NTJD1155L
TYPICAL PERFORMANCE CURVES (T J = 25 ° C unless otherwise noted)
22
40
20
18
16
14
12
10
8
6
4
I L = 1 A
V on/off = 3 V
Ci = 10 m F
Co = 1 m F
t d(off)
t f
t r
36
32
28
24
20
16
12
8
I L = 1 A
V ON/OFF = 1.5 V
Ci = 10 m F
Co = 1 m F
t f
t r
t d(on)
2
0
0
1
2
3
4
5
6
t d(on)
7
8
4
0
0
1
2
3
4
5
6
t d(off)
7
8
R2 (k W )
Figure 8. Switching Variation
R2 @ V in = 4.5 V, R1 = 20 k W
12
10
t f
R2 (k W )
Figure 9. Switching Variation
R2 @ V in = 2.5 V, R1 = 20 k W
8
6
4
2
I L = 1 A
V on/off = 3 V
Ci = 10 m F
Co = 1 m F
t d(off)
t r
t d(on)
0
0
1
2
3
4
5
6
7
8
R2 (k W )
Figure 10. Switching Variation
R2 @ V in = 2.5 V, R1 = 20 k W
10
Normalized to R q JA at Steady State ( 1 inch pad)
1
D = 0.5
0.2
0.1
0.1
0.01
SINGLE PULSE
0.01
0.001
0.02
0.01
0.05
0.1
P (pk)
t 1
t 2
DUTY CYCLE, D = t 1 /t 2
1 10
R q JC (t) = r(t) R q JC
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t 1
T J(pk) ? T C = P (pk) R q JC (t)
100 1000
SQUARE WAVE PULSE DURATION TIME t, (s)
Figure 11. FET Thermal Response
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4
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