Product details

Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Duty cycle (Max) (%) 80 Supply voltage (Max) (V) 30 UVLO thresholds on/off (V) 10/9.2 Features Adjustable Switching Frequency, Enable/Shutdown, Error Amplifier, Integrated Gate Drivers, Programmable Soft Start, Soft Start Operating temperature range (C) -55 to 125, 25 to 25 Rating Space Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 2
Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Duty cycle (Max) (%) 80 Supply voltage (Max) (V) 30 UVLO thresholds on/off (V) 10/9.2 Features Adjustable Switching Frequency, Enable/Shutdown, Error Amplifier, Integrated Gate Drivers, Programmable Soft Start, Soft Start Operating temperature range (C) -55 to 125, 25 to 25 Rating Space Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 2
CFP (HSL) (HKT) 16 72 mm² 10.16 x 7.1
  • 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(Si)/s. Radiation Lot Acceptance Testing is available - contact factory for details.

  • 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(Si)/s. Radiation Lot Acceptance Testing is available - contact factory for details.

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.

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

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Type Title Date
* Data sheet UC1825B-SP Class-V, Radiation Hardened High-Speed PWM Controller datasheet (Rev. A) 16 Dec 2020
* Radiation & reliability report SEE Test Report of the UC1825B-SP High Speed PWM Controller 01 Jun 2020
* SMD UC1825B-SP SMD 5962-87681 19 May 2020
* Radiation & reliability report UC1825B-SP Neutron Displacement Damage Characterization 01 Mar 2019
* Radiation & reliability report UC1825B-SP total ionizing dose (TID) radiation report 01 Mar 2019
Selection guide TI Space Products (Rev. H) 27 Jan 2021
Application note Controlling Input Power for Present and Next-Generation Power Controllers 14 Dec 2020
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 21 Aug 2020
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations 18 May 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form 18 May 2020
Application note Single-Event Effects Confidence Interval Calculations 14 Jan 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 UC1825B-SP evaluation module (EVM) user's guide 29 Mar 2019

Design & development

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Evaluation board

UC1825BEVM-CVAL — 5V/50 W push-pull evaluation module

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 (...)
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Simulation model

UC1825 TINA-TI Transient Reference Design

SLUM653.TSC (5219 KB) - TINA-TI Reference Design
Simulation model

UC1825 Unencrypted TINA-TI Transient Spice Model

SLUM673.ZIP (6 KB) - TINA-TI Spice Model
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CFP (HKT) 16 View options

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