Product details


Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Control method Current VCC (Min) (V) 12 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) -55 to 125 Gate drive (Typ) (A) 0.5 Features Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Rating HiRel Enhanced Product open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

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


  • 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)
  • Automatic Feed-Forward 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% Bandgap Reference
  • Undervoltage Lockout
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation

(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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The UC1846-EP control IC 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 power modules, 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 bandgap reference.

The UC1846-EP features low outputs in the OFF state.

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Technical documentation

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Type Title Date
* Datasheet UC1846-EP datasheet May 08, 2006
VID UC1846-EP VID V6206606 Jun. 21, 2016
Radiation & Reliability reports UC1846MDWREP Reliability Report Sep. 06, 2013

Design & development

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

Design tools & simulation

SLUM099.ZIP (54 KB) - PSpice Model
SLUM213.TSC (829 KB) - TINA-TI Reference Design
SLUM214.ZIP (14 KB) - TINA-TI Spice Model

CAD/CAE symbols

Package Pins Download
SOIC (DW) 16 View options

Ordering & quality

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