The UC1854 provides an active power supply system that would otherwise draw a sinusoidal power line for non-sinusoidal current factor correction. The device implements all the necessary control functions to establish a power supply that makes optimal use of existing power line currents while minimizing the ability to mistort line currents. To do this, the UC1854 contains a voltage amplifier, analog multiplier/divider, current amplifier, and fixed-frequency PWM. In addition, the UC1854 contains a power MOSFET gate driver compatible, 7.5V reference line estimator, load, enable comparator, low supply detector, and overcurrent comparator.
The UC1854 uses an average current control mode to achieve fixed frequency stabilization and low distortion current control.
characteristic
- PWM controls the boost power factor of 0.99
- Limit line current distortion
- Global action, no switches
- Feed-forward line adjustment
- Average current mode control
- Low noise sensitivity
- Low start-up current
- Fixed frequency PWM drive
- Low offset analog multiplier/divider
- 1A Totem pole gate driver
- Precision voltage reference
parameter
| |
|
|
UC3854 |
| On/Off of Undervoltage Lockout Threshold (5) |
|
|
16/10 |
| Operating power supply (max) (5) |
|
|
30 |
| Starting current (mA) |
|
|
1.5 |
| Operating Supply Current (mA) |
|
|
10 |
| Vref's (V) |
|
|
7.5 |
| Thor of Vref (%) |
|
|
1.3 |
| Duty cycle (max.) (%) |
|
|
95 |
| Actual operating frequency (max) (MHz) |
|
|
0.2 |
| Pins/Packets |
|
|
16PDIP，16SOIC，20PLCC |