Product details

Topology Boost, Flyback, Forward Duty cycle (Max) (%) 100 Vin (Max) (V) 25 UVLO thresholds on/off (V) 8.4/7.6 Features Error Amplifier, Multi-topology Operating temperature range (C) -55 to 125 Switching frequency (Max) (kHz) 500 Rating Space Gate drive (Typ) (A) 1
Topology Boost, Flyback, Forward Duty cycle (Max) (%) 100 Vin (Max) (V) 25 UVLO thresholds on/off (V) 8.4/7.6 Features Error Amplifier, Multi-topology Operating temperature range (C) -55 to 125 Switching frequency (Max) (kHz) 500 Rating Space Gate drive (Typ) (A) 1
CDIP (JG) 8 64 mm² 9.6 x 6.67 CFP (HKU) 10 45 mm² 10 x 10 LCCC (FK) 20 79 mm² 8.89 x 8.89
  • 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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Type Title Date
* Data sheet UC1843A-SP QML class V, radiation hardened current-mode PWM controller datasheet (Rev. A) PDF | HTML 21 Feb 2019
* Radiation & reliability report UC1843A-SP NDD (Neutron Displacement Damage) Characterization 05 Aug 2021
* SMD UC1843A-SP SMD 5962-86704 08 Jul 2016
* Radiation & reliability report UC1843A-SP Radiation Test Report 11 May 2015
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. A) PDF | HTML 17 Nov 2022
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19 Oct 2022
Selection guide TI Space Products (Rev. I) 03 Mar 2022
Application note Controlling Input Power for Present and Next-Generation Power Controllers PDF | HTML 14 Dec 2020
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 21 Aug 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form PDF | HTML 18 May 2020
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing 17 Jun 2019
E-book Radiation Handbook for Electronics (Rev. A) 21 May 2019
Technical article Power Tips: Calculate an R-C snubber in seven steps 05 May 2016
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 07 Feb 2002
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 05 Sep 1999
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences 05 Sep 1999
Application note DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection 05 Sep 1999
Application note DN-30 Programmable Electronic Circuit Breaker 05 Sep 1999
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 05 Sep 1999
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05 Sep 1999
Application note DN-65 Considerations in Powering BiCMOS ICs 05 Sep 1999
Application note DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 05 Sep 1999
Application note Modeling, Analysis and Compensation of the Current-Mode Converter 05 Sep 1999
Application note U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 05 Sep 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies 05 Sep 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
Simulation model

UC1843A-SP TINA-TI Transient Spice Model

SLUM675.ZIP (17 KB) - TINA-TI Spice Model
Simulation model

UC1843A-SP Unencrypted PSpice Transient Model

SLUM660.ZIP (3 KB) - PSpice Model
Reference designs

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

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) (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
CDIP (JG) 8 View options
CFP (HKU) 10 View options
LCCC (FK) 20 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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