Cirrus-logic AN374 Manual do Utilizador descarregar pdf (Página 26)

AN374

26 AN374REV2

If resistance is measured, then

The data below shows the white/blue currents across the dim. The format in Figure 18 is useful because it is

required when the data is imported into the curve fitter.

The blue/white current at 100% will be considered the nominal current at full sine wave. The reference currents

are set based on this value.

The red currents and the corresponding temperature data are shown below.

The target currents will be the currents at 100% dim and 25

C ambient temperature. The NTC code data in

Figure 19 shows the computed NTC resistance according to Equation 22. The NTC code is the internal

computed value used by the CS1630/31.

NTC

4M

NTC

Series

--------------------------------------

[Eq. 23]

enter enter

љљ

BwDim I_bw (A)

0.1 0.068

0.2 0.131

0.3 0.190

0.4 0.246

0.5 0.297

0.6 0.344

0.7 0.386

0.8 0.425

0.9 0.460

10.490

Enter dim values

in ascending order

At 50% dim,

White

= 0.297 A

Figure 18. Example of Formatted Data for the White/Blue Current Across Dim

ї enter 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Tamb(room)

computedќ

5.00 0.042 0.078 0.110 0.138 0.161 0.180 0.196 0.207 0.216 0.221

15.00 0.044 0.083 0.116 0.145 0.170 0.190 0.206 0.218 0.227 0.233

25.00 0.046 0.087 0.122 0.153 0.179 0.200 0.217 0.230 0.239 0.245

45.00 0.049 0.091 0.128 0.160 0.187 0.210 0.228 0.241 0.251 0.257

65.00 0.051 0.096 0.135 0.168 0.197 0.220 0.239 0.253 0.264 0.270

85.00 0.053 0.101 0.142 0.177 0.207 0.231 0.251 0.266 0.277 0.284

Tamb(room) enter ќ

5.00 5.20 7.40 9.60 11.80 14.00 16.20 18.40 20.60 22.80 25.00

15.00 15.20 17.40 19.60 21.80 24.00 26.20 28.40 30.60 32.80 35.00

25.00 25.20 27.40 29.60 31.80 34.00 36.20 38.40 40.60 42.80 45.00

45.00 45.20 47.40 49.60 51.80 54.00 56.20 58.40 60.60 62.80 65.00

65.00 65.20 67.40 69.60 71.80 74.00 76.20 78.40 80.60 82.80 85.00

85.00 85.20 87.40 89.60 91.80 94.00 96.20 98.40 100.60 102.80 105.00

computedќ

13.5 15.2 17.0 19.0 21.2 23.6 26.1 28.9 31.9 35.1

22.5 25.0 27.6 30.5 33.6 36.9 40.5 44.2 48.2 52.4

35.4 38.8 42.5 46.3 50.4 54.7 59.2 64.0 68.9 73.9

74.4 79.7 85.1 90.6 96.2 102.0 107.7 113.6 119.5 125.3

125.9 131.7 137.5 143.3 149.0 154.6 160.0 165.4 170.7 175.8

176.2 181.1 185.9 190.6 195.0 199.3 203.4 207.4 211.2 214.8

RedDim

Tntc[C]

NTC code

I_red

At 30% dim,

Red

= 0.122 A and

NTC

= 29.60°C

Enter dim values in ascending order

Enter

temperature

values in

ascending

order

Figure 19. Example of Formatted Data for Red Current and NTC Resistance/Code Across Dim

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 34 35

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