參數(shù)資料
型號(hào)： LTC3833IUDC#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 5/36頁(yè)
文件大?。?/td> 513K
代理商： LTC3833IUDC#PBF
LTC3833
13
3833f
APPLICATIONS INFORMATION
The Typical Application on the first page of this data sheet
is a basic LTC3833 application circuit. The LTC3833 can be
configured to sense the inductor current either through a
seriessenseresistor,RSENSE,orthroughanRCfilteracross
the inductor (DCR). The choice between the two current
sensing schemes is largely a design trade-off between
cost, power consumption and accuracy. DCR sensing
is becoming popular because it saves expensive current
sensing resistors and is more power efficient, especially
in high current applications. However, current sensing
resistors provide the most accurate current limits for the
controller. Once the required output voltage and operat-
ing frequency have been determined, external component
selection is driven by load requirements, and begins with
theselectionofinductorandcurrentsensingcomponents.
Next, the power MOSFETs are selected. Finally, input and
output capacitors are selected.
Output Voltage Programming and
Differential Output Sensing
The LTC3833 integrates differential output sensing with
output voltage programming, allowing for simple and
seamless design. As shown in Figure 1, the output voltage
is programmed by an external resistor divider from the
regulated output point to its ground reference. The resis-
tive divider is tapped by the VOSNS+ pin, and the ground
reference is sensed by VOSNS–. An optional feed-forward
capacitor, CFF, can be used to improve the transient
performance of the regulator system as discussed under
OPTI-LOOP Compensation. The resulting output voltage
is given according to the following equation:
VOUT = 0.6V 1+
RFB2
RFB1
Moreprecisely,theVOUTvalueprogrammedintheprevious
equation is with respect to the output’s ground reference,
and thus is a differential quantity. For example, if VOUT is
programmed to 5V and the output ground reference is at
–0.5V, then the output will be 4.5V with respect to signal
ground. The minimum differential output voltage is limited
totheinternalreference,0.6V,andthemaximumdifferential
output voltage is 5.5V.
The VOSNS+ pin is high impedance with no input bias cur-
rent. The VOSNS– pin has about 35μA of current flowing
out of the pin.
Differentialoutputsensingallowsformoreaccurateoutput
regulation in high power distributed systems having large
line losses. Figure 2 illustrates the potential variations in
the power and ground lines due to parasitic elements.
These variations are exacerbated in multi-application
systems with shared ground planes. Without differential
output sensing, these variations directly reflect as an error
in the regulated output voltage. The LTC3833’s differential
output sensing can correct for up to ±500mV of variation
in the output’s power and ground lines.
The LTC3833’s differential output sensing scheme is
distinct from conventional schemes where the regulated
output and its ground reference are directly sensed with
a difference amplifier whose output is then divided down
with an external resistive divider and fed into the error
amplifier input. This conventional scheme is limited by
the common mode input range of the difference amplifier
and typically limits differential sensing to the lower range
of output voltages.
The LTC3833 allows for seamless differential output
sensing by sensing the resistively divided feedback volt-
age differentially. This allows for differential sensing in
the full output range from 0.6V to 5.5V. The difference
amplifier of the LTC3833 has a –3dB bandwidth of 8MHz,
high enough to not affect main loop compensation and
transient behavior.
To avoid noise coupling into VOSNS+, the resistor divider
should be placed near the VOSNS+ and VOSNS– pins and
physically close to the LTC3833. The remote output and
ground traces should be routed together as a differential
pair to the remote output. These traces should be termi-
nated as close as physically possible to the remote output
RFB2
VOSNS+
LTC3833
VOSNS–
COUT
CFF
(OPT)
3833 F01
VOUT
RFB1
Figure 1. Setting Output Voltage
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