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AL9910_1106 Datasheet(PDF) 10 Page - Diodes Incorporated |
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AL9910_1106 Datasheet(HTML) 10 Page - Diodes Incorporated |
10 / 15 page AL9910/AL9910A/AL9910-5 UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER AL9910/AL9910A/AL9910-5 Document number: DS 35103 Rev. 3 - 2 10 of 15 www.diodes.com June 2011 © Diodes Incorporated Applications Information (Continued) AC/DC Off-Line LED driver The AL9910 is a cost-effective off-line buck LED driver-controller specifically designed for driving LED strings. It is suitable for being used with either rectified AC line or any DC voltage between 15-500V. See figure 3 for typical circuit. Fig. 3 Typical Application Circuit (without PFC) Buck design equations: = D IN LEDs V V osc ON f D t = ≥ L LED ON LEDs IN I 3 . 0 t ) V V ( × × − = SENSE R )) 3 . 0 I ( 5 . 0 ( I 25 . 0 LED LED × × + where ILED x 0.3 = IRIPPLE Design example For an AC line voltage of 120V the nominal rectified input voltage VIN = 120V*1.41 = 169V. From this and the LED chain voltage the duty cycle can be determined: D = VLEDs /VIN = 30/169 = 0.177 From the switching frequency, for example fOSC = 50kHz, the required on-time of the external MOSFET can be calculated: tON = D/fOSC = 3.5 µs The value of the inductor is determined as follows: L = (VIN - VLEDs) * tON /(0.3 * ILED) = 4.6mH R SENSE AL9910/A GATE CS LD PWM_D GND R OSC V DD V IN LED + LED - V AC IN Q1 L1 D1 C1 R OSC C2 C3 BR1 R SENSE AL9910/A GATE CS LD PWM_D GND R OSC V DD V IN LED + LED - V AC IN Q1 L1 D1 C1 R OSC C2 C3 BR1 |
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