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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. ZES744 (60V/4A), ZES723 (28V/4A) are ‘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 LCL (60V/4A)
Electrical Performance Radiation Performance
Part Number Model Input Voltage Output Current (built-in MOSFET) Operating Temperature TID SEL Package Type Datasheet
ZES744LCLFQ-EP Flight Model 4V~60V 4A -40oC to +120oC TBC TBC QFN48L(9x9mm)
ZES744LCLGQ-EP Ground Model 4V~60V 4A 25oC TBC TBC QFN48L(9x9mm)
ZES744LCLGEV-EP Evaluation Kit – – – – – Evaluation Kit

  

Product Offering LCL (28V/4A)
Electrical Performance Radiation Performance
Part Number Model Input Voltage Output Current (built-in MOSFET) Operating Temperature TID SEL Package Type Datasheet
ZES723LCLFQ-EP Flight Model 4V~28V 4A -40oC to +120oC TBC TBC QFN48L(9x9mm)
ZES723LCLGQ-EP Ground Model 4V~28V 4A 25oC TBC TBC QFN48L(9x9mm)
ZES723LCLGEV-EP Evaluation Kit – – – – – Evaluation Kit

  

Summary
  • Wide-range supply voltage: LCL(60V): 4V-60V, LCL(28V): 4V-28V
  • Output current up to 4A (Built-in MOSFET)
  • Higher output currents >4A, with an external MOSFET power switch
  • Very low quiescent current: <2mA (Typ.)
  • Fast trip-off time within 4ms
  • 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: TBC
    SEL: TBC

  • Full Tempr. range operation (Ta = −40°C to +120°C)
  • Qualified for Space Enhanced Plastic (SEP)
  • Package: Space Enhanced Plastic QFN48L (9x9mm)
  • 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

 



LCL Typical Application Circuit VIN=60V, 4A

 
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.