RT4832A
BLED Accuracy Linearty
DSV Accuracy_CPOUT
2
1
1.0
0.8
0.6
0.4
0.2
0.0
V
= 3.7V, 0x0C = 0x48, 0x0D = 0x18,
IN
0x0E = 0x14, 0x0F = 0x14
0
-1
-2
-3
-4
-5
-6
-7
-8
-0.2
2.5V
3V
3.5V
4V
4.5V
-0.4
-0.6
-0.8
-1.0
V
= 3.7V, 2P10S, LED Brightness
IN
code from 0 to 2048
0.005
0.01
0.015
0.02
0.025
0
10
20
30
40
ILED (A)
DAC Code
BLED Matching Linearty
BLED ILED vs. Brightness Code
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.025
0.020
0.015
0.010
0.005
0.000
V
= 3.7V, 2P10S, LED Brightness
IN
code from 0 to 2048
V
= 3.7V, 2P10S, LED Brightness
IN
code from 0 to 2048, 0x02[4] = 1
0.005
0.01
0.015
0.02
0.025
0
256 512 768 1024 1280 1536 1792 2048
Brightness Code
ILED (A)
BLED Efficiency vs. Input Voltage
BLED ILED vs. Brightness Code
90
88
86
84
82
80
78
76
74
72
70
0.025
V
= 3.7V, 2P10S, LED Brightness
IN
code from 0 to 2048, 0x02[4] = 0
0.020
0.015
0.010
0.005
0.000
1MHz
500kHz
V
= 2.5V to 5.5V, 2P10S,
IN
I
= 25mA per string
LED
2.5
3
3.5
4
4.5
5
5.5
0
256 512 768 1024 1280 1536 1792 2048
Brightness Code
Input Voltage (V)
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
10
DS4832A-00 January 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
