Product details

Topology Boost, Buck, Flyback, Forward Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 8.4/7.7 Features Error Amplifier, Multi-topology Operating temperature range (C) -55 to 125, 25 to 25 Rating Space Gate drive (Typ) (A) 1
Topology Boost, Buck, Flyback, Forward Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 8.4/7.7 Features Error Amplifier, Multi-topology Operating temperature range (C) -55 to 125, 25 to 25 Rating Space Gate drive (Typ) (A) 1
CFP (HKU) 10 45 mm² 10 x 10
  • QML class V (QMLV) qualified, SMD 5962-86704
  • 5962R8670412VYC:
    • Radiation hardness assurance (RHA) up to 100-krad(Si) total ionizing dose (TID)
  • 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
  • 5962R8670412VYC:
    • Radiation hardness assurance (RHA) up to 100-krad(Si) total ionizing dose (TID)
  • 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 UC1843B-SP control IC is a radiation hardened pin-for-pin compatible version of the UC1843A-SP. 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 UC1843B-SP control IC is a radiation hardened pin-for-pin compatible version of the UC1843A-SP. 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.

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Technical documentation

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Type Title Date
* Data sheet UC1843B-SP QML Class V, Radiation Hardened Current-Mode PWM Controller datasheet (Rev. B) PDF | HTML 07 Dec 2020
* SMD UC1843B-SP SMD 5962-86704 19 May 2020
* Radiation & reliability report Single-Event Effects Test Report of the UC1843B-SP Current Mode PWM Controller 09 Aug 2019
* Radiation & reliability report UC1843B-SP Neutron Displacement Damage (NDD) Characterization 28 Jun 2019
* Radiation & reliability report UC1843B-SP total ionizing dose (TID) radiation report 28 Feb 2019
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
User guide UC1843B-SP evaluation module (EVM) user's guide 29 Mar 2019

Design & development

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

Evaluation board

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

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 (...)
User guide: PDF
Not available on TI.com
Support software

UC1843B-SP Flyback Converter Calculator (Rev. B)

SLUC691B.ZIP (396 KB)
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
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