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EL5170 Datasheet(PDF) 10 Page - Intersil Corporation |
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EL5170 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 14 page 10 FN7309.8 September 14, 2010 By setting the two PDMAX equations equal to each other, we can solve the output current and RLOAD to avoid the device overheat. Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, a good printed circuit board layout is necessary for optimum performance. Lead lengths should be as sort as possible. The power supply pin must be well bypassed to reduce the risk of oscillation. For normal single supply operation, where the VS- pin is connected to the ground plane, a single 4.7µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor from VS+ to GND will suffice. This same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. In this case, the VS- pin becomes the negative supply rail. For good AC performance, parasitic capacitance should be kept to minimum. Use of wire wound resistors should be avoided because of their additional series inductance. Use of sockets should also be avoided if possible. Sockets add parasitic inductance and capacitance that can result in compromised performance. Minimizing parasitic capacitance at the amplifier’s inverting input pin is very important. The feedback resistor should be placed very close to the inverting input pin. Strip line design techniques are recommended for the signal traces. Typical Applications 0 Ω VFB VINB VREF EL5172/ EL5372 EL5170/ EL5370 VOUT 50 50 ZO = 100Ω VIN 50 Ω 50 Ω FIGURE 20. TWISTED PAIR DRIVER IN+ IN- FIGURE 21. DUAL COAXIAL CABLE DRIVER IN- 0 Ω VFB VINB VREF VOUT VIN EL5172/EL5372 + VIN VREF VIN 50 Ω 50 Ω VOUTB EL5170/EL5370 - 50 Ω COAX 50 Ω COAX 50 Ω 50 Ω VOUT IN+ EL5170, EL5370 |
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