SBVS147 – SEPTEMBER 2010
www.ti.com
TYPICAL CHARACTERISTICS
ANALOG DIMMING LINEARITY
(I
LED
vs VADJ)
160
140
120
100
1000
PWM DIMMING LINEARITY
(I
LED
vs CTRL PULSE DURATION)
T
A
= +25
°
C
VIN = 24V
I
LED
(mA)
80
60
40
20
0
0
0.2
0.4
0.6
0.8
VADJ (V)
1.0
1.2
1.4
T
A
= +25
°
C
VIN = 24V
R
S
= 5W
PWM = 100% duty
I
LED
(mA)
100
10
1
0.1
VADJ = 1.2V (100%)
VADJ = 0.6V (50%)
VADJ = 0.12V (10%)
0.1
1
10
PWM Dimming Duty at 320Hz (%)
100
0.01
Figure 5.
TYPICAL TURN-ON WAVEFORM
T
A
= +25
°
C
VIN = 24V
2
m
s
I
LED1
(50mA)
Figure 6.
TYPICAL TURN-OFF WAVEFORM
I
LED1
(50mA)
T
A
= +25
°
C
VIN = 24V
I
LED1
(0mA)
CTRL1
CTRL1
2
m
s
I
LED1
(0mA)
Time (2
m
s/div)
Time (2
m
s/div)
Figure 7.
LDO LOAD REGULATION
5.25
5.20
5.15
5.10
T
A
= +25
°
C
VIN = 24V
5.25
5.20
5.15
5.10
Figure 8.
LDO LINE REGULATION
T
A
= +25
°
C
Load = 25mA
VREG5 (V)
5.05
5.00
4.95
4.90
4.85
4.80
4.75
0
5
10
15
20
Load Current (mA)
25
30
VREG5
VREG5 (V)
5.05
5.00
4.95
4.90
4.85
4.80
4.75
10
12
14
16
18
20
VIN (V)
22
24
26
28
VREG5
Figure 9.
Figure 10.
10
Product Folder Link(s):
Copyright © 2010, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
