ACT6390(2007) Ver la hoja de datos (PDF) - Active-Semi, Inc

Número de pieza

componentes Descripción

Fabricante

ACT6390
(Rev.:2007)

1.7A/2.5A PWM Step-Up DC/DC Converters In MSOP

Active-Semi, Inc 

fZ ESR



2π

1

 33μF

 0.5 Ω



9.64kHz

(31)

fZ(ESR) < fC

CCOMP2



RESR COUT

RCOMP



0.5Ω 33μF

233kΩ

 70.8pF

Choose CCOMP2 = 82pF

(32)

Rectifier Selection

For optimal performance, the rectifier should be a

Schottky rectifier that is rated to handle both the

output voltage as well as the peak switch current.

Over Voltage Protection

The ACT6390 and ACT6391 both feature internal

automatic over-voltage protection (OVP). Once the

outputs achieve regulation, if the voltage at FB falls

below 0.125V the controller will automatically dis-

able and latch off, preventing the controller from

running open-loop and potentially damaging the IC

and load.

To re-enable the converters, simply cycle the EN

pin or remove and reapply power to the input.

Shutdown

Drive EN low to disable the IC and reduce the sup-

ply current to just 0.1µA. As with all non-

synchronous step-up DC/DC converters, the exter-

nal Schottky diode provides a DC path from the in-

put to the output in shutdown. As a result, the out-

put drops to one diode voltage drop below the input

in shutdown.

Thermal Shutdown

The ACT6390 and ACT6391 both feature integrated

thermal overload protection. Both devices are auto-

matically disabled when their junction temperatures

exceed 160°C, and automatically re-enable when

the die temperature decreases by 20°C.

ACT6390/ACT6391

Rev PrA, 01-Sep-07

Innovative Products. Active Solutions.

-8-

www.active-semi.com

Copyright © 2007 Active-Semi, Inc.

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