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CS1615-FSZ Datasheet(PDF) 3 Page - Cirrus Logic |
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CS1615-FSZ Datasheet(HTML) 3 Page - Cirrus Logic |
3 / 16 page CS1615/16 DS961F1 3 2. PIN DESCRIPTION Figure 2. CS1615/16 Pin Assignments 16-lead SOIC and TSSOP 16 Zero-current Detect FBAUX 15 No Connect NC 14 IC Supply Voltage VDD 13 GD Gate Drive 10 eOTP External Overtemperature Protection 11 FBSENSE Flyback Current Sense 12 GND Ground 9 LED Load Current CTRL2 No Connect NC 1 2 IAC Rectifier Voltage Sense 3 Voltage Clamp Current Source CLAMP 4 SGND Source Ground 5 Source Switch SOURCE 6 NC No Connect 7 No Connect NC 8 CTRL1 Dimmer Hold Current Pin Name Pin # I/O Description NC 1IN No Connect — Leave pin unconnected. 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 source-switched dimmer-compatibility circuit. SGND 4PWR Source Ground — Common reference current return for the SOURCE pin. SOURCE 5IN Source Switch — Connected to the source of the source-switched external high-volt- age FET. NC 6IN No Connect — Connect this pin to VDD using a 47k pull-up resistor. NC 7IN No Connect — Connect this pin to VDD using a 47k pull-up resistor. CTRL1 8IN Dimmer Hold Current — Connect a resistor to this pin to set the minimum input cur- rent being pulled by the flyback/buck-boost stage. CTRL2 9IN LED Load Current — Connect a resistor to this pin to set the LED current. 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 Feedback Current Sense — The current flowing in the power FET is sensed across a resistor. The resulting voltage is applied to this pin and digitized for use by the compu- tational 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 Drive — Gate drive for the 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 tran- sistor. NC 15 - No Connect — Leave pin unconnected. FBAUX 16 IN Zero-current Detect — Connect to the flyback/buck-boost inductor auxiliary winding for demagnetization current zero-crossing detection. |
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