Rainbow-electronics ATA6625 Manual do Utilizador descarregar pdf (Página 11)

4957E–AUTO–10/07

ATA6623/ATA6625

6. Voltage Regulator

Figure 6-1. V

Voltage Regulator: Ramp Up and Undervoltage

The voltage regulator needs an external capacitor for compensation and to smooth the distur-

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

C > 10 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.

With this special SO8 package (fused lead frame to pin3) an R

thja

of 80 K/W is achieved.

Therefore, it is recommended to connect pin 3 with a wide GND plate on the printed board to get

a good heat sink.

The main power dissipation of the IC is created from the V

output current I

VCC

, which is

needed for the application.

Figure 6-2 shows the safe operating area of the ATA6623/ATA6625.

NRES

5V/3.3V

VCC

5V/3.3V

thun

res_f

Reset

VCC

5.5V/3.8V

12V

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Rainbow-electronics ATA6625 Manual do Utilizador Página 11