Rainbow-electronics MAX8715 Manual do Utilizador descarregar pdf (Página 6)

500mA

20mA

CH1 = LOAD CURRENT, 500mA/div

CH2 = OUTPUT VOLTAGE, AC-COUPLED, 200mV/div

CH3 = INDUCTOR CURRENT, 1A/div

OUT

= 5V, f

OSC

= 640kHz, C

OUT

= 47

F + 0.1

100

s/div

MAX1790 LOAD-TRANSIENT RESPONSE

MAX1790 toc10

CH1

CH2

CH3

COMP

= 62k

Ω

COMP

= 820pF

COMP2

= 56pF

100

s/div

MAX1790 STARTUP WAVEFORM

WITHOUT SOFT-START

MAX1790 toc11

CH1

CH2

CH3

CH1 = SHDN, 5V/div

CH2 = OUTPUT VOLTAGE, 5V/div

CH3 = INDUCTOR CURRENT, 1A/div

= 3.3V, V

OUT

= 12V, I

OUT

= 10mA, f

OSC

= 640kHz

NO SOFT-START CAPACITOR, C

OUT

= 33

1ms/div

STARTUP WAVEFORM

WITH SOFT-START

MAX1790 toc12

CH1

CH2

CH3

CH1 = SHDN, 5V/div

CH2 = OUTPUT VOLTAGE, 5V/div

CH3 = INDUCTOR CURRENT, 200mA/div

OUT

= 12V, I

OUT

= 10mA, f

OSC

= 640kHz,

= 0.027

F, C

OUT

= 33

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= 3.3V, f

OSC

= 640kHz, T

= +25°C, unless otherwise noted.)

200mA

10mA

CH1

CH2

CH3

CH1 = LOAD CURRENT, 200mA/div

CH2 = OUTPUT VOLTAGE, AC-COUPLED, 100mV/div

CH3 = INDUCTOR CURRENT, 500mA/div

= 3.3V, V

OUT

= 9.0V

OSC

= 1.2MHz, L = 6.8

H, C

OUT

= 3 x 3.3

s/div

MAX8715 LOAD-TRANSIENT RESPONSE

MAX1790 toc07

COMP

= 82k

Ω

COMP

= 750pF

COMP2

= 10pF

40mA

CH1

CH2

CH3

CH1 = LOAD CURRENT, 1A/div

CH2 = OUTPUT VOLTAGE, AC-COUPLED, 100mV/div

CH3 = INDUCTOR CURRENT, 500mA/div

= 3.3V, V

OUT

= 9.0V

OSC

= 1.2MHz, L = 6.8

H, C

OUT

= 3 x 3.3

s/div

MAX8715

PULSED LOAD-TRANSIENT RESPONSE

MAX1790 toc08

200mA

10mA

CH1

CH2

CH3

CH1 = LOAD CURRENT, 100mA/div

CH2 = OUTPUT VOLTAGE, AC-COUPLED, 200mV/div

CH3 = INDUCTOR CURRENT, 1A/div

= 3V

OUT

= 12V, f

OSC

= 640kHz, C

OUT

= 33

F + 0.1

100

s/div

MAX1790 LOAD-TRANSIENT RESPONSE

MAX1790 toc09

COMP

= 120k

Ω

COMP

= 1200pF

COMP2

= 56pF

MAX1790/MAX8715

Low-Noise Step-Up DC-DC Converters

6 _______________________________________________________________________________________

1 2 3 4 5 6 7 8 9 10 11 12 13 14

MAX1790/MAX8715 1

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