Rainbow-electronics MAX776 Bedienungsanleitung PDF herunterladen (Seite 8)

MAX774/MAX775/MAX776

-5V/-12V/-15V or Adjustable,

High-Efficiency, Low I

Inverting DC-DC Controllers

8 _______________________________________________________________________________________

______________________________________________________________Pin Description

PIN NAME FUNCTION

1 OUT

2 FB

3 SHDN

4 REF

1.5V reference output that can source 100µA. Bypass to ground with 0.1µF.

5 V+ Positive power-supply input

6 CS Noninverting input to the current-sense comparator. Typical trip level is 210mV (relative to V+).

7 EXT The gate-drive output for an external P-channel power MOSFET. EXT swings from OUT to V+.

8 GND Ground

The sense input for fixed-output operation (V

= V

REF

). OUT is connected to the internal voltage divider,

and it is the negative supply input for the EXT driver.

Feedback input. When V

= V

REF

, the output will be the factory preset value. For adjustable operation,

use an external voltage divider, as described in the

Adjustable Output

section.

Active-high shutdown input. With SHDN high, the part is in shutdown mode and the supply current is less

than 5µA. Connect to GND for normal operation.

____________________________Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

CIRCUIT OF FIGURE 2

V+ = 6V, V

OUT

= -5V

A: I

LOAD

, 30mA TO 1A, 1A/div

B: V

OUT

, 100mV/div, AC-COUPLED

LOAD-TRANSIENT RESPONSE

100µs/div

CIRCUIT OF FIGURE 2

OUT

= -5V, I

LOAD

= 1A

A: V+, 3V TO 8V, 5V/div

B: V

OUT

, 100mV/div, AC-COUPLED

LINE-TRANSIENT RESPONSE

2ms/div

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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