (High VF) –VIN(at 20mA) ≥ VDROP + VF = 4.35V(max) Where VIN = Existing bus = 5V Key advantages: • No boost circuit needed for LCD or keyboard backlight • Driver utilizes the existing bus • Low voltage drop provides the full 20mA LED current at the lowest possible voltage level. D1 D2 D3 D4 VIN GND FAN5610 IN A IN B Micro-Controller V IN (Li-Ion) D1 D2 D3 D4 VIN GND FAN5610 IN A IN B Microprocessor I/O V IN (System Bus) |
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