UC1843B-SP current mode PWM controller evaluation module


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The UC1843BEVM-CVAL uses the UC1843A-SP, INA901-SP, LM139AQML-SP, and UC1901-SP to create an isolated feedback flyback with current sensing and over current flags. The UC1843A-SP 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 over current flag.

  • PWM control using UC1843B-SP
  • Over current comparison using LM139AQML-SP
  • Current sensing using INA901-SP
Analog current-sense amplifiers
INA901-SP Radiation hardened, -15-V to 65-V, split-stage current sense amplifier with in-line filter option


LM139AQML-SP Low Power Low Offset Voltage Quad Comparator


PWM controllers
UC1843B-SP Radiation-hardened QMLV, 30-V input, 1-A single-output 500-kHz PWM controller, 100% duty cycle


SR & load share controllers
UC1901-SP Space-grade QMLV with isolated feedback generator
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Evaluation board

UC1843BEVM-CVAL — UC1843B-SP current mode PWM controller evaluation module

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Type Title Date
* User guide UC1843B-SP evaluation module (EVM) user's guide 29 Mar 2019
Data sheet UC1843B-SP QML Class V, Radiation Hardened Current-Mode PWM Controller datasheet (Rev. B) PDF | HTML 07 Dec 2020

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