The UC1861 IC - The 1868 series is ideal for the control of zero-current and zero-voltage switching quasi-resonant converters. The difference between this is from the UVLO threshold and the output selection of members of the various combination device family results. In addition, a single-pulse steering logic configuration scheme is available for both time zero-current systems (UC1865-1868) and zero-voltage switching applications for shutdown time (UC1861-1864).
The main control module implementation includes error amplifier compensation for the entire system cycle, driving a voltage-controlled oscillator (VCO) with programmable minimum and maximum frequencies. Triggered by the VCO, the maximum width of a program is generated at one time, and the zero-modulation pulses can be compared by detecting and comparing.
characteristic
- Controls zero-current switching (zero-current) or zero-voltage switching (zero-voltage switching) quasi-resonant converters
- Zero terminates a single trigger timer
- 1% accuracy, 5V reference for soft start
- Restart failure after programmable delay
- Voltage-controlled oscillators (VCOs) and programmable minimum and maximum frequencies from 10kHz to 1MHz
- Low start-up current (150μA typical)
- Dual 1 amp peak FET drivers
- UVLO options for offline or DC/DC applications
parameter
| |
|
|
UC3863 |
| topology |
|
|
Full bridge, half bridge, push and pull |
| Control method |
|
|
Voltage mode |
| Duty Cycle (Max) (%) |
|
|
50 |
| Frequency (max) (kHz) |
|
|
450 |
| On/off of undervoltage lockout threshold (5) |
|
|
8 / 7 |
| Pin/Pack |
|
|
16PDIP，16SOIC |
| (#) Regulated output |
|
|
2 |
| Operating Temperature Range (°C) |
|
|
0 to 70 |
Microchip Centennial Electronic Technology (Shenzhen) Co., Ltd
Address: 13H, Block A, Huaqiang Plaza, Huaqiang Road, Futian District, Shenzhen
Phone: 0755-83591082
Fax: 0755-83591083
Q Q：1051085817
//www.chip100.com/