Contax SW II - REV 4.01 Manual de usuario descargar pdf (Pagina 18)

R2J20702NP Target Specification

REJ03G1782-0401 Rev.4.01 Page 18 of 27

Jun 17, 2010

The accuracy of Vout can be estimated by using equation (10).

For example, if Vout (typical) = 1.8 V, resistance variation is 1% (i.e. K1, K2 = 1.01 and 0.99),

and VFB = 594 mV to 606 mV:

VFB (typical)

Vout (typical)

= × − 1 × + 1 − 1 × 100 (%) …… (10)

= × − 1 × + 1 − 1 × 100 (%)

Vout (typical)

VFBVout

Vout (typical)

1.8 V

600 mV

1.01

0.99

606 mV

1.8 V

= 2.36%

1.8 V

600 mV

0.99

1.01

594 mV

1.8 V

= −2.31%

Therefore, the output accuracy will be 2.3% under the above conditions.

Figure 5 shows the relationship between the accuracy of the resistance and the accuracy of the output voltage. The

resistor value must have an accuracy of 0.5% if the variation in output voltage from the system is to be kept within two

percent across the voltage range from 0.6 to 3.3 V.

−3

−2

−1

0.51.01.52.02.53.03.5

Vout (typical)

Vout accuracy (%)

R = ±0.5%

R = ±1%

Figure 5 Vout Accuracy vs. Vout Set Voltage

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Contax SW II - REV 4.01 Manual de usuario Pagina 18