參數(shù)資料
型號(hào)： LTC3816EFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO38
封裝： LEAD FREE, PLASTIC, TSSOP-38
文件頁(yè)數(shù)： 18/44頁(yè)
文件大?。?/td> 753K
代理商： LTC3816EFE#PBF
LTC3816
3816f
applicaTions inForMaTion
LC Filter
The external inductor and output capacitor combination
causes a second order LC roll-off at the output with 180°
of phase shift. At higher frequencies, the reactance of the
outputcapacitorapproachesitsESR,andtheroll-offdueto
thecapacitorstops,leaving–20dB/decadeand90°ofphase
shift.BeyondtheESRzero,theceramiccapacitorcreatesa
high frequency pole. The LC filter transfer function, poles
and zero locations are given by the following equations:
A
V
sR
C
s L C
SR C
LC
OUT
SW
ESR
BULK
L OUT
=
≈
+
(
)
1
2
11
1
2
+
=
sR
C
f
L C
ESR
BULK
CER
OUT
LC DOUBLE POLE
L OU
(
_
)
π
TT
ESR ZERO
ESR
BULK
CER POLE
ESR
f
R
C
f
R
C
(
)
(
)
=
1
2
1
2
π
BBULK
CER
OUT
C
where:
RLincludesDCR,senseresistance,PCBtraceresistance
and the turn-on resistance of the power MOSFET.
LL includes the inductor inductance, PCB trace induc-
tance and sense resistor ESL.
COUT = CBULK + CCER
AITC and Differential Amplifiers
With the sense resistor configuration, the AITC and the
differential amplifiers add a double zero and a pole in the
vicinity of the feedback loop crossover frequency, fC, and
multiple poles at higher frequencies. The simplified low
frequencytransferfunctionfromtheregulatoroutputnode
to the SERVO pin, as shown in Figure 14a, is given by the
following equation:
V
sA
s B
sR
C
SERVO
OUT
SR
ESR
BULK
≈
+
1
2
( )
where:
A(SR) = RESR CBULK + AG(SR) RSEN COUT
B(SR) = AG(SR) RSEN RESR CBULK CCER
Similarly, for the DCR configuration with NTC compen-
sation, the simplified low frequency transfer function is
given by:
V
sA
s B
sR
C
SERVO
OUT
DCR
ESR
BULK
≈
+
1
2
(
)
(
)
where:
A(DCR) = RESR CBULK + AG(DCR) RDCR COUT
B(DCR) = AG(DCRN) RDCR RESR CBULK CCER
Note that with either the sense resistor or the DCR current
sense configuration, the AVP circuitry introduces a pole at
the same location as the LC lowpass filter ESR zero. This
cancels the increase in gain and phase caused by the ESR
zero. Fortunately, the zero in the AVP transfer function is
typically within the closed-loop bandwidth and provides a
beneficial phase boost at the crossover frequency.
Error Amplifier
The error amplifier provides most of the low frequency
loop gain and servos the switcher output voltage to the
VID DAC potential minus the AVP droop. After selecting
the inductor, the output capacitor and the AVP component
values, the control loop is compensated by tailoring the
frequencyresponseoftheerroramplifier.AtypicalLTC3816
application uses Type 3 compensation to frequency com-
pensate the feedback loop. Figure 14a and Figure 14b
show the LTC3816 error amplifier Type 3 configuration.
The transfer function of this amplifier is given by the fol-
lowing equation:
V
sR C
C
COMP
SERVO
C
FF
C
=
+
(
) +
(
)
+
(
) +
–
1
ssR
C C
C
1
1
+
The error amplifier component values can be obtained
using the following guidelines.
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