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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