Home Power management AC/DC & DC/DC controllers (external FET)
Home
Power management
AC/DC & DC/DC controllers (external FET)

UC1843B-SP

ACTIVE

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

Order now
Data sheet

UC1843B-SP

ACTIVE
Data sheet Order now

Product details

Rating Space Topology Boost, Flyback, Forward Vin (max) (V) 25 Vin (min) (V) 12 Control mode Peak current mode Features Error amplifier, Multi-topology Operating temperature range (°C) -55 to 125 Duty cycle (max) (%) 100
Rating Space Topology Boost, Flyback, Forward Vin (max) (V) 25 Vin (min) (V) 12 Control mode Peak current mode Features Error amplifier, Multi-topology Operating temperature range (°C) -55 to 125 Duty cycle (max) (%) 100
CFP (HKU) 10 45.4896 mm² 7.02 x 6.48 DIESALE (KGD) — See data sheet
  • 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.
filter Find other AC/DC & DC/DC controllers (external FET)
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
NEW TPS7H5020-SEP ACTIVE Radiation-tolerant 100% duty cycle PWM controller for driving MOSFET or GaN FETs More feature rich radiation-tolerant PWM controller family for LEO or shorter duration missions

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 16
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 Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form (Rev. A) PDF | HTML 05 Nov 2025
Application brief DLA Approved Optimizations for QML Products (Rev. C) PDF | HTML 17 Jun 2025
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. B) PDF | HTML 10 Jun 2025
Selection guide TI Space Products (Rev. K) 04 Apr 2025
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. B) 20 Feb 2025
Application note QML flow, its importance, and obtaining lot information (Rev. C) 30 Aug 2023
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19 Oct 2022
Application brief 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
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
Simulation model

UC1843A-SP TINA-TI Transient Reference Design

SLUM674.TSC (6331 KB) - TINA-TI Reference Design
Download
Simulation model

UC1843A-SP TINA-TI Transient Spice Model

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

UC1843A-SP Unencrypted PSpice Transient Model

SLUM660.ZIP (3 KB) - PSpice Model
Download
Calculation tool

SLUC691 — UC1843B-SP Flyback Converter Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • UC1843B-SP — Radiation-hardened QMLV, 30-V input, 1-A single-output 500-kHz PWM controller, 100% duty cycle
Download
Package Pins CAD symbols, footprints & 3D models
CFP (HKU) 10 Ultra Librarian
DIESALE (KGD) —
TI's Standard Terms and Conditions for Evaluation Items apply.

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
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos