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UC1846-EP

ACTIVE

Enhanced Product Current-Mode Pwm Controller

Product details

Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/6.95 Operating temperature range (°C) -55 to 125 Rating HiRel Enhanced Product Gate drive (typ) (A) 0.5 Vin (max) (V) 40
Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/6.95 Operating temperature range (°C) -55 to 125 Rating HiRel Enhanced Product Gate drive (typ) (A) 0.5 Vin (max) (V) 40
SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • 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.

  • 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.

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.

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
* Data sheet UC1846-EP datasheet 08 May 2006
* VID UC1846-EP VID V6206606 21 Jun 2016
* Radiation & reliability report UC1846MDWREP Reliability Report 06 Sep 2013

Design & development

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

Simulation model

UC1846 TINA-TI Transient Reference Design

SLUM213.TSC (829 KB) - TINA-TI Reference Design
Simulation model

UC1846 TINA-TI Transient Spice Model

SLUM214.ZIP (14 KB) - TINA-TI Spice Model
Simulation model

UCx846 Family PSpice Transient Model

SLUM099.ZIP (54 KB) - PSpice Model
Package Pins Download
SOIC (DW) 16 View options

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