Rainbow-electronics LM3813 Bedienungsanleitung PDF herunterladen (Seite 13)

TABLE 2. Duty Cycle to Current Conversion Table

Duty Cycle

(%)

Sense Current

(Amps)

Duty Cycle

(%)

Sense Current

(Amps)

95.5 0.990 50.0 -0.000

92.5 0.935 47.5 -0.055

90.0 0.880 45.0 -0.110

87.5 0.825 42.5 -0.165

85.0 0.770 40.0 -0.220

82.5 0.715 37.5 -0.275

80.0 0.660 35.0 -0.330

77.5 0.605 32.5 -0.385

75.0 0.550 30.0 -0.440

72.5 0.495 27.5 -0.495

70.0 0.440 25.0 -0.550

67.5 0.385 22.5 -0.605

65.0 0.330 20.0 -0.660

62.5 0.275 17.5 -0.715

60.0 0.220 15.0 -0.770

57.5 0.165 12.5 -0.825

55.0 0.110 10.0 -0.880

52.5 0.055 7.5 -0.935

50.0 0.000 5.0 -0.990

*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.

Timing Diagram

10012211

Duty cycle of the PWM waveform during any sampling interval indicates the current magnitude (average) and direction during the previous sampling interval.

FIGURE 9. Typical Timing Diagram for Mostly Positive Current

LM3812/LM3813

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