CPC1593
Single-Pole, Normally Open OptoMOS
®
Relay
I
NTEGRATED
C
IRCUITS
D
IVISION
Parameter
Load Voltage
Load Current
On-Resistance (max)
Input Control Current
Rating
600
±120
35
2
Units
V
P
mA
mA
Integrated Current Limit with Voltage and Thermal Protection
Description
The CPC1593 is a normally open (1-Form-A)
Solid State Relay that incorporates load current
limiting with over-voltage protection and thermal
management. This self-resetting triple protection
scheme protects not only the CPC1593’s load,
but also the CPC1593 itself, thus creating a highly
effective switching mechanism that is designed to
survive in the harshest operating environments.
Over-voltage protection is activated when the voltage
across the switch is greater than 21V and the
device is in current limit. The over-voltage protection
deactivates the switch while allowing a restricted
load current of less than 100A to flow. When the
voltage across the switch falls below the over-voltage
threshold, the switches reactivate. If the fault persists,
then these responses will repeat.
The CPC1593 is designed for use in AC
environments where fault conditions can persist for
long periods of time, and where, upon removal of
the fault, return to normal operation is expected. The
CPC1593 is designed to survive extended power
cross conditions.
Features
•
Integrated Active Current-Limit with
Over-Voltage Protection
•
Thermal Regulation
•
600V
P
Blocking Voltage
•
Guaranteed Turn-On: 2mA Input Control Current
•
3750V
rms
Input/Output Isolation
•
Low Drive Power Requirements
(TTL/CMOS Compatible)
•
Arc-Free With No Snubbing Circuits
•
No EMI/RFI Generation
Applications
•
•
•
•
•
•
•
•
•
•
In-Rush Current Control
Heating, Ventilation, Air Conditioning Control (HVAC)
Security Systems
Power Supplies
Home Appliances
IC Equipment Protection
Instrumentation
Medical Equipment—Patient/Equipment Isolation
Aerospace
Industrial Controls
Approvals
•
UL Recognized Component: File E76270
•
CSA Certified Component: Certificate 1172007
•
EN/IEC 60950-1 Certified Component:
TUV Certificate: B 10 05 49410 006
Ordering Information
Block Diagram
LOAD
Part #
CPC1593G
CPC1593GS
CPC1593GSTR
Description
6-Pin DIP (50/Tube)
6-Pin Surface Mount (50/Tube)
6-Pin Surface Mount, Tape & Reel (1000/Reel)
Gate Drive
Control
+
V
F
Current Limit
and
Over-Voltage
Protection
Thermal
Management
Switching Characteristics of
Normally Open Devices
Form-A
I
F
90%
-
LOAD
I
LOAD
t
on
10%
t
off
Pb
DS-CPC1593-R01
RoHS
2002/95/EC
e
3
1
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NTEGRATED
C
IRCUITS
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IVISION
Functional Description
The CPC1593 is an optically coupled Solid State
Relay composed of an input LED, two output
MOSFET switches, and a photovoltaic array with
operational management circuitry that integrates
switch control, an active current limit with excess
power regulation and thermal supervision circuitry.
Designed specifically for switching AC loads, the
CPC1593 is ideal for controlling in-rush current
by means of it’s integrated active current limit with
excess power regulation feature. The CPC1593 may
also be used for switching low voltage DC loads.
Biasing the input LED to activate the output
switches while providing for proper performance
over the operating temperature range and during
load faults is dependent on adherence to the limits
given for the Input Control Current parameter in
the Recommended Operating Conditions table.
Configuring the input drive circuit to provide a
nominal LED current approximately equal to the
typical value listed in the table will provide best
overall performance.
The CPC1593 has two different operating
configurations: (1) unidirectional “DC Only”, and
(2) bidirectional “AC/DC”. When configured for
unidirectional DC-only operation, the device is limited
to switching load voltages having a known fixed
polarity but when configured for AC/DC operation,
the CPC1593 is capable of polarity independent
voltage switching. The advantage of operating the
device in the AC/DC configuration is the flexibility of
switching AC load voltages while restricting in-rush
current to the maximum current limit value shown in
the Electrical Characteristics table without sacrificing
fault protection.
Fault tolerance management at the CPC1593 load
terminals is accomplished using a combination
of current limiting, switch power regulation and
thermal supervision. These features autonomously
provide protection during fault conditions, then
disengage once the fault clears allowing the device
to automatically resume normal operation without
external intervention.
Faults originate from a number of causes ranging
from equipment malfunctions such as load
integrity failure or load voltage supply failure to
environmentally initiated events such as power line
contact with outside cabling or ground bounce due to
a nearby lightning strike. Generally when a potentially
damaging fault condition occurs, it presents itself as
an elevated voltage resulting in excess load current
through the switch. Therefore, in this situation, the
first line of defense is to limit the increasing load
current.
R01
CPC1593
Active current limiting circuitry within the CPC1593
provides protection for itself, the printed circuit board
(PCB) traces and the load by restricting the surge
current to a tolerable level. Limiting the fault load
current regulates the maximum power across all of
the load components external to the CPC1593. The
consequence of limiting the power dissipation in the
external load components is that the power load is
shifted to the CPC1593. This is easily observed by
monitoring the increasing voltage across the load
terminals while in current limit.
Under these conditions the maximum power
dissipation rating of the CPC1593 can be exceeded.
To prevent this, the device must regulate the
power dissipation of the output switches. This is
accomplished by a significant reduction of the load
current anytime the current limit function is active
and the voltage across the load terminals exceeds
the internally set Over-Voltage Threshold (V
TH
). The
load current is then reduced to less than 100A and
held at this level until the voltage across the load
terminals decreases to less than V
TH
at which point
the outputs will resume normal operation. Should the
fault condition persist, current limiting will begin again
and the process will repeat. Continually cycling into
current limit and over-voltage load current throttling
(I
L
<100A) with a long duration fault can result in
excessive temperature rise within the device, driving
it into thermal supervision.
Releasing the input control to deactivate the relay
during current limiting or over-voltage load current
throttling will reset these functions causing the relay
to resume normal operation when the input control is
re-asserted.
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