LM3812M-1.0 National Semiconductor, LM3812M-1.0 Datasheet - Page 12

• Manufacturer Part Number: LM3812M-1.0
• Description: Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
• Manufacturer: National Semiconductor

www.national.com
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
*
The sense current should be multiplied by 10 for LM3812-7.0 and LM3813-7.0.
Maximum Sense Current = 1.0 Amps for LM3812-1.0 and LM3813-1.0.
Sense Current
(Amps)
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
*
TABLE 1. Current to Duty Cycle Conversion Table
Duty Cycle
95.5
93.2
90.9
88.6
86.4
84.1
81.8
79.5
77.3
75.0
72.7
70.5
68.2
65.9
63.6
61.4
59.1
56.8
54.5
52.3
50.0
(%)
12
quantization error of
Please see the “PWM Output and Current Accuracy” section
for more details.
Sense Current
(Amps)
-1.00
-0.95
-0.90
-0.85
-0.80
-0.75
-0.70
-0.65
-0.60
-0.55
-0.50
-0.45
-0.40
-0.35
-0.30
-0.25
-0.20
-0.15
-0.10
-0.05
-0.00
*
1
⁄
2
bit is not shown in these tables.
Duty Cycle
11.4
13.6
15.9
18.2
20.5
22.7
25.0
27.3
29.5
31.8
34.1
36.4
38.6
40.9
43.2
45.5
47.7
50.0
(%)
4.5
6.8
9.1