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UC1846-SP

ACTIVE

Radiation-tolerant QMLV, 40-V input, 0.5-A dual-output 500-kHz PWM controller

Product details

Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/6.95 Operating temperature range (°C) -55 to 125 Rating Space Gate drive (typ) (A) 0.5 Vin (max) (V) 40 Radiation, SEL (MeV·cm2/mg) Bipolar
Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/6.95 Operating temperature range (°C) -55 to 125 Rating Space Gate drive (typ) (A) 0.5 Vin (max) (V) 40 Radiation, SEL (MeV·cm2/mg) Bipolar
CDIP (J) 16 135.3552 mm² 19.56 x 6.92 CFP (W) 16 69.319 mm² 10.3 x 6.73 DIESALE (KGD) See data sheet LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • QML-V Qualified, SMD 5962-86806
  • 5962P8680603VxA:
    • 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
  • Automatic Feed-Forward Compensation
  • Programmable Pulse-by-Pulse Current Limiting
  • Automatic Symmetry Correction in Push-Pull Configuration
  • Enhanced Load Response Characteristics
  • Parallel-Operation Capability for Modular Power Systems
  • Differential Current-Sense Amplifier With Wide Common-Mode Range
  • Double-Pulse Suppression
  • 500-mA (Peak) Totem-Pole Outputs
  • ±1% Bandgap Reference
  • Undervoltage Lockout (UVLO)
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation
  • QML-V Qualified, SMD 5962-86806
  • 5962P8680603VxA:
    • 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
  • Automatic Feed-Forward Compensation
  • Programmable Pulse-by-Pulse Current Limiting
  • Automatic Symmetry Correction in Push-Pull Configuration
  • Enhanced Load Response Characteristics
  • Parallel-Operation Capability for Modular Power Systems
  • Differential Current-Sense Amplifier With Wide Common-Mode Range
  • Double-Pulse Suppression
  • 500-mA (Peak) Totem-Pole Outputs
  • ±1% Bandgap Reference
  • Undervoltage Lockout (UVLO)
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation

The UC1846-SP control devices provide all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel power modules while maintaining equal current sharing.

Protection circuitry includes built-in UVLO and programmable current limit in addition to soft-start capability. A shutdown function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully latched operation, double-pulse suppression, deadline adjust capability, a ±1% trimmed bandgap reference, and low outputs in the OFF state.

The UC1846-SP control devices provide all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel power modules while maintaining equal current sharing.

Protection circuitry includes built-in UVLO and programmable current limit in addition to soft-start capability. A shutdown function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully latched operation, double-pulse suppression, deadline adjust capability, a ±1% trimmed bandgap reference, and low outputs in the OFF state.

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Technical documentation

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Type Title Date
* Data sheet UC1846-SP Class-V, Radiation Hardened PWM Controller datasheet (Rev. D) PDF | HTML 14 Dec 2016
* Radiation & reliability report UC1846-SP Neutron Displacement Damage (NDD) Characterization Report 29 Oct 2021
* SMD UC1846-SP SMD 5962-86806 08 Jul 2016
* Radiation & reliability report UC1846-SP Radiation Test Report 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
Technical article Power Tips: Calculate an R-C snubber in seven steps PDF | HTML 05 May 2016

Design & development

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

Simulation model

UC1846 TINA-TI Transient Reference Design

SLUM213.TSC (829 KB) - TINA-TI Reference Design
Simulation model

UC1846 TINA-TI Transient Spice Model

SLUM214.ZIP (14 KB) - TINA-TI Spice Model
Simulation model

UCx846 Family PSpice Transient Model

SLUM099.ZIP (54 KB) - PSpice Model
Package Pins Download
CDIP (J) 16 View options
CFP (W) 16 View options
DIESALE (KGD)
LCCC (FK) 20 View options

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