ZXCT1032N8TA View Datasheet(PDF) - Diodes Incorporated.

Part Name

Description

Manufacturer

ZXCT1032N8TA

High-side inrush controller and electronic fuse

Diodes Incorporated. 

ZXCT1032

Application information

ZXCT1032 block diagram and description

R SENSE

(8)

(6)

IN+

IN-

+-

NC

ICT-CHG

200␮A

(3) ISET

(2)

CT ICT-DIS 50k⍀

CT

3.3␮A 2.1V

GND

(1)

ZXCT1032

+

-

+

-

+

-

80mV

Drive (5)

Load

Flag

(4)

Operation of the ZXCT1032

1 After power-up, the timing capacitor (CT) is charged up by a 200µA current source. This causes

the output amplifier's drive pin to fall in voltage, progressively turning on the PMOS transistor.

The load current is monitored by the current monitor and the amplifier control loop controls

the load current allowing it to increase gradually (soft-start mode) as the voltage on CT

increases. During the soft-start phase the load current will start to build up while there is a

large voltage across the pass MOSFET; this can lead to large power dissipation if large

capacitive loads are driven and/or large CT is used.

3

VIN+ = 18V

RSENSE = 0.2⍀

2.5 CT = 220nF

VISET = 2.1V

Trip current = 1A

2

ZXCT1032 Start up characteristic

VISET

1.2

VCT

1

0.8

1.5

ILOAD

0.6

1

0.4

10*VSENSE

0.5

0.2

0

0

0

0.5

1

1.5

2

2.5

time - ms

Issue 3 - April 2007

6

© Zetex Semiconductors plc 2007

www.zetex.com

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