Rainbow Electronics MAX1771 - Manual (Page 5)

MAX1771
12V or Adjustable, High-Efficiency,
Low I Q , Step-Up DC-DC Controller
_______________________________________________________________________________________ 5
2µs/div
V IN = 5V, I OUT = 900mA, V OUT = 12V
A: EXT VOLTAGE, 10V/div
B: INDUCTOR CURRENT, 1A/div
C: V
OUT RIPPLE, 50mV/div, AC-COUPLED
A
B
C
V OUT
0V
I LIM
0A
HEAVY-LOAD SWITCHING WAVEFORMS
Typical Operating Characteristics (continued)
(Circuit of Figure 2a, T
A
= +25°C, unless otherwise noted.)
10µs/div
V IN = 5V, I OUT = 500mA, V OUT = 12V
A: EXT VOLTAGE, 10V/div
B: INDUCTOR CURRENT, 1A/div
C: V
OUT RIPPLE, 50mV/div, AC-COUPLED
A
B
C
V OUT
0V
I
LIM
0A
MEDIUM-LOAD SWITCHING WAVEFORMS
5ms/div
I
OUT
= 700mA, V
OUT
= 12V
A: V
IN
, 5V to 7V, 2V/div
B: V
OUT
RIPPLE, 100mV/div, AC-COUPLED
A
B
5V
7V
0V
LINE-TRANSIENT RESPONSE
5ms/div
V IN = 6V, V OUT = 12V
A: LOAD CURRENT, 0mA to 500mA, 500mA/div
B: V
OUT RIPPLE, 100mV/div, AC-COUPLED
A
B
500mA
0A
LOAD-TRANSIENT RESPONSE