UC3854 Chinese information

Probe for current and voltage pin with dimensions 420x4450, featuring a head diameter of 5.0mm. This probe is designed to handle overcurrent conditions and is directly connected to the voltage pin.

Photocoupler used for isolating the high-voltage side from the low-voltage control circuit, ensuring safety and preventing electrical noise interference.

The UC3854AN is a teacher's rate corrector (PFC) integrated circuit with 16 pins. Its primary functions include:
1) GND: Ground terminal
2) PKLMT: Peak limit terminal, connected to the negative voltage terminal of the current sensing resistor. It shuts off the circuit when the current peak exceeds a threshold.
3) CAOUT: Current amplifier CA output
4) ISENSE: Current sensing terminal, internally connected to the negative terminal of the CA input. Externally, it connects to the positive terminal of the current sensing resistor through a resistor.
5) MULT OUT: Multiplier output, which serves as the other end of the current detection. Internally, it outputs to the CA input positive end, while the external end connects to the voltage negative terminal of the current sensing resistor via a resistor.
6) JAC: Input current terminal, internally connected to the multiplier/divider input. Externally, it connects to the positive end of the rectified input voltage.
7) UA Out: Voltage amplifier UA output, internally connected to the multiplier/divider input. Externally, it connects to an RC feedback network.
8) URMS: RMS power supply voltage terminal, internally connected to the square-squared multiplier/divider input. It includes a feedforward function, with an URMS value range of 1.5~4.77V.
9) REF: Reference voltage terminal, generating a 7.5V reference voltage.
10) ENA: Start terminal, controlling circuit voltage, oscillator, and soft start through a logic circuit.
11) USENSE: Output voltage detection terminal, connected to the input negative terminal of the voltage amplifier UA.
12) RSET: External resistor RSET terminal, controlling the oscillator charging current and limiting the multiplier/divider maximum output.
13) SS: Soft starter
14) CT: External capacitor CT terminal, serving as the oscillator timing capacitor, setting the oscillation frequency to f=1.25/RSET*CT.
15) Vcc: Integrated circuit supply voltage Vcc, with a rated value of 22V.
16) GTDRV: Gate drive terminal, connected to the gate of the power MOS switch tube through a resistor, with a terminal potential clamp at 15V.

Download the PDF for UC3854 Control Power Factor Corrector Circuit Design Download the UC3854 PDF Data Sheet

Figure 1: 16-pin Package Diagram

Figure 2: 20-pin Package Diagram

Figure 3: Internal Circuit Diagram

Figure 4: Typical Design Circuit Diagram