EL7554
Waveforms
VIN = VD = 3.3V, VO = 1.8V, IO = 4A, L = 2.2µH, CIN = 2x10µF, COUT = 47µF, COSC = 220pF, TA = 25°C unless otherwise noted.
VIN (2V/DIV)
IIN (1A/DIV)
VO (1V/DIV)
PG (2V/DIV)
0.5ms/DIV
FIGURE 12. START-UP
ΔVIN (100mV/DIV)
VLX (2V/DIV)
ΔVO (10mV/DIV)
1µs/DIV
FIGURE 13. STEADY-STATE OPERATION
VEN
IIN (2A/DIV)
VO (2V/DIV)
50µs/DIV
FIGURE 14. SHUT-DOWN
3A
1.0A
IO
ΔVO (100mV/DIV)
100µs/DIV
FIGURE 15. TRANSIENT RESPONSE
TM
SEL
ΔVO (200mV/DIV)
1ms/DIV
FIGURE 16. VOLTAGE MARGINING
8
PG
VO (2V/DIV)
VLX (5V/DIV)
0.5ms/DIV
FIGURE 17. OVER-VOLTAGE SHUT-DOWN
FN7360.4
May 8, 2006