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AN3372 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN3372 Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 37 page  AN3372 General circuit description Doc ID 018625 Rev 1 5/37 1 General circuit description The block diagram of the ballast is shown in Figure 2. The complete circuit is composed of two stages: ● The boost converter which regulates the DC bus voltage and corrects the power factor. ● The inverter stage composed of a full bridge that converts the DC current coming from the PFC stage into an AC current for the lamp. Operation mode of the full bridge realizes a buck converter. The full bridge, moreover, supplies the igniter block to generate the high voltage pulses. Figure 2. 150 W HID ballast block diagram To generate a square wave current in the lamp, the circuit is driven in the following way: When low-side PMOS Ls is switched ON, the current increase linearly, the voltage across the inductor L is: Equation 1 where: ● VL = inductor voltage ● Vdc = DC bus voltage ● Vlamp = lamp voltage. The duty cycle D is established by a current mode control circuit (see Figure 3). lamp dc L V V V − = |
Similar Part No. - AN3372 |
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Similar Description - AN3372 |
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