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A8516ELPTR-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A8516ELPTR-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 17 page LED Backlight Driver for LCD Monitors and Televisions A8516 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Typical PWM Operation Waveforms VBAT = 12 V, Load = 6 strings, 16 LEDs each string, 56 mA per string, Output capacitors = 2 × 2.2 μF ceramic t t VPWM VOUT VEN VPWM VOUT ILED VEN C1 C1 C2 C2 C4 Symbol Parameter Units/Division C1 VEN 10 V C2 VPWM 10 V –* VOUT 1 V C4 Total ILED 100 mA t time 2 ms *Offset = 46 V Symbol Parameter Units/Division C1 VEN 10 V C2 VPWM 10 V –* VOUT 1 V C4 ILED 100 mA t time 50 μs *Offset = 46 V PWM dimming at 200 Hz 10% duty cycle; Output voltage ripple approximately 0.8 V (out of 50 V) PWM dimming at 5 kHz 10% duty cycle 1 100 90 80 70 60 50 40 30 20 10 0 10 0.1 100 10 1 0.1 PWM Frequency (kHz) PWM Duty Cycle (%) Ratio of LED Current versus PWM Frequency PWM duty cycle = 10% Ratio of LED Current versus PWM Duty Cycle PWM frequency = 200 Hz 0.1 1 10 100 Compensated pulse width Uncompensated pulse width To improve the accuracy of PWM dimming at very high frequency and/or very low duty cycle, it is necessary to compensate the PWM pulse width, as described in Application Information section. |
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