UC1844-SP

ACTIVE

Space-grade, single ended 500-kHz current mode PWM controller with 16-V/10-V UVLO 50% duty cycle

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Product details

Parameters

Topology Boost, Flyback, Forward Control method Current VCC (Min) (V) 12 VCC (Max) (V) 30 Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) 16/10 Frequency (Max) (kHz) 500 Operating temperature range (C) -55 to 125 Gate drive (Typ) (A) 1 Features Error Amplifier, Multi-topology Rating Space open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

LCCC (FK) 20 79 mm² 8.89 x 8.89 open-in-new Find other PWM controllers & resonant controllers

Features

  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500-kHz operation
  • Error amplifier with low output resistance

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Description

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet UCx84x Current-Mode PWM Controllers datasheet (Rev. F) Apr. 28, 2020
* SMD UC1844-SP SMD 5962-86704 Jul. 08, 2016
Selection guide TI Space Products (Rev. H) Jan. 27, 2021
Application note Controlling Input Power for Present and Next-Generation Power Controllers Dec. 14, 2020
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
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers Feb. 07, 2002
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit Sep. 05, 1999
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences Sep. 05, 1999
Application note DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection Sep. 05, 1999
Application note DN-30 Programmable Electronic Circuit Breaker Sep. 05, 1999
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty Sep. 05, 1999
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode Sep. 05, 1999
Application note DN-65 Considerations in Powering BiCMOS ICs Sep. 05, 1999
Application note DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers Sep. 05, 1999
Application note Modeling, Analysis and Compensation of the Current-Mode Converter Sep. 05, 1999
Application note U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control Sep. 05, 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies Sep. 05, 1999

Design & development

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LCCC (FK) 20 View options

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