Home Power management AC/DC & isolated DC/DC switching regulators PWM controllers

UC1825-SP

ACTIVE

Radiation-tolerant QMLV, 30-V input, 1.5-A dual-output 1-MHz PWM controller

A newer version of this product is available

open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device
UC1825B-SP ACTIVE Radiation-hardened QMLV, 30-V input, 2-A dual-output 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 mode Current Duty cycle (max) (%) 80 Switching frequency (max) (kHz) 1000 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 9.2/8.4 Operating temperature range (°C) -55 to 125 Rating Space Gate drive (typ) (A) 1.5 Vin (max) (V) 20 Radiation, SEL (MeV·cm2/mg) Bipolar
Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 80 Switching frequency (max) (kHz) 1000 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 9.2/8.4 Operating temperature range (°C) -55 to 125 Rating Space Gate drive (typ) (A) 1.5 Vin (max) (V) 20 Radiation, SEL (MeV·cm2/mg) Bipolar
CDIP (J) 16 135.3552 mm² 19.56 x 6.92 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • QML-V Qualified, SMD 5962-87681
  • Rad-Tolerant: 30 kRad (Si) 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 (1.5 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/sec. Radiation Lot Acceptance Testing is available - contact factory for details.

  • QML-V Qualified, SMD 5962-87681
  • Rad-Tolerant: 30 kRad (Si) 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 (1.5 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/sec. Radiation Lot Acceptance Testing is available - contact factory for details.

The UC1825 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 UC1825 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.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
TPS7H5001-SP ACTIVE Radiation-hardened, QMLV and QMLP 2-MHz dual-output PWM controller with synchronous rectification More feature rich QML-qualified radiation-hardened PWM controller family.
TPS7H5005-SEP ACTIVE Radiation-tolerant, 2-MHz, dual-output PWM controller with synchronous rectification 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 12
Type Title Date
* Data sheet High-Speed PWM Controller. datasheet (Rev. A) 22 Mar 2012
* SMD UC1825-SP SMD 5962-87681 08 Jul 2016
* Radiation & reliability report UC1825-SP Radiation Test Report (5962-8768104VEA) 08 May 2015
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. A) 31 Aug 2023
Application note QML flow, its importance, and obtaining lot information (Rev. C) 30 Aug 2023
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. A) PDF | HTML 17 Nov 2022
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19 Oct 2022
Selection guide TI Space Products (Rev. I) 03 Mar 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
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form PDF | HTML 18 May 2020
E-book Radiation Handbook for Electronics (Rev. A) 21 May 2019

Design & development

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

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
Reference designs

PMP22680 — 40-W, ±15-V flyback with magnetic feedback reference design

This reference design generates an isolated ±15 V at 40 W from a 70-V to 120-V DC input voltage. The design uses a magnetic feedback circuit to replace the function of an optocoupler.
Test report: PDF
Reference designs

PMP23033 — 40-W 5-V single-switch forward converter with magnetic feedback reference design

This reference design generates an isolated 5-V at 40-W from a 60-V to 120-V DC-input voltage. The design uses a magnetic feedback circuit to replace the function of an optocoupler.
Test report: PDF
Package Pins Download
CDIP (J) 16 View options
LCCC (FK) 20 View options

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

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