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UC1842A

ACTIVE

Current Mode PWM Controller

Product details

Topology Boost, Flyback, Forward Control mode Current Duty cycle (max) (%) 100 Switching frequency (max) (kHz) 500 Features Error amplifier, Multi-topology UVLO thresholds on/off (V) 16/10 Operating temperature range (°C) -55 to 125 Rating Military Gate drive (typ) (A) 1 Vin (max) (V) 25
Topology Boost, Flyback, Forward Control mode Current Duty cycle (max) (%) 100 Switching frequency (max) (kHz) 500 Features Error amplifier, Multi-topology UVLO thresholds on/off (V) 16/10 Operating temperature range (°C) -55 to 125 Rating Military Gate drive (typ) (A) 1 Vin (max) (V) 25
CDIP (JG) 8 64.032 mm² 9.6 x 6.67 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • 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
  • Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer
  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • 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
  • Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, 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

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Type Title Date
* Data sheet UCx84xA Current-Mode PWM Controller datasheet (Rev. G) PDF | HTML 12 Jul 2022
* SMD UC1842A SMD 5962-86704 21 Jun 2016
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 05 Sep 1999
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences 05 Sep 1999
Application note DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection 05 Sep 1999
Application note DN-30 Programmable Electronic Circuit Breaker 05 Sep 1999
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 05 Sep 1999
Application note DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 05 Sep 1999
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05 Sep 1999

Design & development

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

Simulation model

UCC28C42 PSpice Transient Model

SLVM049.ZIP (101 KB) - PSpice Model
Simulation model

UCCx8C42 Unencrypted PSpice Transient Model

SLUM522.ZIP (4 KB) - PSpice Model
Package Pins Download
CDIP (JG) 8 View options
LCCC (FK) 20 View options

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