User Manual

MAX746
High-Efficiency, PWM, Step-Down,
N-Channel DC-DC Controller
_______________________________________________________________________________________ 5
A: LOAD CURRENT, 0.1A TO 1.5A, 1A/div
B: V
OUT
RIPPLE, 50mV/div, AC-COUPLED
V+ = 10V
LOAD-TRANSIENT RESPONSE
A
B
200µs/div
A: EXT VOLTAGE, 10V/div
B: INDUCTOR CURRENT, 500mA/div
C: V
OUT
RIPPLE, 50mV/div, AC-COUPLED
V+ = 6V, I
OUT
= 480mA
A
B
MODERATE-LOAD, IDLE-MODE
WAVEFORMS
20µs/div
C
A: LOAD CURRENT, 0.1A TO 1.5A, 1A/div
B: V
OUT
RIPPLE, 50mV/div, AC COUPLED
V+ = 10V
LOAD-TRANSIENT RESPONSE
A
B
1ms/div
A : EXT VOLTAGE, 20V/div
B : INDUCTOR CURRENT 1A/div
C : V
OUT
RIPPLE, 50mV/div
V+ = 10V, I
OUT
= 3A
CONTINUOUS-CONDUCTION MODE
WAVEFORMS
A
B
C
5µs/div
0V
8V
A: V+ = 8V TO 10V, 2V/div
B: V
OUT
RIPPLE, 100mV/div
I
OUT
= 3A
LINE-TRANSIENT RESPONSE
A
B
10V
500ms/div
A: EXT VOLTAGE, 10V/div
B: INDUCTOR CURRENT, 500mA/div
C: V
OUT
RIPPLE, 50mV/div, AC-COUPLED
V+ = 10V, I
OUT
= 75mA
DISCONTINUOUS-CONDUCTION
IDLE-MODE WAVEFORMS
A
B
20µs/div
C
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1a, T
A
= +25°C, unless otherwise noted.)