HW Description
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SLVUAS6A – March 2017 – Revised January 2018
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LP2951EVM
2.4
Bypass Capacitor
Capacitor C
8
is meant to give additional stability to the internal amplifier of the LP2951 device by placing
additional capacitance between the Output and the Feedback pins. Stray capacitance to the LP2951
Feedback pin can cause instability. This may especially be a problem when using high value external
resistors to set the output voltage. To fix this problem, populate C
8
with a 100-pF capacitor and increase
the output capacitor to at least 3.3 µF. See the
LP2951
and
LP2951-N
data sheets for more information
regarding the Cbypass.
Figure 4. Location for Bypass Capacitor C
8
2.5
Fixed Output Voltage Resistors
Resistors R
1
and R
2
are 0-
Ω
resistors that keep the output in the fixed output voltage mode when
populated. R
1
connects the Feedback pin to the V
TAP
pin, while R
2
connects the Sense pin and the Output
pin.
Figure 5. R
1
and R
2
Used to Set Fixed Voltage Mode on EVM
