Rainbow-electronics MAX747 Manuel d'utilisateur télécharger pdf (Page 4)

MAX747

High-Efficiency PWM, Step-Down

P-Channel DC-DC Controller

4 _______________________________________________________________________________________

CONTINUOUS-CONDUCTION MODE WAVEFORMS

MAX747-SCOPE1

5µs/div

V+ = 9V, I

OUT

= 2.5A

a) EXT VOLTAGE, 10V/div

b) INDUCTOR CURRENT, 1A/div

c) V

OUT

RIPPLE, 50mV/div

DISCONTINUOUS-CONDUCTION IDLE-MODE WAVEFORMS

MAX747-SCOPE2

20µs/div

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)

LINE-TRANSIENT RESPONSE

MAX747-SCOPE4

5ms/div

OUT

= 2.0A

a) V+ = 6V to 12V, 5V/div

b) V

OUT

RIPPLE, 100mV/div

LOAD-TRANSIENT RESPONSE

MAX747-SCOPE5

100µs/div



V+ = 9V, C

OUT

= 430µF

a) LOAD CURRENT, 0.1A TO 2.5A, 1A/div

b) V

OUT

RIPPLE, 100mV/div

MODERATE LOAD, IDLE-MODE WAVEFORMS

MAX747-SCOPE3

5µs/div

V+ = 9V, I

OUT

= 560mA

a) EXT VOLTAGE, 5V/div

b) INDUCTOR CURRENT, 0.5A/div

c) V

OUT

RIPPLE 100mV/div

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P-Channel DC-DC Controller 1

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Rainbow-electronics MAX747 Manuel d'utilisateur Page 4

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