1
High Voltage Current
Regulators
The IXYS IXC series of high voltage
current regulators consists of non-
switchable, 2-terminal, AC and DC
current regulators.
Features
zExtremely stable current character-
istics
(±
50 ppm/K)
zMinimum of 450 V breakdown
zEasily configured for bidirectional
current sourcing
z40 W continuous dissipation
zInternational standard packages
JEDEC TO-220 and TO-252
Applications
zPABX current sources
zTelephone line terminations in
PABXs and modems
zHighly stable voltage sources
zSurge limiters and voltage protection
(DC and AC)
zInstantaneously reacting resetable
fuses
zWaveform synthesizers
zSoft start-up circuits
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.
IXC Series
VAK = 450 V
IA(P) = 2 - 60 mA
RDYN = 9 - 900 kΩΩ
ΩΩ
Ω
TO-252 AA
(IXCY)
TO-220 AB
(IXCP)
Current Regulator Nomenclature
Parts can be ordered by using the following
nomenclature:
IXCP10M45A (Example)
IX IXYS
CCurrent Regulator
Package style
PTO-220 AB
YTO-252 (D-PAK)*
10 Current Rating,
10 = 10 mA
MCurrent Level
A = Amps, M = mA,
U = µA
45 Voltage rating
45 = 450 V
Preliminary Data Sheet
Fig. 1. Current Regulator Output
Characteristics
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.
Fig. 2. Block diagram for the non-switchable regulator
DS98703A (7/04)
4
1
3
4
123
© 2004 IXYS All rights reserved
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IXC Series
TO-220 AB Outline
Symbol Definition Maximum Ratings
VAK Drain Source Voltage 450 V
PDPower Dissipation IXC_02M to IXC_50M 25 W
(TC = 25°C) IXC_60M & IXC_100M 40 W
IRM Maximum Reverse Current 1 A
TJJunction Operating Temperature -55 to +150 °C
Tstg Storage Temperature -55 to +150 °C
TLTemperature for soldering (max. 10 s) 260 °C
MDMounting torque with screw M3 (TO-220) 0.45/4 Nm/lb.in.
with screw M3.5 (TO-220) 0.55/5 Nm/lb.in.
Symbol Definition/Condition Characteristic Values
(TJ = 25°C, unless otherwise specified)
min. typ. max.
BVAK* Breakdown __M45 ID = 1.5 IA(P) 450 V
voltage:
IA(P) Plateau 02M__ VAK = 10 V 1.9 2.0 2.5 mA
Current 10M__ 9.0 10 11.8 mA
20M__ 18 20 22 mA
40M__ 36 40 44 mA
50M__ 45 50 55 mA
60M__ 56 60 64 mA
100M__ 88 100 110 mA
∆∆
∆∆
∆IA(P)/∆∆
∆∆
∆TPlateau Current Shift VAK= 10 V
±
50 ppm/K
with Temperature
∆∆
∆∆
∆VAK/∆∆
∆∆
∆ IA(p) Dynamic 02M__ VAK = 10 V 800 900 kΩ
Resistance 10M__ 160 180 kΩ
20M__ 78 85 kΩ
50M__ 19 21 kΩ
60M__ 15 17 kΩ
100M__ 8 9 kΩ
VFDiode forward voltage drop; IF = 50mA 1.8 V
RthJC Thermal Resistance junction-to-case IXC_02M to IXC_50M 5.0 K/W
IXC_60M & IXC_100M 3.1 K/W
RthJA 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.
Non-Switchable DC Current Regulators
TO-252 AA Outline
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
Dim. Millimeter Inches
Min. Max. Min. Max.
A 2.19 2.38 0.086 0.094
A1 0.89 1.14 0.035 0.045
A2 0 0.13 0 0.005
b 0.64 0.89 0.025 0.035
b1 0.76 1.14 0.030 0.045
b2 5.21 5.46 0.205 0.215
c 0.46 0.58 0.018 0.023
c1 0.46 0.58 0.018 0.023
D 5.97 6.22 0.235 0.245
D1 4.32 5.21 0.170 0.205
E 6.35 6.73 0.250 0.265
E1 4.32 5.21 0.170 0.205
e 2.28 BSC 0.090 BSC
e1 4.57 BSC 0.180 BSC
H 9.40 10.42 0.370 0.410
L 0.51 1.02 0.020 0.040
L1 0.64 1.02 0.025 0.040
L2 0.89 1.27 0.035 0.050
L3 2.54 2.92 0.100 0.115
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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.
Testing & Handling
Recommendations
zFor 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.
(RthJA = 80 K/W for TO-220, and
RthJA = 100 K/W for TO-252)
zNormal electrostatic handling
precautions for MOS devices
should be adhered to.
Fig. 5. DC surge suppression
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
Fig. 9. Normal fusing links in
series with each board
Fig.8. Low cost current regulators
instead of fuses
Fig. 6b. Incoming surge/output surge
across load
Fig. 6a. 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.
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.
The obvious advantages to having this
regulator as fuse substitute are:
zPrevents a "dip" in the power
supply during a fault condition
zRegulator remains intact
zCan be easily tied in with logic to
indicate a "down state" board
R = 100 ΩVout = 3.5 V nominal
R = 50 ΩVout = 1.75 V nominal
R = 25 ΩVout = 0.875 V nominal
Fig. 7. Simple voltage source with
high stability
IXC Series
IXYS MOSFETs and IGBTs are covered by 4,835,592 4,931,844 5,049,961 5,237,481 6,162,665 6,404,065 B1 6,683,344 6,727,585
one or moreof the following U.S. patents: 4,850,072 5,017,508 5,063,307 5,381,025 6,259,123 B1 6,534,343 6,710,405B2 6,759,692
4,881,106 5,034,796 5,187,117 5,486,715 6,306,728 B1 6,583,505 6,710,463
