Rainbow Electronics MAX776 - Manual (Page 7)

MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I
Q
Inverting DC-DC Controllers
_______________________________________________________________________________________ 7
__________________________________________Typical Operating Characteristics
(T A = +25°C, unless otherwise noted.)
CIRCUIT OF FIGURE 2
V+ = 6.5V, I
LOAD = 1A, V OUT = -5V
A: OUTPUT RIPPLE, 200mV/div
B: EXT WAVEFORM, 10V/div
C: INDUCTOR CURRENT, 2A/div
OPERATING WAVEFORMS
10 µ s/div
A
B
C
CIRCUIT OF FIGURE 2
V
OUT = -5V, V+ = 4.7V
I LOAD = 1.05A (1A/div)
INDUCTOR CURRENT NEAR FULL LOAD
20 µ s/div
1A/div
0A
CIRCUIT OF FIGURE 2
I
LOAD = 300mA, V OUT = -5V
V+ = 8V, L = 22 µ H
CONTINUOUS CONDUCTION
AT ONE-HALF CURRENT LIMIT
20 µ s/div
1A/div
0A
CIRCUIT OF FIGURE 2
V+ = 6V, I
LOAD = 1A, V OUT = -5V
A: SHUTDOWN PULSE, 0V TO V+, 5V/div
B: V
OUT , 2V/div
ENTRY/EXIT FROM SHUTDOWN
2ms/div
A
B