Rainbow-electronics MAX1685 Manual do Utilizador descarregar pdf (Página 7)

MAX1684/MAX1685

Low-Noise, 14V Input, 1A, PWM

Step-Down Converters

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Pin Description

Typical Operating Characteristics (continued)

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

5V/div

OUT

100mV/div

2ms/div

LINE-TRANSIENT RESPONSE

MAX1684/85 toc19

MAX1684, I

LOAD

= 100mA, V

= 5V TO 10V,

SYNC/PWM = 3.3V

SHDN

5V/div

50mA/div

10ms/div

STARTUP CURRENT

MAX1684, I

LOAD

= 100mA, V

OUT

= 3.3V,

= 5V, C

ILIM/SS

= 0.1µF, SYNC/PWM = 3.3V

MAX1684/85 toc20

High-Side MOSFET Gate Bias. Bias voltage for P-channel switch. Bypass to IN with a 0.1µF capacitor.CVH1

FUNCTIONNAME

Analog Supply Voltage Input. Connect to IN with a 0.2in metal trace. Bypass to PGND with a 0.1µF

capacitor.

AIN2

Logic Supply Voltage Output and IC Logic Supply. Sources 5mA for external loads. Bypass to AGND

with 1µF capacitor.

CVL4

Supply Voltage InputIN3

Reference Output. 1.25V reference output supplies 10µA for external loads. Bypass to AGND with 0.1µF

capacitor.

REF6

Integrator Capacitor Connection. Connect a 0.01µF capacitor to AGND.CC8

Dual-Mode Feedback Input. Connect FB to V

OUT

for 1.25V output. Connect to an external resistor divider

to adjust the output voltage. Connect to AGND to set output voltage to 3.3V.

FB7

Analog GroundAGND5

Current-Limit Adjust/Soft-Start Input. See the Current Limit and Soft-Start section.ILIM/SS10

Bootstrap Input. Connection for the bootstrap switch and internal feedback path. Connect BOOT to V

OUT

for V

OUT

< 5.5V. Connect BOOT to AGND for V

OUT

> 5.5V.

BOOT12

Standby Control Input. Connect to CVL for normal operation. Connect to AGND for low-power mode

(Table 1). This pin overrides SYNC/PWM setting.

STBY

Active-Low Shutdown Input. Connect to ground for shutdown. SHDN can withstand the input voltage.SHDN

Power GroundPGND16

Inductor Connection. Drain for internal P-channel MOSFETs. Connect inductor from LX to OUT.LX13, 14

SYNC/PWM Input:

For synchronized-PWM operation, drive with TTL level, 50% square wave.

Connect to CVL for PWM mode.

Connect to AGND for normal mode.

SYNC/PWM9

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

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