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ZXCT1032 데이터시트 PDF




Zetex Semiconductors에서 제조한 전자 부품 ZXCT1032은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 ZXCT1032 기능
기능 High-side inrush controller and electronic fuse
제조업체 Zetex Semiconductors
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ZXCT1032 데이터시트, 핀배열, 회로
www.DataSheet4U.com
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
• 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 ISET pin and RSENSE.
The ramp rate is determined by capacitor CT.
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 VISET the ZXCT1032 switches from its
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
• 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
While in this mode the internal current monitor
continually checks the output current and
compares it to the trip-current level determined
by VISET.
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 CT, VISET and the
internally set discharge current (3µA typical). After
CT has discharged to 80mV the ZXCT1032 will
restart into its linear soft-start mode.
The CT charge and discharge times have been
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
• Electronic fuse
• Short circuit protected supply feed
• Hot swap
• Power over twisted pair
Ordering information
Order code
Pack
ZXCT1032N8TA SO8
Part mark
1032
Reel size
7”
Tape width
12mm
Quantity per reel
500
Issue 3 - April 2007
© Zetex Semiconductors plc 2007
1
www.zetex.com




ZXCT1032 pdf, 반도체, 판매, 대치품
ZXCT1032
Typical characteristics
(TA = 25°C and VIN+ = 20V unless otherwise stated)
Quiescent current vs temperature
0.90
VIN+= 9.5 to 21V
Quiescent current vs input voltage
0.80
0.60
0.79
0.30
0.78
0.00
-40
2.20
2.15
-15 10 35 60
Temperature (C)
VISET vs temperature
VIN+ = 9.5 to 21V
0.77
85 9
11
2.101
TA = 25°C
13 15 17
Input voltage
VISET vs input voltage
19
21
2.10
2.05
2.100
2.00
-40
50
45
40
35
30
25
20
15
10
5
0
-40
-15 10 35 60
Temperature (°C)
IIN- vs temperature
VIN+=9.5V
VIN+=20V
VIN+=21V
-15 10 35 60
Temperature (°C)
2.099
85 9
40
35
10 11 12 13 14 15 16 17 18 19 20 21
Input voltage (V)
IIN- vs input voltage
TA = 25°C
30
25
20
15
10
5
0
85 9
11 13 15 17 19 21
Input voltage (V)
Issue 3 - April 2007
© Zetex Semiconductors plc 2007
4
www.zetex.com

4페이지










ZXCT1032 전자부품, 판매, 대치품
ZXCT1032
2 The output voltage also increases due to the load current powering up the load and charging
any capacitance. After the initial soft start (load current stabilizing) the timing capacitor
charges up to 4V and the device enters its normal mode of operation. The external MOSFET
will be now fully enhanced minimizing any serial voltage drop.
20
18
16
14
12
10
8
6
4
2
0
0
VLOAD
ZXCT1032 Normal Operation
1
0.8
ILOAD
VISET
VCT
10*VSENSE
5 10
Time ms
VIN+ = 18V
RSENSE = 0.2Ω
CT = 220nF
VISET = 2.1V
Trip current = 1A
0.6
0.4
0.2
0
15 20
The ZXCT1032 has now entered its over-current detector mode; it is 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 VISET
(internally nominally 2.1V, although this threshold can easily be overdriven). As the load
current increases, so does the monitor voltage. When the current monitor output voltage
exceeds VISET, the trip comparator output goes high and sets the latch with the following
results:
a The output drive is disabled.
b The open collector Flag output goes low to indicate a fault condition.
c The 200A current source is turned off and CT starts to discharge slowly via a 3.3A current
source.
ZXCT1032 Timing in over-current condition
2.5 2.5
VISET
22
VIN+
= 18 V
RSENSE = 0.2 ?
1.5
ILOAD
>1A
1.5
VCT CT = 220 nF
VISET = 2.1 V
Trip current = 1 A
11
0.5
ILOAD
0
0
50 100
Time (ms)
0.5
0
150
Issue 3 - April 2007
© Zetex Semiconductors plc 2007
7
www.zetex.com

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