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MPC5606S Datasheet(PDF) 67 Page - Freescale Semiconductor, Inc |
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MPC5606S Datasheet(HTML) 67 Page - Freescale Semiconductor, Inc |
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67 / 136 page ![]() MPC5606S Microcontroller Data Sheet, Rev. 6 Freescale Semiconductor 67 Figure 7. External NPN ballast connections The capacitor values listed in Table 22 include a de-rating factor of 40%, covering tolerance, temperature, and aging effects. These factors are taken into account to assure proper operation under worst-case conditions. X7R type materials are recommended for all capacitors, based on ESR characteristics. Large capacitors are for regulator stability and should be located near the external ballast transistor. The number of capacitors is not important — only the overall capacitance value and the overall ESR value are important. Small capacitors are for power supply decoupling, although they do contribute to the overall capacitance values. They should be located close to the device pin. Table 21. Allowed ballast components Part Manufacturer Recommended derivative BCP68 ON, IFX, NXP, Fairchild, ST, etc. BCP68 BCX68 IFX BCX68-10 BCX68-16 BC817 ON, IFX, NXP, Fairchild, etc. BC817Su BC817-25 BCP56 ON, IFX, NXP, Fairchild, ST, etc. BCP68-10 BCP68-16 Table 22. Ballast component parameters Parameter Specification Capacitance on VDDR 10 F (minimum) Place close to NPN collector Stability capacitance on VDD12 40 F (minimum) Place close to NPN emitter Decoupling capacitance on VDD12 100 nF number of pins (minimum) Place on each VDD12/VSS12 pair and on the PLL supply/ground pair Base resistor 20 k VRC_CTRL VDDR VDD12 20 k |
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