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LM2435T Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM2435T Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 10 page Application Hints (Continued) board. Note that the heatsink is attached (soldered) to PCB ground just to the left and just to the right of the device. The LM2435 is attached to the heatsink using a screw, star washer and nut. The star washer should be located on the side of the heatsink opposite the device. NSC DEMONSTRATION BOARD Figure 11 shows routing and component placement on the NSC LM1279/243X demonstration board. The schematic of the board is shown in Figure 10. This board provides a good example of a layout that can be used as a guide for future layouts. Note the location of the following components: • C54, C56 — V CC bypass capacitor, located very close to pin 4 and ground connections to the device. • C43, C44 — V BB bypass capacitors, located close to pin 8 and ground. • C53, C55 — V CC bypass capacitors, near LM2435 and V CC clamp diodes. This is very important for arc protec- tion. The routing of the LM2435 outputs to the CRT is very critical to achieving optimum performance. Figure 12 shows the routing and component placement from pin 1 of the LM2435 to the red cathode. Note that the components are placed so that they almost line up from the output pin of the LM2435 to the red cathode pin of the CRT connector. This is done to minimize the length of the video path between these two components. Note also that the arc protection diodes, D16 and D17 are placed close to L1 and C14 in order to minimize the size of the node connecting all these components. R21 and D9 are placed close to C14 and R32 for the same rea- son. This minimizes parasitic capacitance in the video path and also enhances the effectiveness of the protection di- odes. The anode of protection diode D16 is connected di- rectly to a section of the ground plane that has a short and direct path to the LM2435 ground. The cathode of D16 is connected to V CC very close to decoupling capacitor C53 (see Figure 12) which is connected to the same section of the ground plane as D17. The diode placement and routing is very important for minimizing the voltage stress on the LM2435 during an arc over event. Lastly, notice that S1 is placed very close to the red cathode and is tied directly to CRT ground. www.national.com 6 |
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