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CS1616-FSZ Datasheet(PDF) 2 Page - Cirrus Logic |
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CS1616-FSZ Datasheet(HTML) 2 Page - Cirrus Logic |
2 / 16 page CS1615/16 2 DS961F1 1. INTRODUCTION Figure 1. CS1615/16 Block Diagram A typical schematic using the CS1615/16 IC is shown on the previous page. Startup current is provided from a patent-pending, external, high- voltage source-follower network. In addition to providing startup current, this unique topology is integral in providing compatibility with digital dimmers by ensuring VDD power is always available to the IC. During normal operation, an auxiliary winding on the flyback transformer or buck-boost inductor back-biases the source-follower circuit and provides steady-state operating current to the IC to improve system efficiency. Rectified input voltage Vrect is sensed as a current into pin IAC and is used to control the adaptive dimmer-compatibility algorithm and to extract the phase of the input voltage for output dimming control. The SOURCE pin is used to provide a control signal for the high-voltage source-follower circuit during Leading- edge Mode and Trailing-edge Mode; it also provides the current during startup. The digital dual-mode controller is implemented with peak- current mode primary-side regulation, which eliminates the need for additional components to provide feedback from the secondary and reduces system cost and complexity. Voltage across a user-selected resistor is sensed through pin FBSENSE to control the peak current of the primary-side inductor. Leading- edge and trailing-edge blanking on pin FBSENSE prevents false triggering. The required target LED current and average flyback transformer and buck-boost inductor input current are set by attaching resistors RCTRL1 and RCTRL2 on pins CTRL1 and CTRL2, respectively. The controller ensures half line-cycle averaged constant output current. Pin FBAUX is used for zero-current detection to ensure quasi-resonant switching of the single stage output. When an external negative temperature coefficient (NTC) thermistor is connected to pin eOTP, the CS1615/16 monitors the system temperature, allowing the controller to reduce the output current of the system. If the temperature reaches a designated high set point, the IC is shut down and stops switching. 2 IAC SOURCE 5 SGND 15k ADC Iref 11 FBSENSE + - DAC + - Peak Control 12 GND OLP + - OCP Blank 3 CLAMP VOCP(th) VOLP(th ) VPk_Max (th ) ICLAMP + - VSOURCE(th) MUX 9 + - ICONNECT V CONNE CT(th) 10 CTRL2 8 CTRL1 eOTP FBAUX 16 + - Zero-current Detect + - Output Overvoltage VZCD(th) VOVP(th ) tVAUX 14 VDD + - VDD(on) VDD(off) Voltage Regulator V Z POR 13 GD VDD VDD VDD 4 + - V FS TA RT(th ) 3 |
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