Product details

Topology Boost, Flyback, Forward, Half-Bridge, Push-Pull Duty cycle (Max) (%) 50 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) 7.7/6.95 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 0.5
Topology Boost, Flyback, Forward, Half-Bridge, Push-Pull Duty cycle (Max) (%) 50 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) 7.7/6.95 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 0.5
PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5
  • Automatic Feedforward 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% Band Gap Reference
  • Undervoltage Lockout
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation
  • Automatic Feedforward 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% Band Gap Reference
  • Undervoltage Lockout
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation

The UC1846/7 family of control devices provides 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 while maintaining equal current sharing. \

Protection circuitry includes built-in undervoltage lockout 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, and a ±1% trimmed band gap reference.

The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state.

The UC1846/7 family of control devices provides 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 while maintaining equal current sharing. \

Protection circuitry includes built-in undervoltage lockout 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, and a ±1% trimmed band gap reference.

The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state.

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Technical documentation

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Type Title Date
* Data sheet UCx846/7 Current Mode PWM Controller datasheet (Rev. C) PDF | HTML 04 Jan 2016
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article When should you use PWM controllers? 02 Dec 2016
Technical article Before digital control, there were general-purpose PWMs 19 Oct 2016
Application note DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs 05 Sep 1999
Application note Modeling, Analysis and Compensation of the Current-Mode Converter 05 Sep 1999
Application note U-93 A New Integrated Circuit for Current Mode Control 05 Sep 1999

Design & development

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Simulation model

UCx846 Family PSpice Transient Model UCx846 Family PSpice Transient Model

Simulation model

UCx846 Unencrypted PSpice Transient Model UCx846 Unencrypted PSpice Transient Model

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PDIP (N) 16 View options
SOIC (DW) 16 View options

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