Rainbow-electronics MAX1800 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX1800

Digital Camera Step-Up

Power Supply

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

INPUT

= 2.4V, T

= +25°C, unless otherwise noted.)

100

0.4 0.6 0.70.5 0.8 0.9 1.0 1.1 1.2

AUXILIARY CONTROLLER

MAXIMUM DUTY CYCLE vs. V

DCON

MAX1800 toc07

DCON

_ (V)

MAXIMUM CYCLE (%)

1 10010 1000 10,000

FB_ TO COMP_ SMALL-SIGNAL OPEN-LOOP

FREQUENCY RESPONSE

MAX1800 toc08

FREQUENCY (kHz)

SMALL-SIGNAL RESPONSE (dB)

OSCILLATOR FREQUENCY vs. R

OSC

1 100010010

1000

400

200

800

600

MAX1800 toc10

OSC

(kΩ)

OSCILLATOR FREQUENCY (kHz)

OSC

= 470pF

OSC

= 220pF

OSC

= 100pF

OSC

= 47pF

LDO STARTUP RESPONSE

MAX1800 toc12

1.00 ms/div

INPUT

CURRENT

500mA/div

LDO

OUTPUT

VOLTAGE

2V/div

ONA

2V/div

MAIN LOAD = 24Ω

LDO LOAD = 8Ω

100

0 400200 600 800 1000

MAX1800 toc09

FREQUENCY (kHz)

DEFAULT MAXIMUM DUTY CYCLE (%)

AUXILIARY CONTROLLER DEFAULT

MAXIMUM DUTY CYCLE vs. FREQUENCY

OSC

= 470pF

MAIN OUTPUT STARTUP RESPONSE

MAX1800 toc11

1.00 ms/div

INPUT

CURRENT

1A/div

MAIN

OUTPUT

VOLTAGE

2V/div

ONM

2V/div

MAIN LOAD = 24Ω

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

Digital Camera Step-Up 1
Power Supply 1

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