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CS1611 Datasheet(PDF) 3 Page - Cirrus Logic |
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CS1611 Datasheet(HTML) 3 Page - Cirrus Logic |
3 / 17 page CS1610/11/12/13 DS929F5 3 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. NC 6IN No Connect — Connect this pin to VDD using a pull-up resistor. NC 7IN No Connect — Connect this pin to VDD using a pull-up resistor. IPK 8IN Boost Peak Current — Connect a resistor to this pin to set the peak current of the boost circuit. FBGAIN 9IN Second Stage Gain — Connect a resistor to this pin to set the switching frequency gain for the second stage. 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. No Connect Source Switch Source Ground Boost Zero-current Detect Rectifier Voltage Sense Boost Peak Current NC NC No Connect SOURCE SGND BSTAUX eOTP External Overtemperature Protection FBSENSE Second Stage Current Sense GND Ground 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 SOICN IPK FBGAIN Second Stage Gain 7 6 5 4 3 2 1 10 11 12 13 14 15 16 8 9 Figure 2. CS1610/11/12/13 Pin Assignments |
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