UC3846

ACTIVE

Dual ended 500KHz current mode PWM controller, 0C to 70C

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Product details

Parameters

Topology Boost, Flyback, Forward, Half-Bridge, Push-Pull Control method Current VCC (Min) (V) 7.7 VCC (Max) (V) 40 Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) 7.7/6.95 Frequency (Max) (kHz) 500 Operating temperature range (C) 0 to 70 Gate drive (Typ) (A) 0.5 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other PWM controllers & resonant controllers

Features

  • 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
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Description

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

Design & development

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

Design tools & simulation

SIMULATION MODEL Download
SLUM099.ZIP (54 KB) - PSpice Model
SIMULATION MODEL Download
SLUM632.ZIP (2 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SOIC (DW) 16 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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