圖3.CRD1631-9W 9瓦參考設計外形圖

The CS1631 is a 230VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1631 uses a digital control algorithm that is optimized for high efficiency and 0.90 power factor over a wide input voltage range (207VAC to 253VAC). The CS1631 integrates a critical conduction mode (CRM) boost converter that provides power factor correction and dimmer compatibility with a constant output current, quasi-resonant flyback stage. An adaptive dimmer compatibility algorithm controls the boost stage and dimmer compatibility operation mode to enable flicker-free operation to 0% output current with leading-edge, trailing-edge, and digital dimmers. The CS1631’s interleaved 2 channel output allows two independent channel constant current regulation and eliminates additional transformers.

Temperature compensated LED current and color control system with NTC maintains constant color temperature over ambient temperature variation.

The CRD1631-9W board is optimized to deliver low system cost in a high-efficiency, flicker-free, phase-dimmable, solid-state lighting (SSL) solution for incandescent lamp replacement applications. The feedback loop is closed through an integrated digital control system within the IC. The variation in switching frequency and programmable frequency dithering also provides a spread-frequency spectrum, thus minimizing the conducted EMI filtering requirements.

Protection algorithms, such as output open/short, current-sense resistor open/short, and overtemperature thermistors, protect the system during abnormal conditions.

The CRD1631-9W board demonstrates the performance of the CS1631. This reference board has been designed for an output load of 4 white LEDs at 419mA (12.96V typical), and 5 red LEDs at 190mA (10V typical) in series 2 channel output configuration at 25 degree C.

This document provides the schematic for the board. It includes oscilloscope screen shots that indicate various operating waveforms. Graphs are also provided that document the performance of the board in terms of Efficiency vs. Line Voltage, Output Current vs. Line Voltage, and Output Current vs. Dim Angle for the CS1631 dimmable LED controller IC. Extreme caution needs to be exercised while handling this board. This board is to be used by trained professionals only.

2012-5-29 13:21:05 上傳

下載附件 (24.67 KB)

圖4.CRD1631-9W 9瓦參考設計電路圖
CRD1631-9W 9瓦參考設計材料清單:

2012-5-29 13:21:05 上傳

下載附件 (69.87 KB)

The flyback transformer stage is a quasi-resonant peak current-regulated DC-DC converter capable of delivering the highest possible efficiency with constant current output while minimizing line frequency ripple. The auxiliary winding is used for zero-current detection and overvoltage protection.

2012-5-29 13:21:05 上傳

下載附件 (9.71 KB)