Product details

Topology Boost, Flyback, Forward Duty cycle (Max) (%) 93 Supply voltage (Max) (V) 15 UVLO thresholds on/off (V) 8.8/8.2 Features Multi-topology Operating temperature range (C) -40 to 85 Rating Catalog Frequency (Max) (kHz) 4000 Gate drive (Typ) (A) 0.02
Topology Boost, Flyback, Forward Duty cycle (Max) (%) 93 Supply voltage (Max) (V) 15 UVLO thresholds on/off (V) 8.8/8.2 Features Multi-topology Operating temperature range (C) -40 to 85 Rating Catalog Frequency (Max) (kHz) 4000 Gate drive (Typ) (A) 0.02
PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 VSSOP (DGK) 8 15 mm² 3 x 4.9
  • Greater Than 4-MHz Operation
  • Integrated Oscillator / Voltage Feed Forward Compensation
  • >4:1 Input Voltage Range
  • 25-ns Current Limit Delay
  • Programmable Maximum Duty Cycle Clamp
  • Optocoupler Interface
  • 50-µA Start-Up Current
  • 4.2-mA Operating Current @ 1 MHz
  • Smallest Footprint of the 8-pin MSOP Package Minimizes
    Board Area and Height

  • Greater Than 4-MHz Operation
  • Integrated Oscillator / Voltage Feed Forward Compensation
  • >4:1 Input Voltage Range
  • 25-ns Current Limit Delay
  • Programmable Maximum Duty Cycle Clamp
  • Optocoupler Interface
  • 50-µA Start-Up Current
  • 4.2-mA Operating Current @ 1 MHz
  • Smallest Footprint of the 8-pin MSOP Package Minimizes
    Board Area and Height

The UCC35705 and UCC35706 devices are 8-pin voltage mode primary side controllers with fast over-current protection. These devices are used as core high-speed building blocks in high performance isolated and non-isolated power converters.

UCC35705/UCC35706 devices feature a high speed oscillator with integrated feed-forward compensation for improved converter performance. A typical current sense to output delay time of 25 ns provides fast response to overload conditions. The IC also provides an accurate programmable maximum duty cycle clamp for increased protection which can also be disabled for the oscillator to run at maximum possible duty cycle.

Two UVLO options are offered. The UCC35705 with lower turn-on voltage is intended for dc-to-dc converters while the higher turn-on voltage and the wider UVLO range of the UCC35706 is better suited for offline applications.

The UCC35705/UCC35706 family is offered in 8-pin MSOP (DGK), SOIC (D) and PDIP (P) packages.

The UCC35705 and UCC35706 devices are 8-pin voltage mode primary side controllers with fast over-current protection. These devices are used as core high-speed building blocks in high performance isolated and non-isolated power converters.

UCC35705/UCC35706 devices feature a high speed oscillator with integrated feed-forward compensation for improved converter performance. A typical current sense to output delay time of 25 ns provides fast response to overload conditions. The IC also provides an accurate programmable maximum duty cycle clamp for increased protection which can also be disabled for the oscillator to run at maximum possible duty cycle.

Two UVLO options are offered. The UCC35705 with lower turn-on voltage is intended for dc-to-dc converters while the higher turn-on voltage and the wider UVLO range of the UCC35706 is better suited for offline applications.

The UCC35705/UCC35706 family is offered in 8-pin MSOP (DGK), SOIC (D) and PDIP (P) packages.

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Technical documentation

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Type Title Date
* Data sheet High Speed Voltage Mode Pulse Width Modulator datasheet (Rev. B) 15 Oct 2010
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018

Design & development

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

Calculation tool

UCC35705OR6CALC — Free tool: UCC35705/6 Design-in Calculator

This design utility allows the user to calculate the component values for RT, RDISCH and RFF for a choosen value of CT when designing with the UCC35705 or UCC35706. Calculations are given for both Duty Cycle Clamp and Maximum Duty Cycle configurations.
Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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