參數(shù)資料
型號(hào)： LTC3816IUHF#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC38
封裝： 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 17/44頁(yè)
文件大?。?/td> 753K
代理商： LTC3816IUHF#PBF
LTC3816
3816f
applicaTions inForMaTion
resistance (0.39%/°C) and produces a near perfect AVP
slope across temperature.
VOUT=VDAC–AAVP(DCRP)IL=VDAC–AG(DCRP)ILRDCR
where:
A
R
and A
R
AVP DCRP
G DCRP
DCR
G DCRP
VDCRP
LP
(
)
(
)
(
)
=
TTC
VDCRP
DCR
C
L
R
=
IMON
TofacilitateCPUmonitoringofloadcurrentinanIMVP-6.5
application, the LTC3816 forces the IMON pin voltage to
be proportional to the average load current. As shown in
Figure 13, the AITC and the unity-gain amplifiers force
the voltage across the resistor RPREIMON to be equal to
the voltage drop across the sense resistor. A current is
supplied to RIMON that is three times greater than the cur-
rent in RPREIMON. The voltage across the RIMON resistor
is equal to:
V
I R
R
IMON
L
SEN
VSR
AVPSR
IMON
PREIMON
=
(
)
3
To prevent the ground difference between the CPU and
the regulator from affecting the IMON voltage accuracy,
the negative terminal of the resistor RIMON should be
connected directly to the CPU VSS(SEN) pin. Depending
on the output load requirements, the IMON voltage gain
can be programmed by changing the ratio of the RIMON
and RPREIMON resistances. A capacitor should be added
in parallel with the resistor RIMON to remove the switching
ripple. The value of the capacitor CIMON is determined by
the following equation:
C
t
R
IMON
=
where tIMON is the IMON time constant and must be larger
than300s.
In the IMVP-6.5 configuration, the IMON pin potential is
internally clamped to 1.1V with respect to the VSS(SEN) pin
voltage. Forcing the PREIMONpintoINTVCCconfiguresthe
LTC3816 as an IMVP-6 regulator.
FEEDBACK CONTROL
The LTC3816 feedback loop consists of the line feed-
forward circuit, the modulator, the external inductor, the
output capacitor, the AITC and differential amplifier, and
the feedback amplifier with its compensation network. All
of these components affect loop behavior and need to be
accounted for in the loop compensation.
Line Feedforward and Modulator
The modulator consists of the PWM generator, the output
MOSFET drivers and the external MOSFETs themselves.
The modulator gain varies linearly with the input voltage.
Thelinefeedforwardcircuitcompensatesforthischangein
gain and provides a constant gain from the error amplifier
output to the SW node regardless of input voltage. From
a feedback loop point of view, the combination of the line
feedforward circuit and the modulator looks like a linear
voltage transfer function from COMP to the SW node and
has a gain roughly equal to:
AMOD ≈ 25V/V ≈ 28dB
It has a fairly benign AC behavior at typical loop compen-
sation frequencies with significant phase shift appearing
at half the switching frequency.
+
QB
D
L
QT
VIN
ESL
COUT
VOUT
IL
SENSE RESISTOR
RSEN
RAVPSR
TG
BG
BSOURCE
ITC
ITCFB
ISENN
PREIMON
IMON
3816 F13
VSS(SEN)
INTVCC
LTC3816
SW
RVSR
CVSR
RPREIMON
RIMON
CIMON
1X
+
–
AITC
Figure 13. IMON Configuration
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