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UC1843-SP

ACTIVO

Contr. PWM, entr. 30 V, salida única 1 A a 500 kHz, ciclo trab. 100 %, tolerante a radiación, certif

Detalles del producto

Topology Boost, Flyback, Forward Control mode Current Features Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100
Topology Boost, Flyback, Forward Control mode Current Features Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100
LCCC (FK) 20 79.0321 mm² (— mm × — mm) CDIP (JG) 8 64.032 mm² (— mm × — mm) DIESALE (KGD) See data sheet
  • QML-V Qualified, SMD 5962-86704
  • Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free)(1)
  • Controlled Baseline
  • Optimized For Off-line and DC-to-DC Converters
  • Low Start-Up Current (<1 mA)
  • 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) 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 5962-86704
  • Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free)(1)
  • Controlled Baseline
  • Optimized For Off-line and DC-to-DC Converters
  • Low Start-Up Current (<1 mA)
  • 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) 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 UC1843 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state. The under-voltage lockout threshold is 8.4 V and maximum duty cycle range is around 100%.

The UC1843 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state. The under-voltage lockout threshold is 8.4 V and maximum duty cycle range is around 100%.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos QML Class V, Current-Mode PWM Controller datasheet 25/03/2010
* Informe de radiación y confiabilidad UC1843-SP Radiation Test Report 25/11/2014
* SMD UC1843-SP SMD 5962-86704 8/07/2016
Guía de selección TI Space Products (Rev. L) 27/03/2026
Nota sobre la aplicación Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form (Rev. A) PDF | HTML 5/11/2025
Application brief DLA Approved Optimizations for QML Products (Rev. C) PDF | HTML 17/06/2025
Nota sobre la aplicación Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. B) PDF | HTML 10/06/2025
Más documentación TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. B) 20/02/2025
Nota sobre la aplicación QML flow, its importance, and obtaining lot information (Rev. C) 30/08/2023
Nota sobre la aplicación Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19/10/2022
Application brief Controlling Input Power for Present and Next-Generation Power Controllers PDF | HTML 14/12/2020
Nota sobre la aplicación DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 21/08/2020
Libro electrónico Radiation Handbook for Electronics (Rev. A) 21/05/2019
Artículo técnico Power Tips: Calculate an R-C snubber in seven steps PDF | HTML 5/05/2016
Nota sobre la aplicación UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 7/02/2002
Nota sobre la aplicación DN-65 Considerations in Powering BiCMOS ICs 5/09/1999
Nota sobre la aplicación DN-27 UC1842/UC1842A Family - Summary of Functional Differences 5/09/1999
Nota sobre la aplicación DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 5/09/1999
Nota sobre la aplicación DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 5/09/1999
Nota sobre la aplicación DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection 5/09/1999
Nota sobre la aplicación U-111, Practical Considerations in Current Mode Power Supplies 5/09/1999
Nota sobre la aplicación U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 5/09/1999
Nota sobre la aplicación Modeling, Analysis and Compensation of the Current-Mode Converter 5/09/1999
Nota sobre la aplicación DN-30 Programmable Electronic Circuit Breaker 5/09/1999
Nota sobre la aplicación DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 5/09/1999
Nota sobre la aplicación DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 5/09/1999

Diseño y desarrollo

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Modelo de simulación

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Productos y hardware compatibles
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
LCCC (FK) 20 Ultra Librarian
CDIP (JG) 8 Ultra Librarian
DIESALE (KGD) Ultra Librarian

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