LM3813EVAL National Semiconductor, LM3813EVAL Datasheet - Page 13

• Manufacturer Part Number: LM3813EVAL
• Description: EVALUATION BOARD FOR LM3813
• Manufacturer: National Semiconductor

Specifications of LM3813EVAL

• Main Purpose: Power Management, Current Monitor: Low Side
• Utilized Ic / Part: LM3813
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Other names: *LM3813EVAL

Timing Diagram
Duty cycle of the PWM waveform during any sampling interval indicates the current magnitude (average) and direction during the previous sampling interval.
*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.
Duty Cycle
95.5
92.5
90.0
87.5
85.0
82.5
80.0
77.5
75.0
72.5
70.0
67.5
65.0
62.5
60.0
57.5
55.0
52.5
50.0
(%)
FIGURE 9. Typical Timing Diagram for Mostly Positive Current
TABLE 2. Duty Cycle to Current Conversion Table
Sense Current
(Amps)
0.990
0.935
0.880
0.825
0.770
0.715
0.660
0.605
0.550
0.495
0.440
0.385
0.330
0.275
0.220
0.165
0.110
0.055
0.000
13
Duty Cycle
50.0
47.5
45.0
42.5
40.0
37.5
35.0
32.5
30.0
27.5
25.0
22.5
20.0
17.5
15.0
12.5
10.0
(%)
7.5
5.0
Sense Current
(Amps)
-0.000
-0.055
-0.165
-0.220
-0.275
-0.330
-0.385
-0.440
-0.495
-0.550
-0.605
-0.660
-0.715
-0.770
-0.825
-0.880
-0.935
-0.990
-0.110
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