ISL78268 Datasheet, PDF (17/33 Pages) Intersil Corporation – Integrated 2A sourcing

ISL78268
Typical Performance
All the performance curves are taken from the Evaluation Board (ISL78268EVAL1Z) unless otherwise noted. (Continued)
V_OUT : 5V/DIV
SS: 1V/DIV
V_OUT : 5V/DIV
SS: 1V/DIV
FB: 1V/DIV
FB: 1V/DIV
PH: 10V/DIV
500µs/DIV
FIGURE 24. SOFT-START (PREBIASED): DE MODE, V_IN = 36V,
V_OUT = 12V, I_OUT = 0A, L = 4.7µH, C_OUT = 98µF,
f_SW = 300kHz
12.30
12.25
12.20
12.15
12.10
12.05
12.00
11.95
11.90
11.85
11.80
0
V_IN = 55V
V_IN = 36V
V_IN = 24V
V_IN = 15V
1
2
3
4
5
I_OUT (A)
FIGURE 26. LOAD REGULATION
PH: 10V/DIV
500µs/DIV
FIGURE 25. SOFT-START (PREBIASED): FORCED-PWM MODE,
V_IN = 36V, V_OUT = 12V, I_OUT = 0A, L = 4.7µH,
C_OUT = 98µF, f_SW = 300kHz
12.30
12.25
12.20
12.15
12.10
12.05
I_OUT = 1A
I_OUT = 0.1A
12.00
11.95
11.90
11.85
I_OUT = 3A
11.80
10
20
30
40
50
60
V_IN (V)
FIGURE 27. LINE REGULATION
V_OUT (AC) : 500mV/DIV
COMP:
1V/DIV
I_L: 2A/DIV
PH: 20V/DIV
500µs/DIV
FIGURE 28. TRANSIENT RESPONSE: DE MODE, V_IN = 36V,
V_OUT = 12V, I_OUT = 0.1A TO 4.5A, L = 4.7µH,
C_OUT = 98µF
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V_OUT (AC) :200mV/DIV
COMP:
500mV/DIV ^{(1.5V DC-FFSET)}
I_L: 2A/DIV
PH: 20V/DIV
500µs/DIV
FIGURE 29. TRANSIENT RESPONSE: DE MODE, V_IN = 36V,
V_OUT = 12V, I_OUT = 1A TO 3A, L = 4.7µH, C_OUT = 98µF
FN8657.3
December 12, 2014