Rainbow-electronics ATA6630 Manual de usuario descargar pdf (Pagina 19)

9117C–AUTO–10/09

ATA6628/ATA6630 [Preliminary]

5.6 Voltage Regulator

The voltage regulator needs an external capacitor for compensation and for smoothing the dis-

turbances from the microcontroller. It is recommended to use an electrolythic capacitor with

C > 1.8 µF and a ceramic capacitor with C = 100 nF. The values of these capacitors can be var-

ied by the customer, depending on the application.

The main power dissipation of the IC is created from the VCC output current I

VCC

, which is

needed for the application. In Figure 5-2 on page 19 the safe operating area of the

ATA6628/ATA6630 is shown.

Figure 5-1. VCC Voltage Regulator: Ramp-up and Undervoltage Detection

Figure 5-2. Power Dissipation: Safe Operating Area versus VCC Output Current and Supply

Voltage V

at Different Ambient Temperatures Due to R

thja

= 35 K/W

For microcontroller programming, it may be necessary to supply the VCC output via an external

power supply while the V

Pin of the system basis chip is disconnected. This behavior is no

problem for the system basis chip.

NRES

5V/3.3V

thun

res_f

Reset

VCC

5.5V/3.8V

12V

VCC

3 0

3 5791113 15 17 19

VCC

/mA

amb

= 125°C

amb

= 105°C

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 33 34

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Rainbow-electronics ATA6630 Manual de usuario Pagina 19