Intersil ISL78268EVAL1Z, User Manual

Page: 13 / 16

Application Note 1946
13
AN1946.0
July 7, 2014
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Typical Performance Curves
FIGURE 11. EFFICIENCY (AT +25°C): DE MODE, V
OUT
= 12V,
L = 4.7µH, f
SW
= 300k Ω
FIGURE 12. LOAD REGULATION
FIGURE 13. DE MODE: V
IN
= 36V, V
OUT
= 12V, I
OUT
= 2.5A,
L = 4.7µH, C
OUT
= 98µF, f
SW
= 300kHz (CONTINUOUS
CONDUCTION OPERATION)
FIGURE 14. DE MODE: V
IN
= 36V, V
OUT
= 12V, I
OUT
= 1.0A,
L = 4.7µH, C
OUT
= 98µF, f
SW
= 300kHz
(DISCONTINUOUS CONDUCTION OPERATION)
FIGURE 15. FORCED PWM MODE, V
IN
= 36V, V
OUT
= 12V,
I
OUT
= 2.5A, L = 4.7µH, C
OUT
= 98µF, f
SW
= 300kHz
FIGURE 16. FORCED PWM MODE, V
IN
= 36V, V
OUT
= 12V,
I
OUT
= 1.0A, L = 4.7µH, C
OUT
=98µF, f
SW
= 300kHz
50
55
60
65
70
75
80
85
90
95
100
0 1 2 3 4 5
I
OUT
(A)
V
OUT
= 12V, T
A
= +25°C
V
IN
= 15V
V
IN
= 24V
V
IN
= 36V
V
IN
= 55V
E
F
F
ICIENCY (%
)
11.80
11.85
11.90
11.95
12.00
12.05
12.10
12.15
12.20
12.25
12.30
0 1 2 3 4 5
V
OU
T
(V)
I
OUT
(A)
V
IN
= 15V
V
IN
= 24V
V
IN
= 36V
V
IN
= 55V
2µs/DIV
I
L
: 2A/DIV
PH: 10V/DIV
V
OUT
: 2V/DIV
V
IN
: 5V/DIV
2µs/DIV
I
L
: 2A/DIV
PH: 10V/DIV
V
OUT
: 2V/DIV
V
IN
: 5V/DIV
2µs/DIV
I
L
: 2A/DIV
PH: 10V/DIV
V
IN
: 5V/DIV
V
OUT
: 2V/DIV
I
L
: 2A/DIV
PH: 10V/DIV
V
OUT
: 2V/DIV
V
IN
: 5V/DIV
2µs/DIV