Rainbow-electronics MAX887 Uživatelský manuál stáhnout pdf (Strana 5)

MAX887

100% Duty Cycle, Low-Noise,

Step-Down, PWM DC-DC Converter

_______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2, T

= +25°C, unless otherwise noted.)

= 5V, V

OUT

= 3.3V, LOAD = 500mA

A: LX, 5V/div

B: V

OUT

, 20mV/div, AC COUPLED

C: INDUCTOR CURRENT, 500mA/div



1µs/div

HEAVY-LOAD, PWM-MODE 

SWITCHING WAVEFORMS

0mA



MAX887-12

= 5V, V

OUT

= 3.3V, LOAD = 0mA

A: LX, 5V/div

B: V

OUT

, 20mV/div, AC COUPLED

C: INDUCTOR CURRENT, 500mA/div



1µs/div

LIGHT-LOAD, PWM-MODE 

SWITCHING WAVEFORMS



MAX887-13

= 5V, V

OUT

= 3.3V, LOAD = 0mA

A: LX, 5V/div

B: V

OUT

, 20mV/div, AC COUPLED

C: INDUCTOR CURRENT, 200mA/div



1µs/div

LIGHT-LOAD, PFM-MODE 

SWITCHING WAVEFORMS



MAX887-14

= 5V, V

OUT

= 3.3V, LOAD = 70mA

A: LX, 5V/div

B: V

OUT

, 20mV/div, AC COUPLED

C: INDUCTOR CURRENT, 200mA/div



10µs/div

MEDIUM-LOAD, PFM-MODE 

SWITCHING WAVEFORMS



MAX887-15

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

100% Duty Cycle, Low-Noise 1

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