The UCC2817 and UCC2818 provides all the functions necessary for active power-factor-corrected preregulators. The controller achieves near-unity power factor by shaping the ac-input line current waveform to correspond to that of the ac input line voltage. Average current mode control maintains stable, low-distortion sinusoidal line current.
Designed with TI’s BiCMOS process, the UCC2817 and UCC2818 offers new features, such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor, and an improved, low-offset (±2-mV) current amplifier to reduce distortion at light load conditions.
The UCC2817 offers an on-chip shunt regulator with low start-up current suitable for applications utilizing a bootstrap supply. The UCC2818 is intended for applications with a fixed supply (VCC).
The devices are available in a 16-pin D package.
(1) Additional temperature ranges are available - contact factory
Unitrode Is a trademark of Texas Instruments.
| Topology | Boost |
| Control mode | CCM |
| Switching frequency (max) (kHz) | 250 |
| UVLO thresholds on/off (V) | 10.5/10 |
| Vin (max) (V) | 18 |
| Features | < 150 W applications, > 750 W applications, Average current mode, Continuous Control Mode, Enable, Overvoltage protection |
| Rating | HiRel Enhanced Product |
| Operating temperature range (°C) | -55 to 125 |
| Duty cycle (max) (%) | 100 |
| SOIC (D) | 16 | 59.4 mm² 9.9 x 6 |
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