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IW3612-00 Datasheet(PDF) 8 Page - Dialog Semiconductor |
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IW3612-00 Datasheet(HTML) 8 Page - Dialog Semiconductor |
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8 / 18 page  iW3612 AC/DC Digital Power Controller for Dimmable LED Drivers Rev. 1.6 iW3612 Page 8 The iW3612 is a high performance AC/DC off-line power supply controller for dimmable LED luminaires, which uses advanced digital control technology to detect the dimmer type and dimmer phase to control the LED brightness. A PWM-dimming scheme is used to modulate the LED current with a dimming frequency of 900Hz at low dimming levels. iW3612 can work with all types of wall dimmers including leading-edge dimmer, trailing-edge dimmer, as well as dimmer configurations such as R-type, R-C type or R-L type without visible flicker. The controller can also work when no dimmer is connected. iW3612 operates in quasi-resonant mode to provide high efficiency and simplify EMI design. In addition, the iW3612 includes a number of key built-in protection features. Using iWatt’s state-of-the-art primary-feedback technology, the iW3612 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. iW3612 also eliminates the need for loop compensation components while maintaining stability over all operating conditions. Pulse-by-pulse waveform analysis allows for accurate LED current regulation. Hence, the iW3612 can provide high performance dimming solutions, with minimal external component count and low bill of materials cost. 9.1 Pin Detail Pin 1 – OUTPUT(TR) Gate drive for the chopping circuit MOSFET switch. Pin 2 – V SENSE Sense signal input from auxiliary winding. This provides the secondary voltage feedback used for output regulation. Pin 3 – V IN Sense signal input from the rectified line voltage. V IN is used for dimmer phase detection. The input line voltage is scaled down using a resistor network. It is used for input under-voltage and over-voltage protection. This pin also provides the supply current to the IC during start-up. Pin 4 – V T External power limit and shutdown control. If the shutdown control is not used, this pin should be connected to GND via a resistor. Pin 5 – GND Ground. Pin 6 – I SENSE Primary current sense. Used for cycle by cycle peak current control. Pin 7 – OUTPUT Gate drive for the external MOSFET switch. Pin 8 – V CC Power supply for the controller during normal operation. The controller will start-up when V CC reaches 12V (typical) and will shut down when the V CC voltage is below 7.5V (typical). High-frequencytransientsandripplescanbeeasilygenerated on the V CC pin due to power supply switching transitions, and line and load disturbances. Excess ripples and noises on V CC may cause the iW3612 to function undesirably, hence a decoupling capacitor should be connected between the V CC pin and GND. A ceramic capacitor of minimum 0.1uF connected as close as possible to the V CC pin is suggested. 9.2 Wall Dimmer Detections There are two types of wall dimmers: leading-edge dimmer and trailing-edge dimmer. AC line before Wall- dimmer AC line after Wall-dimmer Figure 9.1 : Leading-Edge Wall Dimmer Waveforms 9.0 Theory of Operation |
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