Rainbow-electronics MAX887 Manual de usuario descargar pdf (Pagina 6)

MAX887

100% Duty Cycle, Low-Noise,

Step-Down, PWM DC-DC Converter

6 _______________________________________________________________________________________

_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2, T

= +25°C, unless otherwise noted.)

40µs/div

LOAD-TRANSIENT RESPONSE

= 5V, V

OUT

= 3.3V, 

LOAD = 0mA TO 500mA, PWM MODE

A: LX, 5V/div

B: V

OUT

, 50mV/div, AC COUPLED

C: LOAD CURRENT, 500mA/div



MAX887-16

200µs/div

LINE-TRANSIENT RESPONSE

= 5V TO 11V, V

OUT

= 3.3V, 

LOAD = 500mA, PWM MODE

A: V

, 5V/div

B: V

OUT

, 20mV/div, AC COUPLED



MAX887-17

200µs/div

RECOVERY FROM 100% DUTY CYCLE

(DROP OUT)

= 3.3V TO 11V, V

OUT

= 3.3V, 

LOAD = 500mA, PWM MODE

A: V

, 5V/div

B: V

OUT

, 50mV/div, AC COUPLED

C: LX, 10V/div



MAX887-18

500µs/div

SHUTDOWN AND STARTUP RESPONSE

= 5V, V

OUT

= 3.3V, 

LOAD = 100mA, PWM MODE

A: SHDN, 5V/div

B: V

OUT

, 2V/div, AC COUPLED

C: LX, 5V/div

D: INDUCTOR CURRENT, 500mA/div



MAX887-19

1 2 3 4 5 6 7 8 9 10 11 12

100% Duty Cycle, Low-Noise 1

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Rainbow-electronics MAX887 Manual de usuario Pagina 6

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