IRS2530D LED DRIVER

IRSD Operation The IRSD dimming control IC includes the feedback control circuit described above, as well as all of the necessary functions to preheat and ignite the lamp and to protect against fault conditions such as open-filament failures, lamp non-strike and mains brown-out. There are many other dimming applications for various end-lighting uses. The lamp filaments are preheated as the frequency decreases and the lamp voltage and load current increase Figure 2. If the ac line is removed for more than one second, the dimming level will not change. The frequency keeps decreasing until the lamp voltage exceeds the lamp ignition voltage threshold and the lamp ignites. For further reading on power conversion in lighting applications, see the How2Power Design Guide, and search the Application category and the Lighting subcategory.

Uploader: Samular
Date Added: 22 September 2014
File Size: 14.92 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 41284
Price: Free* [*Free Regsitration Required]

If the dc reference is decreased, the valley will decrease below COM.

Block diagram of dimming electronic ballast. The complete reference design Figure 7 shows the through-hole components mounted on the top-side and the surface-mounted components on the bottom side not shown.

The microcontroller IC2 generates a square-wave voltage at pin 5 that is RC-filtered to produce the dc dimming reference voltage at the DIM pin. The high-frequency ac square-wave voltage then drives the resonant tank circuit and becomes filtered to produce a sinusoidal current and voltage at the lamp.

Once the lamp ignites, the lamp current is controlled such that the lamp runs at the desired power and brightness level.

Electronic ballasts for dimming fluorescent lamps require a control interface for the user to set the desired lamp-brightness level. The lamp requires a current to preheat the filaments, a high-voltage signal for ignition, and a high-frequency ac current to maintain operation during the running mode. During pre-ignition, the resonant tank is a series-LC circuit with a high Q-factor.

During DIM mode, the IRSD adjusts the oscillator frequency in order to maintain the amplitude of this feedback signal and control the lamp current for dimming. The lamp arc current is detected through Irs2530x after ignition and coupled onto a dc reference voltage to provide ifs2530d ac signal with a dc offset at the DIM pin of IC1. A microcontroller and pulse detection circuit is used to sense each recycling of the ac line voltage, change the dimming reference, and store the previous dimming irs2503d.

TOP Related Posts  PCG 6S4M DRIVER

The higher the oed cycle, the higher the DIM pin voltage and the higher the brightness level. In each case, only the interface circuit needs to be designed such that it generates the correct dc reference voltage to the dimming control IC. When the CFL is first turned on, the control IC sweeps the half-bridge frequency from the maximum frequency down towards the resonance frequency of the high-Q ballast output stage. The IRSD dimming control IC includes the feedback control circuit described above, as well as all of the necessary functions to preheat and ignite the lamp and to protect against fault conditions such as open-filament failures, lamp non-strike and mains brown-out.

To dim the fluorescent lamp, the ler of the half-bridge is increased, causing the gain of the resonant tank circuit to decrease and therefore the lamp current to decrease. Prior to that, Tom was e mployed by Irs25330d Lighting Components in Switzerland where he designed dimmable electronic ballast systems for a variety of applications.

ליאון אלקטרוניקה – REF DESIGN KIT, IRSD ELECTRONIC BALLAST

When the ac line is switched off, IC2 detects this rapidly and starts a timer. This circuitry includes a dimming reference signal, a lamp-current sensing and feedback signal, and a summing circuit for closed-loop control of the lamp current.

The frequency keeps decreasing until the lamp voltage exceeds the lamp ignition voltage threshold and the lamp ignites. The IRSD dimming control IC enables a simple and low-cost solution that can be used for a wide variety of dimming applications. Schematic of four-level switch dimming circuit. IRSD Operation The IRSD dimming control IC includes the feedback control irs530d described above, as well as all of the necessary functions to preheat and ignite the lamp and to protect against fault conditions such as open-filament failures, lamp non-strike and mains brown-out.

TOP Related Posts  ASUS F3F WIRELESS DRIVERS

The lamp filaments are preheated as the frequency decreases and the lamp voltage and load current increase Figure 2.

IRS2530DSTRPBF IC DIMMING BALLAST CTRL 8-SOIC IRS2530DSTRPBF 2530 IRS2530 IRS2530D IRS2530DS 2530D

After VDD has discharged below the minimum operating voltage of IC2 the microcontroller will shut off. After ignition and during the running mode, the tank is a series-L, parallel-RC circuit with a Q-factor somewhere between a high and low value depending on the lamp dimming level. Each of these interface circuits requires additional wiring to each ballast during installation, a special lamp socket or wall dimmer, ris2530d an additional signal processing unit.

The VDD supply capacitor C1 is large enough to allow IC2 to continue to run for more than one second after the ac line has been removed.

For further reading on power conversion in lighting applications, see the How2Power Design Guide, and search the Application category and the Lighting subcategory. The additional circuit block required for dimming is also shown.

This simplification of the ballast circuitry allows designers to focus their creativity on developing the different types of dimming interfaces required for each new application. A closed-loop feedback circuit is then used to ld the lamp current and regulate the current to the dimming reference level by continuously adjusting the half-bridge operating frequency.

Block diagram of four-level switch-dimming ballast. This causes the amplitude of the lamp current to then increase or decrease for dimming.