Intersil ISL8272MEVAL1Z, User Manual

Page: 12 / 15

User Guide 003
12
UG003.0
September 17, 2014
Submit Document Feedback
FIGURE 17. LOAD TRANSIENT RESPONSE AT V
IN
= 12V, V
OUT
= 1V,
I
OUT
= 0A TO 25A (>100A/ μ s), f
SW
= 533kHz.
C
OUT
= 8 x 100 μ F C 4 x 470 μ F POSCAP
FIGURE 18. LOAD TRANSIENT RESPONSE AT V
IN
= 12V, V
OUT
= 3.3V,
I
OUT
= 0A TO 25A (>100A/ μ s), f
SW
= 533kHz.
C
OUT
= 4 x 100 μ F C 2 x 470 μ F POSCAP
FIGURE 19. SOFT-START AT V
IN
= 12V, V
OUT
= 1.2V,
TON_DELAY = 5ms, TON_RISE = 5ms,
POWER_GOOD_DELAY = 4ms
FIGURE 20. SOFT-STOP AT V
IN
= 12V, V
OUT
= 1.2V,
TOFF_DELAY = 5ms, TOFF_FALL = 5ms
FIGURE 21. OUTPUT SHORT CIRCUIT PROTECTION AT V
IN
= 12V,
V
OUT
= 1.2V, f
SW
= 533kH
z
FIGURE 22. OUTPUT OVERVOLTAGE PROTECTION AT V
IN
= 12V,
V
OUT
= 1.2V, f
SW
= 533kHz,
VOUT_OV_FAULT_LIMIT = 1.38V
Typical Performance Data
The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued)
V
OUT
(50mV/DIV)
I
OUT
(25A/DIV)
20µs/DIV
ASCR GAIN = 550
RESIDUAL = 100
V
OUT
(50mV/DIV)
I
OUT
(25A/DIV)
50µs/DIV
ASCR GAIN = 220
RESIDUAL = 90
ENABLE
V
OUT
(1V/DIV)
POWER-GOOD
5ms/DIV
ENABLE
V
OUT
(1V/DIV)
POWER-GOOD
5ms/DIV
PHASE1 (10V/DIV)
PHASE2 (10V/DIV)
V
OUT
(1V/DIV)
I
IN
(5A/DIV)
10µs/DIV
PHASE1 (10V/DIV)
PHASE2 (10V/DIV)
V
OUT
(500mV/DIV)
20µs/DIV