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.
V
IN
(2V/DIV)
EN
I
IN
(0.5A/DIV)
I
IN
(0.5A/DIV)
V
O
(2V/DIV)
V
PG
O
(2V/DIV)
PG
500µs/DIV
200µs/DIV
FIGURE 13. START-UP AT I = 1A
O
FIGURE 14. ENABLE AND SHUT-DOWN
LX
(2V/DIV)
LX
(2V/DIV)
I
L
I
(0.5A/DIV)
L
(0.5A/DIV)
∆V
O
∆V
(10mV/DIV)
O
(50mV/DIV)
0.5µs/DIV
2µs/DIV
FIGURE 15. PFM STEADY-STATE OPERATION WAVEFORM
(I = 100mA)
FIGURE 16. PWM STEADY-STATE OPERATION (I = 1A)
O
O
SYNC
(2V/DIV)
SYNC
(2V/DIV)
LX
LX
(2V/DIV)
(2V/DIV)
I
I
L
L
(0.5A/DIV)
(0.5A/DIV)
20ns/DIV
0.2µs/DIV
FIGURE 17. EXTERNAL SYNCHRONIZATION TO 2MHz
FIGURE 18. EXTERNAL SYNCHRONIZATION TO 12MHz
FN7428.6
6
August 5, 2005
INTERSIL [ Intersil ]
