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SP7612AEC6-L Datasheet(PDF) 9 Page - Sipex Corporation |
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SP7612AEC6-L Datasheet(HTML) 9 Page - Sipex Corporation |
9 / 14 page Apr20-07 RevS SP7611A/7612A/7614A Low Dropout Linear LED driver 2007 Sipex Corporation Page 9 applications. Any of the SP761X series of LED drivers can be used in the applications presented in this document, due to their similar operation. 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 3.4V VIN is needed for the full 20mA LED current. At 3.1V, there is still 5mA of typical current available for the LEDs. The single cell Li-Ion battery is utilized in many applications like cell phones or digital still cameras. In most cases, the Li-Ion battery voltage level only goes down to 3.0V, and not down to the full discharge level (2.7V) before requesting the charger. VDROP < 0.3V. This is the dropout voltage for the SP7611A. - VF = 3.1V. Low VF white LED forward voltage drop - VIN (at 20mA) needs to be greater than (VDROP+VF) 3.1V+.3V= 3.4V Key Advantages 1) No boost circuit needed for the LCD or keyboard backlight. 2) Drivers directly connected to a Li-Ion battery. 3) No EMI, no switching noise, no boost converter efficiency loss, 1 capacitor, and no inductor. Example 2: Drive high VF white or blue LEDs from existing bus ~ 4.0V to 5.5V High VF LEDs have a forward voltage drop in the range of 3.2V to 4.0V. In order to drive these LEDs with the maximum current of 20mA, enabling maximum brightness usually requires a boost circuit for a single cell Li-Ion power supply. The SP761X series is capable of driving high VF white or blue LEDs with its ultra-low dropout feature. The VIN needs to be only 300mV higher than the highest VF in the circuit. - VDROP < 0.3V. Dropout voltage of the SP7611A - VF (at 20mA) < 3.3V to 4.0V (High VF) - VIN (at 20mA) = VDROP + VF = 3.6V to 4.3V - VIN (at 5mA typical) ~ 3.3V Where VIN = Existing bus = 3.3V to 4.3V Key Advantages 1) No boost circuit needed for the LCD or keyboard backlight. 2) Drivers utilize existing bus. 3) Ultra-low voltage drop provides the full 20mA LED current at the lowest possible voltage level. Example 3: Drive white, blue, red, amber LED string In a boost circuit, or existing voltage bus, the SP761X series of LED drivers can be used to drive a whole string of LEDs and achieve flexible brightness control - whether using analog or PWM. VDROP = 0.3V. Dropout voltage of the SP7611A - VIN_MIN = N x VF + VDROP - VIN_MIN = N x VF + 0.3V Where VIN_MIN = Existing bus, boost Voltage ‘N’ number of LEDs Per Branch VF = Forward voltage of the LED Key Advantages 1) No need for current matching resistors and discrete transistors for brightness control. APPLICATION INFORMATION |
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