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FAN5611 Folha de dados(PDF) 8 Page - Fairchild Semiconductor |
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FAN5611 Folha de dados(HTML) 8 Page - Fairchild Semiconductor |
8 / 12 page FAN5611/FAN5612/FAN5613/FAN5614 PRODUCT SPECIFICATION 8 REV. 1.0.4 6/4/04 In some cases, there is already a voltage bus in the system, which can be utilized. Due to the ultra-low voltage drop of the FAN561X series of LED drivers to drive high VF white or blue LEDs. The VIN needs to be only 300mV higher than the highest VF in the circuit. –VDROP < 0.3V –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: • No boost circuit needed for LCD or keyboard backlight • Driver utilizes the existing bus • Ultra-low voltage drop provides the full 20mA LED current at the lowest possible voltage level. Example 3: Drive white, blue, red, amber LEDs string Assuming boost circuit, or existing voltage bus, the FAN561X series of LED drivers can be used to drive a whole string of LEDs and flexible brightness control - analog and/or PWM. –VDROP < 0.3V –VIN_MIN = N × VF + VDROP –VIN _MAX = N × VF + 5.5V Where VIN = Existing bus, boost voltage Key advantage: • No need for current matching resistors and discrete transistor for brightness control LED Brightness Control All of the FAN561X LED Drivers feature analog and PWM controls to give designers flexible brightness control. These control methods can be applied to the circuit in two different ways, to provide more flexibility than any other solution. To determine the value of RSET, use the “ISET vs. VCTRL” graph under the Typical Performance Characteristics section. 1. FAN5611 - Analog Set VCONTROL and RSET for LED current - PWM VCONTROL = PWM – Amplitude sets maximum LED current – Pulse width controls between 0 and maximum 2. FAN5612 - Analog Set VCONTROL and RSET for LED current - PWM - 1 VCONTROL = PWM ISET RSET I1 I2 I3 I4 VIN GND FAN5613 CTRL V CONTROL ENABLE ON/OFF VIN ISET RSET I1 I2 I3 I4 GND FAN5613 CTRL V CONTROL 'N' number of LEDs Per Branch ON/OFF ENABLE ISET RSET I1 I2 I3 I4 VIN GND FAN5611 CTRL V CONTROL (3V) I LED 200 V CONTROL V CTRL – () × R SET ------------------------------------------------------------------------- = RSET I1 I2 I3 VIN GND FAN5612 CTRL V CONTROL ISET ON/OFF ENABLE I LED 200 V CONTROL V CTRL – () × R SET ------------------------------------------------------------------------- = |
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