Rainbow-electronics MAX744A Manual do Utilizador descarregar pdf (Página 6)

MAX730A/MAX738A/MAX744A

5V, Step-Down,

Current-Mode PWM DC-DC Converters

6 _______________________________________________________________________________________

MAX738A/MAX744A

SWITCHING WAVEFORMS,

CONTINUOUS CONDITION

2µs/div

A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +12V

B: INDUCTOR CURRENT, 200mA/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div, AC-COUPLED

OUT

= 390µF,

V+ = 12V, I

OUT

= 150µA,

MAX738A/MAX744A

SWITCHING WAVEFORMS,

DISCONTINUOUS CONDITION

2µs/div

A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +12V

B: INDUCTOR CURRENT, 200mA/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div, AC-COUPLED

OUT

= 390µF,

V+ = 12V, I

OUT

= 150µA

12V

200mA

0mA

200mA

0mA

MAX730A LINE-TRANSIENT RESPONSE

100ms/div

A: V

OUT

, 50mV/div, DC-COUPLED

B: V+, 5V/div, 6.0V TO 11.0V

OUT

= 300mA

MAX738A/MAX744A LINE-TRANSIENT RESPONSE

100ms/div

A: V

OUT

, 50mV/div, DC-COUPLED

B: V+, 5V/div, 10.2V TO 16.0V

OUT

= 750mA

11V

16V

10.2V

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, T

= +25°C, unless otherwise noted.)

12V

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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