EL7531
Performance Curves and Waveforms (Continued)
All waveforms are taken at V =3.3V, V =1.8V, I =1A with component values shown on page 1 at room ambient temperature, unless otherwise
IN
O
O
noted.
I
I
O
O
(0.5A/DIV)
(0.5A/DIV)
∆V
∆V
O
O
(100mV/DIV)
(100mV/DIV)
50µs/DIV
100µs/DIV
FIGURE 19. LOAD TRANSIENT RESPONSE (22mA to 1A)
FIGURE 20. PWM LOAD TRANSIENT RESPONSE (0A TO 1A)
I
=150mA
O
SYNC
(2V/DIV)
I
O
(0.5A/DIV)
∆V
O
(100mV/DIV)
LX
(2V/DIV)
2µs/DIV
50µs/DIV
FIGURE 21. PWM LOAD TRANSIENT RESPONSE (0.25A TO
0.75A)
FIGURE 22. PFM-PWM TRANSITION TIME
3
2
I
=50mA
O
SYNC
(2V/DIV)
1
0
-1
LX
PFM
PWM
600
(2V/DIV)
-2
-3
0
200
400
800
1000
1200
I
(mA)
2µs/DIV
OUT
FIGURE 23. PFM-PWM TRANSITION TIME
FIGURE 24. PFM-PWM LOAD REGULATION
FN7428.6
August 5, 2005
7
INTERSIL [ Intersil ]
