Class V, radiation hardened current-mode PWM controller


Product details


Topology Boost, Buck, Flyback, Forward Control method Peak Current Mode, Voltage VCC (Min) (V) 12 VCC (Max) (V) 25 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 8.4/7.7 Frequency (Max) (kHz) 500 Operating temperature range (C) -55 to 125 Gate drive (Typ) (A) 1 Features Error Amplifier, Multi-topology Rating Space open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

CFP (HKU) 10 - open-in-new Find other PWM controllers & resonant controllers


  • 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

All trademarks are the property of their respective owners.

open-in-new Find other PWM controllers & resonant controllers


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.

open-in-new Find other PWM controllers & resonant controllers

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 10
Type Title Date
* Datasheet UC1843B-SP QML Class V, Radiation Hardened Current-Mode PWM Controller datasheet (Rev. A) Jul. 30, 2019
SMD UC1843B-SP SMD 5962-86704 May 19, 2020
Radiation & Reliability reports Heavy Ion Orbital Environment Single-Event Effects Estimations May 18, 2020
Radiation & Reliability reports Single-Event Effects Test Report of the UC1843B-SP Current Mode PWM Controller Aug. 09, 2019
Radiation & Reliability reports UC1843B-SP Neutron Displacement Damage (NDD) Characterization Jun. 28, 2019
More literature Preview: Radiation Handbook for Electronics (Rev. A) Jun. 07, 2019
Solution guides Radiation Handbook for Electronics (Rev. A) May 21, 2019
Selection guides TI Space Products (Rev. G) May 15, 2019
User guides UC1843B-SP evaluation module (EVM) user's guide Mar. 29, 2019
Radiation & Reliability reports UC1843B-SP total ionizing dose (TID) radiation report Feb. 28, 2019

Design & development

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

Hardware development

document-generic User guide
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 (...)
  • PWM control using UC1843B-SP
  • Over current comparison using LM139AQML-SP
  • Current sensing using INA901-SP

Software development

SLUC691B.ZIP (396 KB)

Design tools & simulation

SLUM660.ZIP (3 KB) - PSpice Model
SLUM661.ZIP (105 KB) - PSpice Model
SLUM674.TSC (6331 KB) - TINA-TI Reference Design
SLUM675.ZIP (17 KB) - TINA-TI Spice Model

Reference designs

20- to 40-VIN, 50-W Space-grade isolated flyback DC/DC over-current protection reference design
TIDA-070002 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
CFP (HKU) 10 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

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. ​​​​​​​​​​​​​​