The UCC3817A and UCC3818A families provide all the features necessary for active power factor correction preregulators. The controller realizes that by shaping the AC input current waveform, the corresponding AC input line voltage, the power factor is close. Average current mode control maintains stable, low-distortion sinusoidal line current.
Designed in Texas Instruments' BiCMOS process, the UCC3817A/UCC3818A provide new features such as low start-up current, reduced power consumption, overvoltage protection, undervoltage lockout detection shunt circuit, leading modulation techniques to reduce bulk capacitance with ripple current through improved, low-offset (± 2 millivolt) current amplifiers to reduce distortion at light load conditions.
characteristic
- Controls the boost preregulator to near power factor
- Distortion of the boundary
- World Wide network cable runs
- Overvoltage protection
- Precise power limiting
- Average current mode control
- Improved immunity to interference
- Improved feed-forward line adjustment
- Leading edge modulation
- Typical start-up current of 150μA
- Low-power BiCMOS operation
- 12 V to 17 V operation
- The frequency range of 6 kHz is 220 kHz
| |
UCC3818A |
| On/Off of Undervoltage Lockout Threshold (5) |
10.5/10 |
| Operating power supply (max) (5) |
18 |
| Starting current (mA) |
0.15 |
| Operating Supply Current (mA) |
4 |
| Vref's (V) |
7.5 |
| Thor of Vref (%) |
1.5 |
| Duty cycle (max.) (%) |
100 |
| Actual operating frequency (max) (MHz) |
0.25 |
| Pins/Packets |
16PDIP，16TSSOP，16SO |