Space-grade, 30-V, 2-A double ended 1-MHz PWM controller with 9.2-V/8.4-V UVLO and 50% duty cycle

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UC1825B-SP ACTIVE Radiation-hardness-assured (RHA), 30-V, 2-A, double-ended, 1-MHz PWM controller Improved TID performance (100 krad) with increased max frequency (1 MHz) and dual outputs for half/full-bridge, or push-pull topologies.

Product details


Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Control method Current VCC (Min) (V) 10 VCC (Max) (V) 30 Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) 9.2/8.4 Frequency (Max) (kHz) 1000 Operating temperature range (C) -55 to 125 Gate drive (Typ) (A) 2 Features Error Amplifier, Leading Edge Blanking, Multi-topology, Soft Start, Synchronization Pin Rating Space open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

CDIP (J) 16 135 mm² 19.65 x 6.92 CDIP (J) 16 CFP (HSL) (HKT) 16 LCCC (FK) 20 79 mm² 8.89 x 8.89 open-in-new Find other PWM controllers & resonant controllers


  • QML-V Qualified, SMD 5962-87681
  • 5962P8768105Vxx:
    • 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
  • Compatible With Voltage-Mode or Current-Mode Control Methods
  • Practical Operation at Switching Frequencies to 1 MHz
  • 50-ns Propagation Delay to Output
  • High-Current Dual Totem Pole Outputs (2-A Peak)
  • Trimmed Oscillator Discharge Current
  • Low 100-µA Start-Up Current
  • Pulse-by-Pulse Current Limiting Comparator
  • Latched Overcurrent Comparator With Full Cycle Restart
  • Qualified Over the Military Temperature Range (–55°C to 125°C)
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The UC1825A-SP PWM controller is a radiation hardened version of the standard UC1825 family. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold is assured to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead time control. Frequency accuracy is improved to 6%. Start-up supply current, typically 100 µA, is ideal for offline applications. The output drivers are redesigned to actively sink current during UVLO at no expense to the start-up current specification. In addition each output is capable of 2-A peak currents during transitions.

Functional improvements have also been implemented in this device family. The UC1825 shutdown comparator is now a high-speed overcurrent comparator with a threshold of 1.2 V. The overcurrent comparator sets a latch that ensures full discharge of the soft-start capacitor before allowing a restart. While the fault latch is set, the outputs are in the low state. In the event of continuous faults, the soft-start capacitor is fully charged before discharge to insure that the fault frequency does not exceed the designed soft start period. The UC1825 CLOCK pin has become CLK/LEB. This pin combines the functions of clock output and leading edge blanking adjustment and has been buffered for easier interfacing.

The UC1825A-SP has dual alternating outputs and the same pin configuration of the UC1825. The UC1825A-SP version parts have UVLO thresholds identical to the original UC1825.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet UC1825A-SP Class-V, Radiation Hardened High-Speed PWM Controller datasheet (Rev. C) Dec. 09, 2016
* SMD UC1825A-SP SMD 5962-87681 Jul. 08, 2016
* Radiation & reliability report UC1825A-SP Radiation Test Report (5962-8768105VEA) May 08, 2015
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
Application note UC1825A-SP TID Report Dec. 12, 2016

Design & development

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CAD/CAE symbols

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CDIP (J) 16 View options
CFP (HKT) 16 View options
LCCC (FK) 20 View options

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