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FAN5611MPX Scheda tecnica(PDF) 9 Page - Fairchild Semiconductor |
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FAN5611MPX Scheda tecnica(HTML) 9 Page - Fairchild Semiconductor |
9 / 14 page © 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9 9 Example 3: Drive white, blue, red, amber LEDs string Assuming a boost circuit or existing voltage bus, the FAN561X series of LED drivers can be used to drive a whole string of LEDs with flexible brightness control via 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 con- trol. These control methods can be applied to the circuit in two different ways to provide more flexibility than other solutions. To determine the value of RSET, use the ISET vs. VCTRL graph in Figure 4. 1. FAN5611 - Analog Set VCONTROL and RSET for LED current using: - 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 using: - PWM - 1 VCONTROL = PWM – Amplitude sets maximum LED current. – Pulse width controls between 0 and maximum. - PWM - 2 Set VCONTROL and RSET for maximum LED current using: ON/OFF = PWM – Amplitude has no effect on current. – Pulse width controls between 0 and maximum. 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 ------------------------------------------------------------------------- = I LED 200 I SET × ∼ |
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