Calculation tool
UCC28221
Automotive Dual Interleaved 2MHz PWM controller with Programmable max duty cycle 13V/8V UVLO
Data sheet
UCC28221
- 2-MHz High-Frequency Oscillator With 1-MHz Operation Per Channel
- Matched Internal Slope Compensation Circuits
- Programmable Maximum Duty Cycle Clamp 60% to 90% Per Channel
- Peak Current Mode Control With Cycle-by-Cycle Current Limit
- Current Sense Discharge Transistor for Improved Noise Immunity
- Accurate Line Undervoltage and Overvoltage Sense With Programmable Hysteresis
- Opto-Coupler Interface
- 110-V Internal Start-Up JFET (UCC28221)
- Operates From 12-V Supply (UCC28220)
- Programmable Soft Start
The UCC28220 and UCC28221 are a family of BiCMOS interleaved dual channel PWM controllers. Peak current mode control is used to ensure current sharing between the two channels. A precise maximum duty cycle clamp can be set to any value between 60% and 90% duty cycle per channel.
The UCC28220 has an UVLO turnon threshold of
10 V for use in 12-V supplies while UCC28221 has a turnon threshold of 13 V for systems needing wider UVLO hysteresis. Both have 8-V turnoff thresholds.
Additional features include a programmable internal slope compensation with a special circuit which is used to ensure exactly the same slope is added to each channel and a high-voltage 110-V internal JFET for easier start-up for the wider hysteresis UCC28221 version.
The UCC28220 is available in both 16-pin SOIC and low-profile TSSOP packages. The UCC28221 also comes in 16-pin SOIC package and a slightly larger 20-pin TSSOP package to allow for high-voltage pin spacing to meet UL1950 creepage clearance safety requirements.
Technical documentation
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View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC2822x Interleaved Dual PWM Controller With Programmable Max Duty Cycle datasheet (Rev. G) | PDF | HTML | 06 Apr 2017 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | 200-W Interleaved Forward Converter Design Review Using TI's UCC28221 PWM Contro | 19 Apr 2004 | ||
| More literature | Seminar 300 Topic 8 - Switching Power Supply Design Review | 15 Feb 2001 | ||
| More literature | Seminar 400 Topic 2 - Design of Flyback Transformers and Filter Inductors | 15 Feb 2001 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Calculation tool
UCC28221-CALC — UCC28221 MathCAD Calculation Utility
This Mathcad design tool was developed to use with the UCC28221 application note SLUA312.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 16 | Ultra Librarian |
| TSSOP (PW) | 20 | Ultra Librarian |
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