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ISL97675 Datasheet(PDF) 13 Page - Renesas Technology Corp

Part # ISL97675
Description  4-Channel LED Driver with Phase Shift Control
Download  21 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL97675 Datasheet(HTML) 13 Page - Renesas Technology Corp

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ISL97675
FN7630 Rev.2.00
Page 13 of 21
Sep 13, 2017
PWM Control
The ISL97675 has a high speed 8-bit digitizer that decodes an
incoming PWM signal and converts it into four channels of 8-bit
PWM current with a phase shift function that will be described later.
During the PWM On period, the LED peak current is defined by the
value of RISET resistor, the average LED current of each channel is
controlled by ILEDmax and the PWM duty cycle in percent as:
When the PWM input = 0, all channels are disconnected and the
ILED is guaranteed to be <10µA in this state.
The PWM dimming frequency is adjusted by a resistor at the
RFPWM pin, which will be described in “PWM Dimming
Frequency Adjustment” on page 14.
Phase Shift Control
The ISL97675 is capable of delaying the phase of each current
source. Conventional LED drivers pose the worst load transients
to the boost circuit by turning on all channels simultaneously as
shown in Figure 20. In contrast, the ISL97675 phase shifts each
channel by turning them on once during each PWM dimming
period as shown in Figure 21. At each dimming duty cycle except
at 100%, the sum of the phase shifted channel currents will be
less than a conventional LED driver as shown in Figure 21 and
23. Equal phase means there is fixed delay between channels
and such delay can be calculated as:
where (255/N) in Equation 6 and Equation 7 can only be integer
because the PWM dimming is controlled by an internal 8-bit
ILED ave

ILEDmax PWM
=
(EQ. 5)
FIGURE 20. CONVENTIONAL 4-Ch LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
ILED1-20mA
ILED_Total_80mA
TIME (ms)
ILED2-20mA
ILED3-20mA
ILED4-20mA
510
15
FIGURE 21. PHASE SHIFT 4-Ch LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
ILED1-20mA
ILED_Total_20mA
TIME (ms)
ILED2-20mA
ILED3-20mA
ILED4-20mA
5
10
FIGURE 22. CONVENTIONAL LED DRIVER PWM DIMMING CHANNEL
AND TOTAL CURRENT AT 50% DUTY CYCLE
ILED4-20mA
ILED_Total_80mA
TIME (ms)
ILED3-20mA
ILED2-20mA
ILED1-20mA
5
10
FIGURE 23. EQUAL PHASE SHIFT LED DRIVERpwm DIMMING
CHANNEL AT 50% DUTY CYCLE
ILED4-20mA
ILED_Total_40mA
TIME (ms)
ILED3-20mA
ILED2-20mA
ILED1-20mA
5
10
tD1
tFPWM
255

------------------x 255
N
----------


=
(EQ. 6)
tD2
tFPWM
255
------------------x 255

N1
 255
N
----------




=
(EQ. 7)


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