Datasheet

1 50
96
104
106
5
I
LDEX
– Output Current Matching - %
OUTPUT CURRENT MATCHING
vs
PWM DIMMING (VIN = 390 V)
100
102
100
Dimming Duty Cycle - %
98
3 10 75
ILED1
ILED2
ILED3
ILED4
1 50
96
104
106
5
I
LDEX
– Output Current Matching - %
OUTPUT CURRENT MATCHING
vs
PWM DIMMING (VIN = 370 V)
100
102
100
Dimming Duty Cycle - %
98
3 10 75
ILED1
ILED2
ILED3
ILED4
1 50
96
104
106
5
I
LDEX
– Output Current Matching - %
OUTPUT CURRENT MATCHING
vs
PWM DIMMING (VIN = 410 V)
100
102
100
Dimming Duty Cycle - %
98
3 10 75
ILED1
ILED2
ILED3
ILED4
Test Data www.ti.com
9 Test Data
9.1 Current Matching With PWM Dimming
The following table was taken with a 300-Hz PWM dimming frequency. Each LED output was loaded with
32 Cree XLamp XR-E diodes. At full load the current was controlled to a target current of 250 mA through
each LED output string.
Figure 5. V
IN
= 390 V, Current Matching Figure 6. V
IN
= 370 V, Current Matching
Figure 7. V
IN
= 410 V, Current Matching
10
98-W Resonant LLC, 4-String LED Driver SLUU487A–March 2011–Revised March 2011
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