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UC1843A-SP

ACTIVE

Radiation-tolerant, QML-V, enhanced 30V input, 1A 500kHz PWM controller, 100% duty cycle

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Data sheet

UC1843A-SP

ACTIVE
Data sheet Order now

Product details

Topology Boost, Flyback, Forward Control mode Current Features Error amplifier, Multi-topology Duty cycle (max) (%) 100
Topology Boost, Flyback, Forward Control mode Current Features Error amplifier, Multi-topology Duty cycle (max) (%) 100
CDIP (JG) 8 64.032 mm² (— mm × — mm) LCCC (FK) 20 79.0321 mm² (— mm × — mm) CFP (HKU) 10 45.4896 mm² (— mm × — mm)
  • QML Class V (QMLV) Qualified, SMD 5962-86704
  • 5962P8670409Vxx:
    • Radiation Hardness Assurance (RHA) up to
      30-krad(Si) Total Ionizing Dose (TID)
    • Passes Functional and Specified Post-Radiation Parametric Limits at 45 krad at LDR (10 mrad(Si)/s) per 1.5× Over Test as Defined in MIL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b
    • Exhibits Low-Dose Rate Sensitivity but Remains Within the Pre-Radiation Electrical Limits at 30-krad Total Dose Level, as Allowed by MIL-STD-883, TM1019
  • Optimized for Offline and DC-to-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout (UVLO) With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally-Trimmed Bandgap Reference
  • 500-kHz Operation
  • Low RO Error Amplifier
  • QML Class V (QMLV) Qualified, SMD 5962-86704
  • 5962P8670409Vxx:
    • Radiation Hardness Assurance (RHA) up to
      30-krad(Si) Total Ionizing Dose (TID)
    • Passes Functional and Specified Post-Radiation Parametric Limits at 45 krad at LDR (10 mrad(Si)/s) per 1.5× Over Test as Defined in MIL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b
    • Exhibits Low-Dose Rate Sensitivity but Remains Within the Pre-Radiation Electrical Limits at 30-krad Total Dose Level, as Allowed by MIL-STD-883, TM1019
  • Optimized for Offline and DC-to-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout (UVLO) With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally-Trimmed Bandgap Reference
  • 500-kHz Operation
  • Low RO Error Amplifier

The UC1843A-SP control IC is a radiation hardened pin-for-pin compatible version of the UC184x family. Providing the necessary characteristics to control current-mode switched-mode power supplies, this device has improved features. Start-up current is specified to be less than 0.5 mA and oscillator discharge is trimmed to 8.3 mA. During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The Device Comparison Table shows the difference between members of this family. Reference the individual product data sheets for ordering the radiation-improved version if available.

The UC1843A-SP control IC is a radiation hardened pin-for-pin compatible version of the UC184x family. Providing the necessary characteristics to control current-mode switched-mode power supplies, this device has improved features. Start-up current is specified to be less than 0.5 mA and oscillator discharge is trimmed to 8.3 mA. During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The Device Comparison Table shows the difference between members of this family. Reference the individual product data sheets for ordering the radiation-improved version if available.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet UC1843A-SP QML class V, radiation hardened current-mode PWM controller datasheet (Rev. A) PDF | HTML Feb 21, 2019
* Radiation & reliability report UC1843A-SP NDD (Neutron Displacement Damage) Characterization Aug 5, 2021
* Radiation & reliability report UC1843A-SP Radiation Test Report May 11, 2015
* SMD UC1843A-SP SMD 5962-86704 Jul 8, 2016
Selection guide TI Space Products (Rev. L) Mar 27, 2026
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form (Rev. A) PDF | HTML Nov 5, 2025
Application brief DLA Approved Optimizations for QML Products (Rev. C) PDF | HTML Jun 17, 2025
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. B) PDF | HTML Jun 10, 2025
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. B) Feb 20, 2025
Application note QML flow, its importance, and obtaining lot information (Rev. C) Aug 30, 2023
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML Oct 19, 2022
Application brief Controlling Input Power for Present and Next-Generation Power Controllers PDF | HTML Dec 14, 2020
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer Aug 21, 2020
E-book Radiation Handbook for Electronics (Rev. A) May 21, 2019
Technical article Power Tips: Calculate an R-C snubber in seven steps PDF | HTML May 5, 2016
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers Feb 7, 2002
Application note DN-65 Considerations in Powering BiCMOS ICs Sep 5, 1999
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences Sep 5, 1999
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit Sep 5, 1999
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty Sep 5, 1999
Application note DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection Sep 5, 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies Sep 5, 1999
Application note U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control Sep 5, 1999
Application note Modeling, Analysis and Compensation of the Current-Mode Converter Sep 5, 1999
Application note DN-30 Programmable Electronic Circuit Breaker Sep 5, 1999
Application note DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers Sep 5, 1999
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode Sep 5, 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

UC1843A-SP TINA-TI Transient Reference Design

SLUM674.TSC (6331 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

UC1843A-SP TINA-TI Transient Spice Model

SLUM675.ZIP (17 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

UC1843A-SP Unencrypted PSpice Transient Model

SLUM660.ZIP (3 KB) - PSpice model
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
CDIP (JG) 8 Ultra Librarian
LCCC (FK) 20 Ultra Librarian
CFP (HKU) 10 Ultra Librarian
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