Rainbow-electronics MAX1804 Manual do Utilizador descarregar pdf (Página 5)

MAX1804

External Four-Input Feedback Integrator for

Power Supplies

_______________________________________________________________________________________ 5

CH1 = I

LOAD

; 1.00A/div

CH5 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 1000pF)

CH4 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 470pF)

CH3 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 220pF)

CH2 = V

IN1

; 500mV/div; AC-COUPLED (MAX1804 DISABLED)

(MAX1653) = 8V

100

s/div

CH1

CH5

CH4

CH3

CH2

MAX1804toc07

LOAD TRANSIENT RESPONSE

(APPLICATION CIRCUIT OF FIGURE2)

CH1 = I

LOAD

; 500mA/div

CH2 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 0.047

CHR4 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 1000pF)

CHR3 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 2200pF)

CHR2 = V

IN1

; 500mV/div; AC-COUPLED (C

COMP

= 4700pF)

CHR1 = V

IN1

; 500mV/div; AC-COUPLED (MAX1804 DISABLED)

(MAX603) = 8V

NOTE: Circuit of Figure 3.

400

s/div

0.5

0.01

CH1

CH2

CHR4

CHR3

CHR2

CHR1

MAX1804toc08

LOAD TRANSIENT RESPONSE

CH1 = SHDN, 2V/div

CH2 = V

IN2

; 200mV/div; DC OFFSET = 4.7V

LOAD

0.5A

(MAX1653) = 8V

NOTE: Circuit of Figure 2.

200µs/div

CH1

CH2

MAX1804toc09

STARTUP/SHUTDOWN WAVEFORM

CHR1 = V

G(PFET)

; 5V/div

CH1 = V

IN1

; 200mV/div; DC OFFSET = 4.8V

CH2 = V

IN2

; 2V/div

(MAX1653) = 8V

NOTE: Circuit of Figure 2.

200

s/div

CHR1

CH1

CH2

MAX1804toc10

AUTOMATIC INPUT DISABLE WAVEFORM

IN2 ENABLE

IN2 DISABLE IN2 DISABLE

Typical Operating Characteristics (continued)

+ = V

SHDN

= 3.3V, V

ADJ

= 1.2V, V

OUT

= 2V, C

COMP

= 470pF, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11

Power Supplies 1

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