Rainbow-electronics MAX1801 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX1801

Digital Camera Step-Up Slave

DC-DC Controller

6 _______________________________________________________________________________________

Pin Description

PIN NAME FUNCTION

1 OSC

Oscillator Input. Connect OSC to OSC of the MAX1800 or MAX1802. The oscillator frequency must

be between 100kHz and 1MHz.

2 GND Ground

3 REF

1.25V Reference Input. Connect REF to REF of the MAX1800 or MAX1802. REF must be above 1V

for the controller to turn on. Bypass REF to GND with a 0.1µF or greater capacitor.

4 DCON

Maximum Duty-Cycle Control Input. Connect to REF or IN to set the default maximum duty cycle.

Connect a resistive voltage-divider from REF to DCON to set the maximum duty cycle between 40%

and 90%. Pull DCON below 0.35V to turn the controller off.

5 COMP

Controller Compensation. Output of transconductance error amplifier. Connect a series resistor and

capacitor to GND to compensate the control loop. See Compensation Design.

6 FB

Controller Feedback Input. Connect a feedback resistive voltage-divider from the output to FB to

set the output voltage. Regulation voltage is V

REF

(1.25V).

7 IN

IC Supply Bias Input. Bypass IN to GND with a 0.1µF or greater ceramic capacitor. Supply range is

2.7V to 5.5V.

8 DL

External MOSFET Gate Drive Output. DL swings between IN and GND with typical 500mA drive

current. Connect DL to the gate of the external switching N-channel MOSFET.

STARTUP RESPONSE

MAX1801 toc10

DCON

5V/div

OUT

2V/div

0.5A/div

1ms/div

LOAD TRANSIENT RESPONSE

MAX1801 toc11

OUT

100mV/div

(AC-COUPLED)

400µs/div

LOAD

0.2A/div

= =+2.4V, V

OUT

= +5V, f

OSC

= 500kHz

100mA

500mA

Typical Operating Characteristics (continued)

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

Kommentare zu diesen Handbüchern

Keine Kommentare

Rainbow-electronics MAX1801 Bedienungsanleitung Seite 6

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Rainbow-electronics MAX1801