20- to 40-VIN, 50-W Space-grade isolated flyback DC/DC over-current protection reference design TIDA-070002 (ACTIVE)

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Description

Spacecraft bus voltages vary from the well-established 28-V to more than the 100-V typically used in highpower commercial communications satellites, this reference design shows an example for a space-grade 50-W isolated intermediary bus converter, while implementing over-current protection (OCP) limit function. This design features INA901-SP radiation hardened current monitor, LM139AQML-SP quadcomparator, and UC1901-SP to create an isolated feedback flyback with current sensing and overcurrent flags – the UC1843A-SP current mode PWM controller is used to switch the low side MOSFET of the flyback converter and provide voltage and current to the output, the UC1901-SP senses the output voltage and completes the loop for the isolated feedback. The INA901-SP senses the input current which is provided to the LM139AQML-SP to create an overcurrent flag.

Features
  • Isolated magnetic feedback using UC1901-SP
  • Current sensing using INA901-SP
  • Overcurrent comparison using LM139AQML-SP
  • Pulse-by-pulse current limiting
  • Double pulse suppression
  • Multiple feedback paths supported

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Parametrics
 TIDA-070002.1
(Output Voltage 1)
Vin (Min) (V)20
Vin (Max) (V)40
Vout (Nom) (V)5
Iout (Max) (A)10
Output Power (W)50
Isolated/Non-IsolatedIsolated
Input TypeDC
TopologyFlyback- CCM

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA901-SP  Radiation hardened, -15V to 80V common mode, unidirectional current-shunt monitor  Current sense amplifiers  View Design Kits & Evaluation Modules
LM139AQML-SP  Low Power Low Offset Voltage Quad Comparator  Amplifiers  View Design Kits & Evaluation Modules
UC1843A-SP  Current Mode PWM Controller  Offline & isolated DC/DC controllers & converters  View Design Kits & Evaluation Modules
UC1843B-SP  Class V, radiation hardened current-mode PWM controller  Offline & isolated DC/DC controllers & converters  View Design Kits & Evaluation Modules
UC1901-SP  Isolated Feedback Generator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM139AQML-SP Download
Download Download
Download
UC1843A-SP Download -
Download -
UC1843B-SP Download -
UC1901-SP Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 16285 30 Jul 2019
Design files (6)
Title Type Size (KB) Date
ZIP 930 21 Dec 2018
ZIP 603 21 Dec 2018
PDF 1389 21 Dec 2018
PDF 285 21 Dec 2018
PDF 107 21 Dec 2018
PDF 339 21 Dec 2018
Related Tools & Software

Reference Designs  ( 3 )


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