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ISL97692, ISL97693, ISL97694A
t PWMIN
ILED1-20mA
PWMI
60%
t FPWM (t PWMOUT )
ILED2-20mA
ILED3-20mA
ILED4-20mA
ILED1
ILED2
t ON
60%
t OFF
40%
ILED3
ILED_Total_20mA
5
10
TIME (ms)
ILED4
FIGURE 22. ISL97692 PHASE SHIFT 4-CH LED DRIVER WITH 10%
PWM DIMMING CHANNEL CURRENT (UPPER) AND
TOTAL CURRENT (LOWER)
ILED4-20mA
ILED3-20mA
ILED2-20mA
ILED1-20mA
ILED1
FIGURE 25. ISL97692 4 CHANNELS PHASE SHIFT TIMING
ILLUSTRATION
PWM Dimming Frequency Adjustment
(ISL97692/4A)
The ISL97692 and ISL97694A can use an internal oscillator to
generate the PWM dimming frequency. In this mode, the duty of
the signal at PWMI pin is measured with 8- or 12-bit resolution,
and applied to the internally generated PWM dimming frequency.
The dimming frequency is set by an external resistor R FPWM at
the FPWM pin for ISL97692 and ISL97694A, per Equation 7:
58.1 × 10
F PWM
ILED_Total_80mA
6
R FPWM = ------------------------
Where:
(EQ. 7)
58.1 × 10
R FPWM = ------------------------ = 121k Ω
5 10
TIME (ms)
FIGURE 23. CONVENTIONAL LED DRIVER PWM DIMMING CHANNEL
AND TOTAL CURRENT AT 50% DUTY CYCLE
ILED4-20mA
ILED3-20mA
ILED2-20mA
- F PWM is the required PWM dimming frequency (Hz)
- R FPWM is the resistor from FPWM pin to GND ( Ω)
For example, to set the PWM dimming frequency to 480Hz:
6
(EQ. 8)
480
The maximum allowed PWM dimming frequency varies
according to the PWM resolution, per Table 1. This is configurable
for the ISL97694A by the En12Bit and En10Bit bits in register
0x01.
TABLE 1. MAX PWM DIMMING FREQUENCY SET BY R FPWM
ILED1-20mA
ILED_Total_40mA
PART
ISL97692
MAX FREQUENCY
(kHz)
30
30
PWM RESOLUTION
(Bit Mode)
8
8
5
10
ISL97694A
7.5
10
TIME (ms)
FIGURE 24. ISL97692 PHASE SHIFT LED DRIVER PWM DIMMING
CHANNEL AT 50% DUTY CYCLE
16
1.875
12
FN7839.4
December 20, 2012
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