Datenblatt-Suchmaschine für elektronische Bauteile |
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FAN5610 Datenblatt(PDF) 7 Page - Fairchild Semiconductor |
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FAN5610 Datenblatt(HTML) 7 Page - Fairchild Semiconductor |
7 / 10 page PRODUCT SPECIFICATION FAN5610 REV. 1.0.2 10/28/03 7 Digital Control with PWM (Continued) A and B are PWM. ILED (Average) = δ x 21mA where δ is Duty Cycle. (Note 6) Note: 6. Proportionally select the duty cycle to achieve the desired value of typical LED current between 1mA to 20mA. B Input (PWM) A Input (PWM) ss ss ss 0mA OFF ILED ILED (Average) = 0.3 x 21mA = 6.3mA ILED (Average) = 0.7 x 21mA = 14.7mA 1KHz 30% Duty Cycle 30% Duty Cycle 1KHz 70% Duty Cycle 70% Duty Cycle Application Information As seen in the block diagram, the FAN5610 includes four independent current regulators able to maintain a program- mable constant current through LEDs, regardless of their for- ward voltage. This is true over a wide range of input voltage starting from VF_max + 0.35V, where VF_max is the highest forward voltage among the LEDs driven by FAN5610. The independence of current (LED current changes less than 1%) with change in VIN and VF for VIN > VF (MAX) + 0.35V, is shown in the graph below. Program the LED’s brightness by applying a continuous voltage level or a PWM signal at the inputs of the built-in digital to analog converter (DAC). When a PWM signal is utilized to drive the DAC inputs, the current through the LEDs is switched between two levels with the PWM signal frequency. Consequently, the average current changes with the duty cycle. The LED current waveform tracks the PWM signal, so the LEDs brightness depends on the duty cycle. For white LEDs the spectral composition is optimal at a current level specified by the manufacturer. The DAC inputs should be programmed to set the current required to achieve white LED spectrum and PWM used for dimming. To main- tain the "purest" white, the current through the LEDs should be switched between zero and a specified current level (usually around 20mA) corresponding to the white light chromaticity coordinate. Conversion errors are minimized and the best LED to LED matching is achieved over the entire range of average current settings, when PWM brightness control is used to modulate the LED current between zero and the maximum value (A=1, B=1). Input Voltage (V) 0 5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 10 15 20 25 Current Regulation Performance VF2 =3 .6V VF1 = 3.3 V VIN > V F ( MAX) + 0.3 5V |
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