IRS2530D LED DRIVER

The board is a two-layer design with a very small form factor for driving a W fluorescent lamp. 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. Prior to that, Tom was e mployed by Knobel Lighting Components in Switzerland where he designed dimmable electronic ballast systems for a variety of applications. The additional circuit block required for dimming is also shown. The lamp filaments are preheated as the frequency decreases and the lamp voltage and load current increase Figure 2. If the dimming level was already at minimum then it will cycle back to maximum. Block diagram of four-level switch-dimming ballast.

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Figure 6 shows the microcontroller PWM output for each dimming level and the corresponding waveforms for lamp voltage and current. The frequency keeps decreasing until the lamp voltage exceeds the lamp ignition voltage threshold and the lamp ignites. During pre-ignition, the resonant tank is a series-LC circuit with a high Q-factor. Existing interface circuits include a 1-toVdc interface, digitally-addressable lighting interface DALItriac-based wall dimmers, three-way lamp sockets, power line communications, and wireless communications.

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. When the ac line is switched off, IC2 detects this rapidly and starts a timer.

Ler lamp filaments are preheated as the frequency decreases and the lamp voltage and load current increase Figure 2. The board is a two-layer design with a very small form factor for driving a W fluorescent lamp.

ליאון אלקטרוניקה – REF DESIGN KIT, IRSD ELECTRONIC BALLAST

The complete ballast control, dimming feedback loop and fault protection are included in the IC, so few external components are needed. The full application circuit is shown in Figure 5. The four-level switch-dimming circuit described in this article is only one application where dimming can be achieved without additional wiring.

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This causes the amplitude of the lamp current to then increase or decrease for dimming. The IRSD provides all of the necessary ballast functions, fault detection and dimming control required for operation of fluorescent lamps.

The feedback circuit will then increase the frequency to decrease the gain of the resonant tank until the valley reaches COM again. 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.

A complete set of schematics and waveforms is included to help designers better understand and design the new circuit. Each of these interface circuits requires additional wiring to each ballast during installation, a special lamp socket or wall dimmer, or an additional signal processing unit.

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. 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 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.

If the ac line is removed for more than one second, the dimming level will not change. Block diagram of dimming electronic ballast. Schematic of four-level switch dimming circuit.

A closed-loop feedback circuit is then used to measure the lamp current and regulate the current to the dimming reference level by continuously adjusting the half-bridge operating frequency. To fulfill these requirements, the electronic ballast circuit first performs a low-frequency ac-dc conversion at the input, irs530d by a high-frequency dc-ac conversion at the output. The additional circuit block required for dimming is also shown. 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 irs2530c protect against fault conditions such as open-filament failures, lamp non-strike and mains brown-out.

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The dimming function is realized by irss2530d the ac-lamp-current measurement Figure 3 with the dc reference voltage at a single node. 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 lamp arc current is is2530d through RCS after ignition and coupled onto a dc reference voltage to provide an ac signal with a dc offset at the DIM pin of IC1. There are many other dimming applications for various end-lighting uses.

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

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. Lev ballasts for dimming fluorescent lamps require a control interface for the user to set the desired lamp-brightness level. 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. Prior to that, Tom was e mployed by Knobel Lighting Components in Switzerland where he designed dimmable electronic ballast systems for a variety of applications.