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Latching Current Limiter (LCL)

Latching Current Limiter (LCL) provides individual over-current protection to payloads protecting the satellite power bus from any faulty current due to radiation induced Single Event Latch-up (SEL) that significantly compromise the reliability of the semiconductor devices and the mission lifetime.
LCL primary function is current limiting and power switching. ZES712 is a ‘Smart-LCL’ with unique smart-monitor with two modes of operations: Latched or Re-triggerable, with built-in smart current limitation for repetitive overloads and embedded current sensing and digital status for system monitoring.
 

 

Product Offering

 
Part Number
 
Model
Electrical Performance
Input Voltage Load Current Operating Temperature
Radiation Performance
TID SEL
Package Type Datasheet
ZES712LCLFQ-EP Flight Model
5V~15V 2A -55°C to 125°C
300 Krad (Si) 99 MeV.cm2/mg
QFN40L (5x5mm)
ZES712LCLGQ-EP Ground Model
5V~15V 2A 25°C
300 Krad (Si) 99 MeV.cm2/mg
QFN40L (5x5mm)
ZES712LCLGEV-EP Evaluation Kit
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Evaluation Kit
Summary
  • Wide-range supply voltage: 5 to 15V DC
  • Output current up to 2A (Built-in MOSFET)
  • Higher output currents >2A, with an external MOSFET power switch
  • Very low quiescent current: 1.2mA (Typ.)
  • Fast trip-off time within 18ms
  • External ON/OFF command
  • Two modes of operation: Latched or Re-triggerable
  • Configurable trip-off and recovery times
  • Smart current limitation for repetitive overload
  • Embedded current sense
  • Digital status for system monitoring
  • Configurable under-voltage protection
  • Floating ground
  • Radiation Hardened by Design (RHBD)

    • TID: 100 Krad (Si) HDR
    SEL: 99 MeV.cm2/mg

  • Full Tempr. range operation (Ta = −40°C to +125°C)
  • Qualified for Space Enhanced Plastic (SEP)
  • Package: Space Enhanced Plastic QFN40L (5mm x 5mm)
  • ITAR free
  • ECSS-E-ST-20-20C standards compliance

 

Target Applications
  • Satellite Power bus over-current protection switches
  • Power Distribution Units (PDU) and Electric Power Systems (EPS)
  • Over-current protection switches for various subsystems

 

 Smart LCL has unique smart-monitor with two types of operations: Latched or Re-triggerable comes with built-in smart current limitation for repetitive overloads.
Latched refers to a circuit that holds its state (e.g., ON or OFF) even after the input signal is removed, while Re-triggerable refers to a circuit that can be triggered multiple times while it’s in a triggered state, extending the output pulse.
ZES LCL has embedded current sensing and digital status for system monitoring. Further, to enable design flexibility Smart-LCL offers configurable trip-off and recovery times, external setting of the under-voltage protection block hysteresis, and floating-ground connected to the true-ground through a decoupling resistor to operate in the floating-ground configuration.
 

LCL Typical Application Circuit (VIN=12V, 1A)