High Voltage Current
Regulators
Preliminary Data Sheet
The IXYS IXC series of high voltage
current regulators consists of non-
switchable, 2-terminal, AC and DC
current regulators.
IXC Series
V
AK
=
450
V
I
A(P)
= 2 - 60 mA
Ω
R
DYN
= 9 - 900 kΩ
TO-220 AB
(IXCP)
4
4
1
3
12
AC non-switchable regulators
This family consists of two DC current
regulators connected internally in
series to regulate the current to a
specified value in both directions. Its
output characteristics in quadrants 1
and 3 are the same as shown in Figure
1 so that the current regulation is also
the same in both directions. Parts are
only available in the TO-220 package.
Current Regulator Nomenclature
Parts can be ordered by using the following
nomenclature:
TO-252 AA
(IXCY)
3
Fig. 1. Current Regulator Output
Characteristics
Non-switchable regulators
This is a family of extremely stable,
high voltage current regulators with
the typical output characteristic shown
in Figure 1. The temperature stability
is based on a threshold compensation
technique and uses IXYS' most
recently developed high voltage
process. The complete family will be
capable of providing other
intermediate current levels which can
be programmed on-chip during the
manufacturing phase.
Specific applications are current
sourcing in PABX applications,
telephone line terminations, surge
protection and voltage supply
protection. Two devices in a back-to-
back configuration will give
bidirectional operation. Specific
bidirectional applications would be
series surge protection and soft start-
up applications from AC mains.
Features
Extremely stable current character-
istics
(±50
ppm/K)
Minimum of 450 V breakdown
Easily configured for bidirectional
current sourcing
40 W continuous dissipation
International standard packages
JEDEC TO-220 and TO-252
IXCP10M45A
IX
C
P
Y
10
M
45
(Example)
IXYS
Current Regulator
Package style
TO-220 AB
TO-252 (D-PAK)*
Current Rating,
10 = 10 mA
Current Level
A = Amps, M = mA,
U =
µA
Voltage rating
45 = 450 V
Applications
PABX current sources
Telephone line terminations in
PABXs and modems
Highly stable voltage sources
Surge limiters and voltage protection
(DC and AC)
Instantaneously reacting resetable
fuses
Waveform synthesizers
Soft start-up circuits
Fig. 2. Block diagram for the non-switchable regulator
© 2004 IXYS All rights reserved
1
DS98703A (7/04)
IXC Series
Non-Switchable DC Current Regulators
Symbol
V
AK
P
D
I
RM
T
J
T
stg
T
L
M
D
Definition
Drain Source Voltage
Power Dissipation
(T
C
= 25°C)
IXC_02M to IXC_50M
IXC_60M & IXC_100M
Maximum Ratings
450
25
40
1
-55 to +150
-55 to +150
260
V
W
W
A
°C
°C
°C
TO-220 AB Outline
Maximum Reverse Current
Junction Operating Temperature
Storage Temperature
Temperature for soldering (max. 10 s)
Mounting torque with screw M3 (TO-220)
with screw M3.5 (TO-220)
Definition/Condition
0.45/4 Nm/lb.in.
0.55/5 Nm/lb.in.
Symbol
Characteristic Values
(T
J
= 25°C, unless otherwise specified)
min.
typ.
max.
450
1.9
9.0
18
36
45
56
88
V
AK
= 10 V
800
160
78
19
15
8
2.0
10
20
40
50
60
100
±50
900
180
85
21
17
9
1.8
2.5
11.8
22
44
55
64
110
V
mA
mA
mA
mA
mA
mA
mA
ppm/K
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
V
Dim.
A
A1
A2
b
b1
b2
c
c1
D
D1
E
E1
e
e1
H
L
L1
L2
L3
Millimeter
Min. Max.
2.19 2.38
0.89 1.14
0 0.13
0.64 0.89
0.76 1.14
5.21 5.46
0.46 0.58
0.46 0.58
5.97 6.22
4.32 5.21
6.35 6.73
4.32 5.21
2.28 BSC
4.57 BSC
9.40 10.42
0.51 1.02
0.64 1.02
0.89 1.27
2.54 2.92
Inches
Min.
Max.
0.086
0.035
0
0.025
0.030
0.205
0.018
0.018
0.235
0.170
0.250
0.170
0.090
0.180
0.370
0.020
0.025
0.035
0.100
0.094
0.045
0.005
0.035
0.045
0.215
0.023
0.023
0.245
0.205
0.265
0.205
BSC
BSC
0.410
0.040
0.040
0.050
0.115
BV
AK
*
I
A(P)
Breakdown
voltage:
Plateau
Current
__M45 I
D
= 1.5 I
A(P)
02M__ V
AK
= 10 V
10M__
20M__
40M__
50M__
60M__
100M__
TO-252 AA Outline
∆
∆
I
A(P)
/∆T
∆
∆
V
AK
/∆ I
A(p)
Plateau Current Shift
with Temperature
Dynamic
Resistance
02M__ V
AK
= 10 V
10M__
20M__
50M__
60M__
100M__
V
F
R
thJC
R
thJA
Diode forward voltage drop; I
F
= 50mA
Thermal Resistance junction-to-case
IXC_02M to IXC_50M 5.0 K/W
IXC_60M & IXC_100M 3.1 K/W
Thermal Resistance junction-to-ambient TO-220
80 K/W
TO-252
100 K/W
* Pulse test to limit power dissipation to within device capability.
Pin connections
1 = No connection
2, 4 = Positive terminal A
3 = Negative terminal K
Product Marking
TO-220 types - full part number
TO-252 - last 7 alpha-numeric characters of the
part number, e.g. CY02M45
2
IXC Series
Application Examples
DC and AC Overvoltage
Suppression
The regulator can be used as a
voltage surge suppressor. The device
is again connected in series with the
lead (Fig. 5) and would normally
operate at a current level lower than
the plateau (Fig. 6a). Any incoming
voltage surge (Fig. 6b) less than the
breakdown voltage of the regulator will
be clamped by the IXCP regulator to
voltage less than the plateau current
times the effective resistance of the
load.
Fig. 5. DC surge suppression
source of a highly stable current to
produce a usable voltage reference
(Fig. 7). This would be effectively
independent of temperature and a low
cost approach. A high voltage
reference is also possible, thanks to
their high breakdown voltages.
Fig.8. Low cost current regulators
instead of fuses
The obvious advantages to having this
regulator as fuse substitute are:
Prevents a "dip" in the power
supply during a fault condition
Regulator remains intact
Can be easily tied in with logic to
indicate a "down state" board
R = 100
Ω
R = 50
Ω
R = 25
Ω
V
out
= 3.5 V nominal
V
out
= 1.75 V nominal
V
out
= 0.875 V nominal
Fig. 6a. DC surge suppression
Fig. 7. Simple voltage source with
high stability
Instantaneous "Fuse"
Another application would be
protection against sudden voltage
droops on voltage supply lines to logic
cards in computing systems, resulting
from one component suddenly
shorting to ground. Normal fusing
networks will draw considerable
current during the time it takes for the
fuse to clear. This could cause a
sufficient dip in power rail voltage to
cause malfunctions of the other logic
cards, even with fast-blow fuses (Fig.
8). The current regulator in series with
the logic card restricts the current to
its own operating level (Fig. 9).
Therefore the voltage supply does not
become overloaded and the regulator
remains intact.
The current regulator thus provides an
"instantaneous fusing" function. When
the logic component is replaced, the
regulator resumes its normal
functioning mode.
Fig. 6b. Incoming surge/output surge
across load
Soft Start-Up Circuits
Here the regulator characteristic will
clamp initial current surges which can
occur when power is initially applied
to a load. The device, with its 450 V
capability could, for example, be used
with a DC power supply or with AC
mains to limit the initial high inrush of
current into lamp filaments, thereby
increasing the filament life several
times. It could, therefore, be used
effectively in lighting displays and in
the transportation lighting industries.
Highly Stable Voltage Sources
Another obvious application would be
to use the current regulator as a
IXYS MOSFETs and IGBTs are covered by 4,835,592
one or moreof the following U.S. patents: 4,850,072
4,881,106
Fig. 9. Normal fusing links in
series with each board
Testing & Handling
Recommendations
For initial assessment of the parts
where the customer may test the
device characteristics in free air
without heat sinking, the continuous
power dissipation should be kept
within 1.5 W at ambient of 25
°
C.
(R
thJA
= 80 K/W for TO-220, and
R
thJA
= 100 K/W for TO-252)
Normal electrostatic handling
precautions for MOS devices
should be adhered to.
4,931,844
5,017,508
5,034,796
5,049,961
5,063,307
5,187,117
5,237,481
5,381,025
5,486,715
6,162,665
6,259,123 B1
6,306,728 B1
6,404,065 B1
6,534,343
6,583,505
6,683,344
6,710,405B2
6,710,463
6,727,585
6,759,692
3
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