Rainbow Electronics MAX747 - Manual (Page 4)

MAX747
High-Efficiency PWM, Step-Down
P-Channel DC-DC Controller
4 _______________________________________________________________________________________
a
CONTINUOUS-CONDUCTION MODE WAVEFORMS
c
MAX747-SCOPE1
5 µ s/div
b
V+ = 9V, I OUT = 2.5A
a) EXT VOLTAGE, 10V/div
b) INDUCTOR CURRENT, 1A/div
c) V
OUT RIPPLE, 50mV/div
a
DISCONTINUOUS-CONDUCTION IDLE-MODE WAVEFORMS
c
MAX747-SCOPE2
20 µ s/div
b
V+ = 9V, I OUT = 125mA
a) EXT VOLTAGE, 10V/div
b) INDUCTOR CURRENT, 200mA/div
c) V
OUT RIPPLE, 50mV/div
____________________________Typical Operating Characteristics (continued)
a
LINE-TRANSIENT RESPONSE
MAX747-SCOPE4
5ms/div
b
I OUT = 2.0A
a) V+ = 6V to 12V, 5V/div
b) V
OUT RIPPLE, 100mV/div
a
LOAD-TRANSIENT RESPONSE
MAX747-SCOPE5
100µs/div
b
V+ = 9V, C OUT = 430 µ F
a) LOAD CURRENT, 0.1A TO 2.5A, 1A/div
b) V
OUT RIPPLE, 100mV/div
a
MODERATE LOAD, IDLE-MODE WAVEFORMS
c
MAX747-SCOPE3
5 µ s/div
b
V+ = 9V, I OUT = 560mA
a) EXT VOLTAGE, 5V/div
b) INDUCTOR CURRENT, 0.5A/div
c) V
OUT RIPPLE 100mV/div