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Product details

Parameters

Topology Boost, Flyback, Forward Control method Current VCC (Min) (V) 12 VCC (Max) (V) 25 Duty cycle (Max) (%) 100 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 HiRel Enhanced Product open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other PWM controllers & resonant controllers

Features

  • Controlled Baseline
    • One Assembly/Test Site, One Fabrication Site
  • Extended Temperature Performance of –55°C to 125°C
  • Enhanced Diminishing Manufacturing Sources (DMS) Support
  • Enhanced Product Change Notification
  • Qualification Pedigree(1)
  • Optimized for Off-line and DC-to-DC Converters
  • Low Start Up Current (<0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Under-Voltage Lockout With Hysteresis
  • Double Pulse Suppression
  • High Current Totem Pole Output
  • Internally Trimmed Bandgap Reference
  • 500 kHz Operation
  • Low RO Error Amp

(1) Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.

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Description

The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 18
Type Title Date
* Datasheet Current-Mode PWM Controller. datasheet (Rev. D) Jan. 14, 2013
* VID UC1842A-EP VID V6203625 Jun. 21, 2016
* VID UC1842A-EP VID V6203625 Jun. 21, 2016
* VID UC1842A-EP VID V6203625 Jun. 21, 2016
* VID UC1842A-EP VID V6203625 Jun. 21, 2016
* Radiation & reliability report UC1842AMDREP Reliability Report Dec. 22, 2014
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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CAD/CAE symbols

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SOIC (D) 8 View options

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  • Ongoing reliability monitoring

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