Rainbow-electronics LM3813 Uživatelský manuál stáhnout pdf (Strana 12)

Look-Up Tables

The following tables show how to convert the duty cycle of

the PWM output to a current value, and vice versa. The

quantization error of

⁄

bit is not shown in these tables.

Please see the “PWM Output and Current Accuracy” section

for more details.

TABLE 1. Current to Duty Cycle Conversion Table

Sense Current

(Amps)*

Duty Cycle

(%)

Sense Current

(Amps)*

Duty Cycle

(%)

1.00 95.5 -1.00 4.5

0.95 93.2 -0.95 6.8

0.90 90.9 -0.90 9.1

0.85 88.6 -0.85 11.4

0.80 86.4 -0.80 13.6

0.75 84.1 -0.75 15.9

0.70 81.8 -0.70 18.2

0.65 79.5 -0.65 20.5

0.60 77.3 -0.60 22.7

0.55 75.0 -0.55 25.0

0.50 72.7 -0.50 27.3

0.45 70.5 -0.45 29.5

0.40 68.2 -0.40 31.8

0.35 65.9 -0.35 34.1

0.30 63.6 -0.30 36.4

0.25 61.4 -0.25 38.6

0.20 59.1 -0.20 40.9

0.15 56.8 -0.15 43.2

0.10 54.5 -0.10 45.5

0.05 52.3 -0.05 47.7

0.00 50.0 -0.00 50.0

*Maximum Sense Current = 1.0 Amps for LM3812-1.0 and LM3813-1.0.

The sense current should be multiplied by 10 for LM3812-7.0 and LM3813-7.0.

LM3812/LM3813

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Rainbow-electronics LM3813 Uživatelský manuál Strana 12