ISL78100 Datasheet, PDF (7/19 Pages) Intersil Corporation – High Power LED Driver

Typical Performance Curves (Continued)
ISL78100
LX
8 LEDs
V_IN = 16V
PWM = 100Hz
IL
VOUT
(AC
COUPLED)
FB
FIGURE 19. 50% PWM DIMMING AT 100Hz
LX
8 LEDs
V_IN = 16V
PWM = 10kHz
IL
VOUT
(AC
COUPLED)
FB
FIGURE 20. 50% PWM DIMMING AT 10kHz
LX
8 LEDs
V_IN = 12V
PWM = 1kHz
IL
VOUT
(AC
COUPLED)
FB
FIGURE 21. 10% PWM DIMMING AT 1kHz
LX
IL
VOUT
(AC
COUPLED)
8 LEDs ^VIN ^{= 16V} DUTY CYCLE = 50% PWM = 1kHz ^FB
FIGURE 22. 50% PWM DIMMING AT 1kHz ZOOM-IN
LX
TRANSIENT RESPONSE WHEN LOAD DYNAMICALLY
CHANGES FROM 8 LEDs TO 7 LEDs
8 LEDs V_O
V_IN = 12V
I_LED = 350mA
VOUT
(WITH 25.6V
OFFSET)
7 LEDs V_O
FIGURE 23. TRANSIENT RESPONSE OPERATES FROM
8 TO 7 LEDs
7
LX
TRANSIENT RESPONSE WHEN LOAD DYNAMICALLY
CHANGES FROM 7LEDs TO 8LEDs
V_IN = 12V
I_LED = 350mA
8 LEDs V_O
VOUT
(WITH 25.6V
OFFSET)
7 LEDs V_O
FIGURE 24. TRANSIENT RESPONSE OPERATES FROM
7 TO 8 LEDs
FN6626.0
December 17, 2007