RT4531 Datasheet, PDF (7/14 Pages) Richtek Technology Corporation – Dual Channel 10s2p WLED Drivers

Typical Operating Characteristics
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
0
Efficiency vs. Output Current
VIN = 3.6V, VOUT = 31V, 10s2p, 20mA/string
0 0 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02
Output Current (A)
0.022
0.020
0.018
0.016
0.014
0.012
0.010
0.008
0.006
0.004
0.002
0.000
0
Dimming Linearity
ILED1
ILED2
VIN = 3.6V
20
40
60
80
100
Dimming Duty Cycle (%)
Switching Frequency vs. Temperature
1.13
1.08
1.03
0.98
0.93
0.88
-50 -25
0
25 50 75
Temperature (°C)
100 125
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS4531-01 July 2016
RT4531
100
95
90
85
80
75
70
65
60
55
50
2.5
Efficiency vs. Input Voltage
ILED = 20mA
ILED = 10mA
VOUT = 31V, 10s2p
3
3.5
4
4.5
5
5.5
Input Voltage(V)
Switching Frequency vs. Input Voltage
1.3
1.2
1.1
1.0
0.9
0.8
0.7
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Sense Voltage vs. Output Current
0.315
0.314
0.313
0.312
0.311
0.310
0 2.5 5 7.5 10 12.5 15 17.5 20
Output Current (mA)
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