ISL78171 Datasheet, PDF (11/29 Pages) Intersil Corporation – 6-Channel, 50mA Automotive LED Driver with Ultra-high Dimming Ratio and Phase Shift Control

ISL78171
Typical Performance Curves LED configuration: 6P10S (Continued)
6P12S, 20mA/CH
V_O = 1V/DIV
10.0ms/DIV
ILED = 20mA/DIV
6P12S, 20mA/CH
V_O = 1V/DIV
10.0ms/DIV
ILED = 20mA/DIV
FIGURE 20. BOOST OUTPUT VOLTAGE WITH BRIGHTNESS CHANGE
FROM 0% TO 100%, V_IN = 12V, 6P12S AT
20mA/CHANNEL
FIGURE 21. BOOST OUTPUT VOLTAGE WITH BRIGHTNESS CHANGE
FROM 100% TO 0%, V_IN = 12V, 6P12S AT
20mA/CHANNEL
6P12S, 20mA/CH
V_O = 10V/DIV
20.0ms/DIV
ILED = 20mA/DIV
EN
I_V_IN = 1A/DIV
FIGURE 22. ISL78171 SHUTS DOWN AND STOPS SWITCHING
~30ms AFTER EN GOES LOW
0.0030
0.0025
0.0020
0.0015
0.0010
0.006
0.007
F_PWM = 200Hz
NO CH CAPS
I_LED = 20mA AT 100% DUTY CYCLE
0.008 0.009 0.010 0.011 0.012 0.013 0.014
PWM DIMMING DUTY CYCLE (%)
FIGURE 23. DIRECT PWM DIMMING LINEARITY AT VERY LOW DUTY
CYCLE
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FN8602.0
June 15, 2015