Datasheet

TEMPERATURE (°C)
I
LED
(A)
1.25
1.00
0.75
0.50
0.25
0.00
0 25 50 75 100 125
R
GAIN
= 15 k:
R
GAIN
= 5 k:
R
GAIN
= 10 k:
TEMPERATURE (°C)
I
LED
(A)
1.25
1.00
0.75
0.50
0.25
0.00
0 25 50 75 100 125
R
BIAS
= 43.2 k:
R
BIAS
= 84.5 k:
R
BIAS
= 24.3 k:
f
SW
(Hz)
R
T
(Ö)
1M
100k
10k
1k
10k 100k 1M 10M
TEMPERATURE (°C)
I
TF
(éA)
100.3
100.1
99.9
99.7
99.5
-50 -14 22 58 94 130
LM3424
www.ti.com SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
T
A
=+25°C and V
IN
= 14V unless otherwise specified
I
TF
vs. Junction Temperature
R
GAIN
= 10 kΩ; V
TSENSE
= 0.5V; V
TREF
= 1.5V f
SW
vs. R
T
Figure 15. Figure 16.
Ideal Thermal Foldback - Varied Slope Ideal Thermal Foldback - Varied Breakpoint
R
REF1
= R
REF2
= 49.9 kΩ; R
NTC-BK
= R
BIAS
= 43.2 kΩ R
REF1
= R
REF2
= 49.9 kΩ; R
GAIN
= 10 kΩ
Figure 17. Figure 18.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Links: LM3424