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CS1631-FSZ bảng dữ liệu(PDF) 5 Page - Cirrus Logic |
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5 / 56 page CS1630/31 DS954F2 5 2. PIN DESCRIPTION Pin Name Pin # I/O Description BSTAUX 1IN Boost Zero-current Detect — Boost Inductor demagnetization sensing input for zero-current detection (ZCD) information. The pin is connected to the PFC boost inductor auxiliary winding through an external resistor divider. IAC 2IN Rectifier Voltage Sense — A current proportional to the rectified line voltage is fed into this pin. The current is measured with an A/D converter. CLAMP 3OUT Voltage Clamp Current Source — Connect to a voltage clamp circuit on the output of the boost stage. SGND 4PWR Source Ground — Common reference current return for the SOURCE pin. SOURCE 5IN Source Switch — Connected to the source of the boost stage external high-voltage FET. SDA 6 I/O I2C™ Data — I2C data. SCL 7IN I2C™ Clock — I2C clock. NC 8- No Connection — Leave pin unconnected. SYNC 9OUT Second Stage Synchronization — A digital synchronization signal that indicates which channel the controller is signaling for each gate switching period. eOTP 10 IN External Overtemperature Protection — Connect an external NTC thermistor to this pin, allowing the internal A/D converter to sample the change to NTC resistance. FBSENSE 11 IN Second Stage Current Sense — The current flowing in the second stage FET is sensed across a resistor. The resulting voltage is applied to this pin and digitized for use by the second stage computational logic to determine the FET's duty cycle. GND 12 PWR Ground — Common reference. Current return for both the input signal portion of the IC and the gate driver. GD 13 OUT Gate Driver — Gate drive for the second stage power FET. VDD 14 PWR IC Supply Voltage — Connect a storage capacitor to this pin to serve as a reservoir for operating current for the device, including the gate drive current to the power transistor. FBAUX 15 IN Second Stage Zero-current Detect — Second stage inductor sensing input. The pin is connected to the second stage inductor’s auxiliary winding through an external resistor divider. BSTOUT 16 IN Boost Output Voltage Sense — A current proportional to the boost output is fed into this pin. The current is measured with an A/D converter. I2C Clock Source Switch Source Ground Boost Zero-current Detect Rectifier Voltage Sense No Connection SCL SDA I2C Data SOURCE SGND BSTAUX eOTP FBSENSE GND GD Gate Driver VDD IC Supply Voltage FBAUX Second Stage Zero-current Detect BSTOUT Boost Output Voltage Sense IAC CLAMP Voltage Clamp Current Source 16-lead SOIC NC SYNC 7 6 5 4 3 2 1 10 11 12 13 14 15 16 8 9 External Overtemperature Protection Second Stage Current Sense Ground Second Stage Synchronization Figure 2. CS1630/31 Pin Assignments |
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