ADD5203 데이터 시트보기 (PDF) - Analog Devices

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ADD5203

8-String, White LED Driver with SMBus and PWM Input for LCD Backlight Applications

Analog Devices 

ADD5203

VOUT

200mV/DIV

AC

VSW

20V/DIV

VIN = 7V, fSW = 1MHz

BRIGHTNESS = 100%

LEDs = 10 SERIES × 8 PARALLEL

IL

500mA/DIV

Figure 10. Switching Waveforms (VIN = 7 V)

VOUT

200mV/DIV

AC

VSW

20V/DIV

VIN = 21V, VSW = 1MHz

BRIGHTNESS = 100%

LEDs = 10 SERIES × 8 PARALLEL

IL

500mA/DIV

Figure 11. Switching Waveforms (VIN = 21 V)

PWM

3V/DIV

VFB1

5V/DIV

VIN = 12V

BRIGHTNESS = 0.39%

LEDs = 10 SERIES × 8 PARALLEL

IFB1

10mA/DIV

Figure 12. LED Current Waveforms (Brightness = 0.39%)

PWM

3V/DIV

VFB1

5V/DIV

IFB1

10mA/DIV

VIN = 12V

BRIGHTNESS = 25%

LEDs = 10 SERIES × 8 PARALLEL

Figure 13. LED FBx Waveforms (Brightness = 10%)

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