Intersil ISL78268EVAL1Z, User Manual

Page: 14 / 16

Application Note 1946
14
AN1946.0
July 7, 2014
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FIGURE 17. SOFT-START (NON-PREBIASED): DE MODE, V
IN
= 36V,
V
OUT
= 12V, I
OUT
= 2.5A, L = 4.7µH, C
OUT
= 98µF,
f
SW
= 300kHz
FIGURE 18. SOFT-START (NON-PREBIASED): DE MODE, V
IN
= 36V,
V
OUT
= 12V, I
OUT
= 0A, L = 4.7µH, C
OUT
= 98µF,
f
SW
= 300kHz
FIGURE 19. SOFT-START (NON-PREBIASED): FORCED-PWM MODE,
V
IN
= 36V, V
OUT
= 12V, I
OUT
= 2.5A, L = 4.7µH,
C
OUT
= 98µF, f
SW
= 300kHz
FIGURE 20. SOFT-START (NON-PREBIASED): FORCED-PWM MODE,
V
IN
= 36V, V
OUT
= 12V, I
OUT
= 0A, L = 4.7µH,
C
OUT
= 98µF, f
SW
= 300kHz
FIGURE 21. TRANSIENT RESPONSE: DE MODE, V
IN
= 36V,
V
OUT
= 12V, I
OUT
= 0.1A TO 4.5A, L = 4.7µH,
C
OUT
= 98µF
FIGURE 22. TRANSIENT RESPONSE: FORCED-PWM MODE,
V
IN
= 36V, V
OUT
= 12V, I
OUT
= 0.1A TO 4.5A, L = 4.7µH,
C
OUT
= 98µF
Typical Performance Curves
(Continued)
PH: 10V/DIV
SS: 1V/DIV
V
OUT
: 5V/DIV
FB: 1V/DIV
500µs/DIV
PH: 10V/DIV
SS: 1V/DIV
V
OUT
: 5V/DIV
FB: 1V/DIV
500µs/DIV
PH: 10V/DIV
SS: 1V/DIV
V
OUT
: 5V/DIV
FB: 1V/DIV
500µs/DIV
PH: 10V/DIV
SS: 1V/DIV
V
OUT
: 5V/DIV
FB: 1V/DIV
500µs/DIV
PH: 20V/DIV
I
L
: 2A/DIV
V
OUT
(AC): 500mV/DIV
COMP:
1V/DIV
500µs/DIV
PH: 10V/DIV
I
L
: 3A/DIV
V
OUT
(AC):200mV/DIV
COMP:
500mV/DIV
(1.5V DC-OFFSET)
500µs/DIV