Datasheet

0 0.5 1.0 1.5 2.0 2.5
0.9
1.0
1.1
1.2
1.3
VALLEY CURRENT
LIMIT THRESHOLD (A)
V
FB
(V)
V
IN
= 8V
15V
24V
34V
40V
0 10 20 30 40
V
IN
(V)
R
ON
/SD PIN VOLTAGE (V)
0
1.0
2.0
3.0
100k
500k
R
ON
= 45k
0
2 4
6
8 10 12
I
CC
(mA)
0
1
2
3
4
5
6
7
8
V
CC
(V)
V
IN
= 9V
V
IN
= 8V
V
IN
10V
t
V
CC
Externally Loaded
F
S
= 200 kHZ
0
V
IN
(V)
0.1
1.0
10
ON-TIME (Ps)
40
10 20 30
0.3
3.0
600k
400k
200k
100k
R
ON
= 45k
6.5 7.0 7.5 8.0 8.5 9.0
5.0
5.5
6.0
6.5
7.0
7.5
V
CC
(V)
V
IN
(V)
0 200 400 600 800 1000
70
75
80
85
90
95
100
EFFICIENCY (%)
LOAD CURRENT (mA)
Vin = 8V
12V
24V
40V
V
OUT
= 5V
F
S
= 275 kHz
LM34914
www.ti.com SNVS453B –MAY 2006–REVISED MARCH 2013
Typical Performance Characteristics
Unless otherwise specified the following conditions apply: T
J
= 25°C
Typical Efficiency Performance V
CC
vs V
IN
Figure 1. Figure 2.
V
CC
vs I
CC
ON-Time vs V
IN
and R
ON
Figure 3. Figure 4.
Valley Current Limit Threshold
vs.
FB
and V
IN
Voltage at the RON/SD Pin
Figure 5. Figure 6.
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