MPC5606S datasheet(67/136 Pages) FREESCALE

67 / 136 page

MPC5606S Microcontroller Data Sheet, Rev. 6

Freescale Semiconductor

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

F (minimum)

Place close to NPN collector

Stability capacitance on VDD12

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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