Radiation-hardness-assured (RHA), 30-V, 2-A, double-ended, 1-MHz PWM controller


Product details


Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Control method Peak Current Mode, Voltage VCC (Min) (V) 10 VCC (Max) (V) 30 Duty cycle (Max) (%) 80 UVLO thresholds on/off (V) 10/9.2 Frequency (Max) (kHz) 1000 Operating temperature range (C) -55 to 125, 25 to 25 Gate drive (Typ) (A) 2 Features Adjustable Switching Frequency, Enable/Shutdown, Error Amplifier, Integrated Gate Drivers, Programmable Soft Start, Soft Start Rating Space open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

CFP (HSL) (HKT) 16 72 mm² 10.16 x 7.1 open-in-new Find other PWM controllers & resonant controllers


  • QML-V qualified, SMD 5962-8768106
  • 5962R8768106VYC:
    • Radiation hardness assurance (RHA) up to 100-krad(Si) total ionizing dose (TID) (1)
  • Compatible with voltage- or current-mode topologies
  • Practical operation switching frequencies to 1 MHz
  • 50-ns propagation delay-to-output
  • High-current dual totem pole outputs (2-A peak)
  • Wide bandwidth error amplifier
  • Fully latched logic with double-pulse suppression
  • Pulse-by-pulse current limiting
  • Soft start/maximum duty-cycle control
  • Undervoltage lockout with hysteresis
  • Low start-up current (1.1 mA)

(1)Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/s. Radiation Lot Acceptance Testing is available - contact factory for details.

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The UC1825B-SP PWM control device is optimized for high-frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty-cycle clamp. The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis assures low start up current. During undervoltage lockout, the outputs are high impedance.

This device features totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on-state is designed as a high level.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 14
Type Title Date
* Datasheet UC1825B-SP Class-V, Radiation Hardened High-Speed PWM Controller datasheet Apr. 02, 2019
* Radiation & reliability report SEE Test Report of the UC1825B-SP High Speed PWM Controller Jun. 01, 2020
* SMD UC1825B-SP SMD 5962-87681 May 19, 2020
* Radiation & reliability report UC1825B-SP Neutron Displacement Damage Characterization Mar. 01, 2019
* Radiation & reliability report UC1825B-SP total ionizing dose (TID) radiation report Mar. 01, 2019
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer Aug. 21, 2020
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations May 18, 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form May 18, 2020
Application note Single-Event Effects Confidence Interval Calculations Jan. 14, 2020
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing Jun. 17, 2019
E-book Preview: Radiation Handbook for Electronics (Rev. A) Jun. 07, 2019
E-book Radiation Handbook for Electronics (Rev. A) May 21, 2019
Selection guide TI Space Products (Rev. G) May 15, 2019
User guide UC1825B-SP evaluation module (EVM) user's guide Mar. 29, 2019

Design & development

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

Hardware development

The UC1825B-SP EVM shows off the capabilites of the SP process using a push-pull topology. In combination with the UC1901-SP the controller is able to allow for both isolated and non-isolated regulation requirements. The design is able to use an ouput choke to allow for very low ripple for high (...)
  • Low output voltage ripple
  • Input range from 22 V to 48 V
  • Output of up to 10 A at 5 V

Design tools & simulation

SLUM653.TSC (5219 KB) - TINA-TI Reference Design
SLUM673.ZIP (6 KB) - TINA-TI Spice Model

CAD/CAE symbols

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CFP (HKT) 16 View options

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