zxct1032 Zetex Semiconductors plc., zxct1032 Datasheet

zxct1032

Manufacturer Part Number

zxct1032

Description

Zxct1032 - High-side Inrush And Current Limit Controller

Manufacturer

Zetex Semiconductors plc.

Datasheet

1.ZXCT1032.pdf (10 pages)

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ZXCT1032

High-side inrush controller and electronic fuse

Description

The ZXCT1032 is a high-side current monitor

that drives a PMOS or PNP transistor to

provide in-rush current limit and over-current

protection. The ZXCT1032 includes a high

accuracy high-side current monitor, a start-up

timer and a re-try inhibit timer.

The ZXCT1032 takes the voltage developed

across a current shunt resistor and compares

this with an externally set trip point. It works

in three modes:

•

Linear soft-start

Upon power up the ZXCT1032 enters a linear

soft-start mode. During which the output

current ramps up from zero to a maximum

user defined trip point. The trip point is set by

the voltage on I

The ramp rate is determined by capacitor C

The soft start ensures that capacitive loads are

smoothly charged without causing excessive

power supply startup transients.

Over-current detectior

When external capacitor CT has charged up

above the V

soft-start mode to its over-current detection

mode. During this mode the external MOSFET

will be fully enhanced reducing the its voltage

drop and power dissipation.

Features

•

Ordering information

Issue 4 - June 2007

Order code

ZXCT1032N8TA

Linear soft-start

Over-current detector

Over-current disconnect/fuse

Accurate high-side current sensing

User defined and dynamically adjustable

trip current

Load switch control

Fault flag logic output

User defined ramp and inhibit timers

SO8 package

Temperature range -40 to 85°C

ISET

the ZXCT1032 switches from its

SET

pin and R

Pack

SO8

SENSE

Part mark

1032

Reel size

While in this mode the internal current monitor

continually checks the output current and

compares it to the trip-current level determined

by V

Over-current disconnect/fuse

If the trip current limit is exceeded at any time the

ZXCT1032 enters its Over-current disconnect

mode. The drive pin is driven high, turning the

pass MOSFET off; the flag output goes low

indicating a fault.

The drive and flag outputs are latched in these

states for a period determined by C

internally set discharge current (3µA typical). After

restart into its linear soft-start mode.

The C

ratioed to so that the power dissipation in the

pass MOSFET should allow indefinite operation

in the event of a continuous load failure.

Pin 3 description:

Determines the load current trip level or

constant current level. ISET can be left open

circuit (internal 2.1V reference) or driven via a

DC voltage or µC PWM output. Its source

impedance is 50k .

Applications

•

7”

Electronic fuse

Short circuit protected supply feed

Hot swap

Power over twisted pair

has discharged to 80mV the ZXCT1032 will

ISET

charge and discharge times have been

Tape width

12mm

Quantity per reel

www.zetex.com

500

, V

ISET

and the

Related parts for zxct1032

zxct1032 Summary of contents

Page 1

... Linear soft-start • Over-current detector • Over-current disconnect/fuse Linear soft-start Upon power up the ZXCT1032 enters a linear soft-start mode. During which the output current ramps up from zero to a maximum user defined trip point. The trip point is set by the voltage on I pin and R ...

Page 2

... IN- The load referred input to the current monitor control loop. 7 N/C Not connected 8 IN+ Acts as both the supply pin to the ZXCT1032 and the supply referred sense input to the current monitor control loop. Issue 4 - June 2007 © Zetex Semiconductors plc 2007 6 IN- 5 Drive ...

Page 3

... ISET SENSE = 2.1V, V > 205mV ISET SENSE I = 100µA FLAG V = 2.1V, V < 185mV, ISET SENSE FLAG ISET (†) See footnote FLAG = Open FLAG = Low 3 ZXCT1032 +0 ................ 500 mV Min. Max. Units 9 IN+ 1 2.5 Min. Typ. Max. Units 1.6 2.5 95 185 195 205 2.0 2 ...

Page 4

... V =9.5V IN+ V =20V 35 IN+ V =21V IN ZXCT1032 Quiescent current vs input voltage Input voltage V vs input voltage ISET Input voltage ( input voltage 25° Input voltage (V) www ...

Page 5

... Issue 4 - June 2007 © Zetex Semiconductors plc 2007 -206 9.5 to 21V IN+ -207 -207.5 -208 3.75 3.74 3.73 3.72 3.71 3. ZXCT1032 I vs input voltage CT-CHG T = 25° Input voltage ( input voltage CT-DIS T =25° Input voltage (V) www ...

Page 6

... Application information ZXCT1032 block diagram and description R SENSE (8) IN+ I CT-CHG 200 A (3) I SET ( DIS - 3 GND (1) Operation of the ZXCT1032 1 After power-up, the timing capacitor (C 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 C increases ...

Page 7

... The ZXCT1032 has now entered its over-current detector mode effectively “transparent” to the load until the current monitor output exceeds the trip point. 3 Fuse operation is provided by the trip comparator whose threshold voltage is set by V (internally nominally 2.1V, although this threshold can easily be overdriven). As the load current increases, so does the monitor voltage ...

Page 8

... The current monitor has an intentional output offset of +150mV the trip comparator will be permanently high and the output will be completely disabled. Issue 4 - June 2007 © Zetex Semiconductors plc 2007 is held at 0V, the output ISET 8 ZXCT1032 www.zetex.com ...

Page 9

... Note: Controlling dimensions are in inches. Approximate dimensions are provided in millimeters Issue 4 - June 2007 © Zetex Semiconductors plc 2007 Millimeters DIM Min. Max. 1.35 1.75 e 0.10 0.25 b 4.80 5.00 c 5.80 6.20 3.80 4.00 h 0.40 1. ZXCT1032 Inches Millimeters Min. Max. Min. 0.050 BSC 1.27 BSC 0.013 0.020 0.33 0.008 0.010 0.19 0° 8° 0° 0.010 0.020 0. www.zetex.com Max. ...

Page 10

... Zetex Semiconductors plc 3701-04 Metroplaza Tower 1 Zetex Technology Park, Chadderton Hing Fong Road, Kwai Fong Oldham, OL9 9LL Hong Kong United Kingdom Telephone: (852) 26100 611 Telephone: (44) 161 622 4444 Fax: (852) 24250 494 Fax: (44) 161 622 4446 asia.sales@zetex.com hq@zetex.com 10 ZXCT1032 www.zetex.com ...

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