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LM1086-MIL

SNVSAX4 – JUNE 2017

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7.3 Feature Description

7.3.1 Ripple Rejection

Ripple rejection is a function of the open loop gain within the feedback loop (refer to Figure 13 and Figure 16).

decreases ripple rejection by a factor of four (

−12 dB); output ripple increases as adjustment voltage increases.

However, the adjustable version allows this degradation of ripple rejection to be compensated. The adjust

than R1 at the desired ripple frequency. This bypass capacitor prevents ripple from being amplified as the output

voltage is increased.

(1)

7.3.2 Load Regulation

The LM1086-MIL regulates the voltage that appears between its output and ground pins, or between its output

and adjust pins. In some cases, line resistances can introduce errors to the voltage across the load. To obtain

the best load regulation, a few precautions are needed.

directly to the output terminal on the positive side and directly tied to the ground terminal on the negative side.

Figure 14. Typical Application Using Fixed Output Regulator

When the adjustable regulator is used (Figure 15), the best performance is obtained with the positive side of the

resistor R1 tied directly to the output terminal of the regulator rather than near the load. This eliminates line drops

from appearing effectively in series with the reference and degrading regulation. For example, a 5-V regulator

with 0.05-

If R1 (= 125

Ω) is connected near the load the effective line resistance will be 0.05 Ω (1 + R2 / R1) or in this

case, it is 4 times worse. In addition, the ground side of the resistor R2 can be returned near the ground of the

load to provide remote ground sensing and improve load regulation.

Figure 15. Best Load Regulation Using Adjustable Output Regulator