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| 型号： | AN-1192 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | broad portfolio of monolithic power integrated circuits covering power levels |
| 中文描述： | 丰富的产品组合覆盖功率级别单片功率集成电路 |
| 文件页数： | 11/21页 |
| 文件大小： | 548K |
| 代理商： | AN-1192 |
7.0 BPA200–200W Bridged/Parallel
Circuit
(Continued)
7.1.4 Electrical Design Notes
The following electrical design notes will aid in obtaining a
high performance amplifier solution.
Input resistor values should be equal and have a 0.1%
tolerance to minimize amplifier noise. These resistor
pairs are R
& R
, R
b2
& R
i2
, R
i3
& R
c3
, and R
i4
& R
d3
as
shown in Figure 13.
0.1% tolerance resistors for close gain matching should
be used to minimize offset voltages when not using servo
circuits.
1% tolerance high wattage ballast resistors are required
when paralleling outputs to keep differently biased out-
puts from fighting each other. The wattage rating is de-
pendent upon the amount of current expected to flow
from each output and the resistance of the ballast resis-
tor; P = I
2
R. A good resistance value is 0.1
. Amplifier
efficiency is lost if the resistor value is too large like 1
since 10A times 1
is 10V of output voltage drop.
Low output offset voltage servo op amp is required to
minimize solution output offset voltage.
An input buffer is required because of the low input
impedance from paralleling of the inputs. High valued
gain setting resistors could be used at the risk of increas-
ing noise susceptibility. The proposed solution with an
input buffer (see Figures 13 & 17) provides the easiest
way around gain resistor matching and providing a high
input impedance.
A
www.national.com
11
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