LM5116
SNVS499G –FEBRUARY 2007–REVISED MARCH 2013
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For VSL without RRAMP, use IOS = 25 µA
For VSL with RRAMP to VCC, use IOS = 25 µA + VCC/RRAMP
For VSL with RRAMP to -VCC, use IOS = 25 µA - VCC/RRAMP
ERROR AMPLIFIER TRANSFER FUNCTION
The following equations are used to calculate the error amplifier transfer function:
1
VCOMP
-GEA(S) x
=
GEA(S)
KFB
VOUT(FB)
1
s
1 +
1 +
+
x
AOL
wBW
(47)
(48)
s
wZEA
1 +
RFB1
KFB
=
GEA(S)
=
RFB1 + RFB2
s
wHF
s
wO
1 +
x
1
1
wO =
wZEA
=
CCOMP x RCOMP
(CHF + CCOMP) x RFB2
(CHF + CCOMP
)
wHF
=
CHF x CCOMP x RCOMP
(49)
Where AOL = 10,000 (80 dB) and ωBW = 2π x fBW. GEA(S) is the ideal error amplifier gain, which is modified at DC
and high frequency by the open loop gain of the amplifier and the feedback divider ratio.
28
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