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.
| Topology | Flyback, Forward |
| Control mode | Current |
| Duty cycle (max) (%) | 90 |
| Switching frequency (max) (kHz) | 2000 |
| Features | Adjustable switching frequency, Current limiting, Input line monitor, Multi-topology, Programmable max duty cycle, Programmable slope compensation, Soft start |
| UVLO thresholds on/off (V) | 10/8 |
| Operating temperature range (°C) | -40 to 105 |
| Rating | Catalog |
| Gate drive (typ) (A) | 0.01 |
| Vin (max) (V) | 14.5 |
| SOIC (D) | 16 | 59.4 mm² 9.9 x 6 |
| TSSOP (PW) | 16 | 32 mm² 5 x 6.4 |
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