2022 Littelfuse, Inc.
6
Solid State Relays Fault-Protected Relays
Active Current Limiting SSRs with Voltage Triggered Shutdown & Thermal Management
Part Number Blocking Voltage (V
P
) Input Control Current (mA) On-Resistance (Maximum) Load Current (Maximum) Current Limit (Maximum) * VTS Threshold Switching Speed Isolation Voltage (V
RMS
) Features & Comments DC-Only ( ) AC ( ) DC-Only (mA) AC (mA) DC-Only (mA
P
) AC (mA
P
) (V
TH
) (V) (t
on
/ t
off
) (ms) CPC1510 250 2 3.75 15 350 200 920 450 - 2 / 2 3750 Industrial applications CPC1511 230 2.5 - 4 - 450 - 1400 - 4 / 2 3750 Industrial applications CPC1540 350 2 6.75 25 250 120 570 285 100 2 / 2 3750 PSTN hook switch applications CPC1560 60 1.1 1.4 5.6 600 300 1500 900 - 0.1 / 0.4 3750 Fast switching speeds CPC1561B 60 2.5 - 0.245 - 1000 - 3000 - 2.5 / 0.5 3750 1A load current rating to 60C CPC1563 600 2 11.75 35 250 120 570 285 100 2 / 2 3750 High blocking voltage CPC1593 600 2 11.75 35 250 120 570 285 21 2 / 2 3750 Power supply start-up
Features & Benefits
Provides excellent power-cross immunity Resumes normal operation after the fault is removed Ideal for use in electromagnetically noisy environments All of the Fault Protected Solid State Relays (SSR) listed below feature active-current Limiting and Thermal Management while the CPC1540, CPC1563, and CPC1593 additionally feature Voltage Triggered Shutdown, or VTS. Fault Protected SSRs can directly replace footprint-compatible standard SSRs in existing designs to improve end-product survivability. These Fault Protected relays resume normal operation upon removal of the fault condition or upon cycling the input control current. Should the fault condition repeat or persist, the fault protection will immediately resume. Active Current Limiting: All Fault Protected SSRs limit the load current to protect both the load and the SSR. Voltage Triggered Shutdown: CPC1540, CPC1563, and CPC1593 incorporate a third protection feature called Voltage Triggered Shutdown (VTS). During a current limiting event, this advanced thermal management protection feature reduces the relay current to <100A whenever the voltage drop across the relay exceeds a non-adjustable predetermined threshold thereby preventing excessive heating of the SSR. Thermal Management: All the Fault Protected relays include the traditional thermal management feature that deactivates the SSR outputs anytime the die temperature exceeds a safe limit regardless of the Active Current Limiting state and when equipped, the Voltage Triggered Shutdown state. This feature provides excellent power cross immunity. al
Voltage Threshold Shutdown Delay Voltage Threshold Shutdown Reactivation Delay Current Through Relay Load Voltage +V
TH
+I
LMT
Time -V
TH
-I
LMT
Performance into resistive load Voltage Threshold
With I
LIMIT
With VTS
Performance into resistive load
+I
LMT
Current Through Relay Time -I
LMT
Load Voltage
With I
LIMIT
Without VTS
6-Pin Surface Mount 8-Pin Surface Mount 6-Pin DIP 8-Pin DIP 16-Pin SOIC Power SIP
Note - Images are to scale..
Thermal Management Gate Drive Control Voltage Triggered Shutdown S1 S2 OUT1 OUT2 OUT1 OUT2 S1 S2
Load
4 6 5
+ Control
1 2
- Control
Current Limit Gate Drive Control Thermal Management
Load
4 6 5
+ Control
1 2
- Control
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