Rainbow-electronics MAX1638 Manual do Utilizador descarregar pdf (Página 5)

MAX1638

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

_______________________________________________________________________________________

FOLDBACK CURRENT LIMIT

MAX1638-04

= 2.0V NOMINAL

A: V

OUT

= 0.5V/div

B: INDUCTOR CURRENT, 5A/div

10µs/div

START-UP WAVEFORMS

MAX1638-05

A: V

OUT

= 0.5V/div

B: INDUCTOR CURRENT, 5A/div

400µs/div

1µs/div

SWITCHING WAVEFORMS

MAX1638-06

= 5V, V

OUT

= 2.5V, LOAD = 5A

A: LX, 5V/div C: INDUCTOR CURRENT,

B: V

OUT

, 20mV/div, AC COUPLED 5A/div

LOAD-TRANSIENT RESPONSE

WITHOUT GLITCHCATCHER (C

OUT

= 880µF)

MAX1638-01

= 5V, V

OUT

= 2.0V, LOAD = 14A, 3A/µs

A: V

OUT

, 50mV/div, AC COUPLED

B: INDUCTOR CURRENT, 10A/div

10µs/div

LOAD-TRANSIENT RESPONSE

WITHOUT GLITCHCATCHER (C

OUT

= 440µF)

MAX1638-02

= 5V, V

OUT

= 2.0V, LOAD = 14A, 3A/µs

A: V

OUT

, 100mV/div, AC COUPLED

B: INDUCTOR CURRENT, 10A/div

10µs/div

LOAD-TRANSIENT RESPONSE

WITH GLITCHCATCHER

MAX1638-03

OUT

= 440µF, V

= 5V, V

OUT

= 2.0V, LOAD = 14A, 30A/µs

A: V

OUT

, 100mV/div, C: NDRV, 5V/div

AC COUPLED D: INDUCTOR CURRENT,

B: PDRV, 5V/div 10A/div

10µs/div

__________________________________________Typical Operating Characteristics

= +25°C, using the MAX1638 evaluation kit, unless otherwise noted.)

100

0.1 10 100

EFFICIENCY vs. OUTPUT CURRENT

MAX1638-07

OUTPUT CURRENT (A)

EFFICIENCY (%)

OUT

= 2.0V

OUT

= 1.3V

OUT

= 3.5V

5.094

1.094

0.001 0.1 10.01 10

REFERENCE VOLTAGE

vs. OUTPUT CURRENT

1.594

2.094

MAX1638-08

OUTPUT CURRENT (mA)

REFERENCE VOLTAGE (V)

2.594

3.594

3.094

4.094

4.594

SOURCING

CURRENT

SINKING

CURRENT

MAXIMUM DUTY CYCLE

vs. SWITCHING FREQUENCY

MAX1638-09

SWITCHING FREQUENCY (kHz)

MAXIMUM DUTY CYCLE (%)

200 800 1000 1200

100

600400

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

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Rainbow-electronics MAX1638 Manual do Utilizador Página 5

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