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UC3847

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Dual ended 500KHz current mode PWM controller with high outputs in off State, 0C to 70C

UC3847 is in the process of being discontinued
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UC3846 ACTIVE Dual ended 500KHz current mode PWM controller, 0C to 70C Replacement

Product details

Topology Boost, Flyback, Forward, 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) 0 to 70 Rating Catalog Gate drive (typ) (A) 0.5 Vin (max) (V) 40
Topology Boost, Flyback, Forward, 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) 0 to 70 Rating Catalog Gate drive (typ) (A) 0.5 Vin (max) (V) 40
SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • 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
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

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

Simulation model

UCx847 Family Unencrypted PSpice Transient Model Package (Rev. A)

SLUM100A.ZIP (49 KB) - PSpice Model
Simulation model

UCx847 Unencrypted PSpice Transient Model

SLUM633.ZIP (2 KB) - PSpice Model
Package Pins Download
SOIC (DW) 16 View options

Ordering & quality

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Information included:
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