Electronic Components Datasheet Search |
|
CS1616 Datasheet(PDF) 8 Page - Cirrus Logic |
|
CS1616 Datasheet(HTML) 8 Page - Cirrus Logic |
8 / 16 page CS1615/16 8 DS961F1 5. GENERAL DESCRIPTION 5.1 Overview The CS1615 and CS1616 are high-performance single stage dimmable offline AC/DC controllers. The CS1615/16 is a cost- effective solution that provides unmatched single- and multi-lamp dimmer-compatibility performance for dimmable LED applications. The CS1615 is designed for 120VAC line voltage applications, and the CS1616 is designed for 230VAC line voltage applications. Across a broad range of dimmers, the CS1615/16 provides smooth flicker free dimming, and consistently dims to nearly zero light output, which closely matches the dimming performance of incandescent light bulbs. Cirrus Logic’s patent pending approach to dimmer compatibility provides full functionality on a wide range of dimmers, including leading-edge, trailing-edge, and digital dimmers. 5.2 IC Startup A high-voltage source-follower circuit is used to deliver startup current to the IC. During steady-state operation, an auxiliary winding on the transformer/inductor biases this circuit to an off state to improve system efficiency, and all IC supply current is provided from the auxiliary winding. The patent-pending technology of the high-voltage source-follower circuit enables system compatibility with digital dimmers (dimmers containing an internal power supply) by providing a continuous path for the dimmer’s power supply to recharge during its off state. During steady-state operation, high-voltage FET Q1 in this circuit is source-controlled by a variable internal current source on the SOURCE pin to create the dimmer-compatibility circuit. A Schottky diode with a forward voltage of less than 0.6V is recommended for diode D1. Schottky diode D1 will limit inrush current through the internal diode, preventing damage to the IC. During initial power-up, the IC executes a fast startup algorithm, which drives the converter with peak currents that are above normal to charge the output capacitor. Once the output capacitor reaches a defined voltage, the IC drives the converter with nominal peak currents until normal operation is achieved. 5.3 IC Operation 5.3.1 Dimmer Detection The CS1615/16 dimmer switch detection algorithm determines if a non-dimming switch, a leading-edge dimmer switch, or a trailing-edge dimmer switch controls the solid-state lighting (SSL) system. For each type of switch, the IC uses a different operating mode: for a non-dimming switch, No-dimmer Mode is used; for a leading-edge dimmer switch, Leading-edge Mode is used; for a trailing-edge dimmer switch, Trailing-edge Mode is used. As a result, the overall performance is optimized in terms of power losses, efficiency, power factor, THD, and dimmer compatibility. When the IC completes UVLO, it executes in Leading-edge Mode until the dimmer switch detection algorithm determines the appropriate operating mode for the IC. The dimmer switch detection algorithm uses the input line voltage slope and dimmer phase angle to determine the operating mode that matches the type of dimmer switch in the system. From there on, it periodically learns the dimmer type and can change the operating mode if the type of dimmer switch changes. 5.3.1.1 No-dimmer Mode If the CS1615/16 determines that the line is not phase cut by a dimmer switch, the IC operates the flyback/buck-boost in PFC mode to achieve a power factor greater than 0.9 while regulating the load current to a level set by resistor RCTRL2. In addition, a No-dimmer Mode algorithm is applied to the source-controlled dimmer-compatibility circuit for optimal performance, including less than 20% of THD and highest possible overall efficiency. 5.3.1.2 Leading-edge Mode If the CS1615/16 determines that the line is phase cut by a leading-edge dimmer switch, the IC operates the flyback/buck- boost in Dimmer Mode and the IC sets the dimmer firing current as well as the attach current using a source-controlled dimmer- compatibility circuit for stable TRIAC dimmer operation. 5.3.1.3 Trailing-edge Mode If the CS1615/16 determines that the line is phase cut by a trailing-edge dimmer switch, the IC operates the flyback/buck- boost in Dimmer Mode. The IC charges the capacitor in the Figure 9. No-dimmer Mode Waveform Figure 10. Leading-edge Mode Phase-cut Waveform |
Similar Part No. - CS1616 |
|
Similar Description - CS1616 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |