參數(shù)資料
型號(hào)： LTC3856IUH#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC38
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD-X, QFN-32
文件頁(yè)數(shù)： 18/40頁(yè)
文件大?。?/td> 2222K
代理商： LTC3856IUH#TRPBF
LTC3856
3856f
applicaTions inForMaTion
error amplifier. The amplifier has an output swing range
of 0V to 3.6V. The output uses an NPN emitter follower
with 80k feedback resistance.
Active Voltage Positioning (AVP)
In an application, the AVP scheme modifies the regulated
output voltage depending on its current loading. AVP
can improve overall transient response and save power
consumption.
TheLTC3856sensesinductorcurrentinformationbymoni-
toring voltage drops across the sense resistors RSENSE or
the DCR sensing network of the two channels. The voltage
dropsareaddedtogetherandappliedasVPRE-AVPbetween
the AVP and DIFFP pins, which are connected through
resistor RPRE-AVP. Then VPRE-AVP is scaled through RAVP
and added to output voltage as the compensation for the
load voltage drop.
Let:
V = VSENSE1+ – VSENSE1–
V = VSENSE2+ – VSENSE2–
then:
V
R
DIFFP VOUT
AVP
,
=
2
PRE-AVP
The final load slope is defined by the inductor current
sense resistors and the two external resistors previously
mentioned.
In summary, the load slope is:
R
V A
SENSE
AVP
/
PRE-AVP
The recommended value for RAVP is 90Ω to 100Ω. The
maximum output voltage at AVP is 2.5V. Therefore, for
outputshigherthan2.5V,theAVPfunctionisnotsupported.
TheDIFFPpin,however,shouldalwaysbeconnectedtothe
output even when AVP or diffamp functions are not used.
Programmable Stage Shedding Mode
When the MODE pin is tied to INTVCC, the LTC3856 en-
ters Stage Shedding mode. This means that the second
channel will stop switching when ITH is below a certain
programmed threshold. This threshold voltage on ITH is
programmed according to the following formula:
V
SHED
ISET
=
+
(
)
0 5
5
3
0 5
.
.
The valid range of VISET is between 0V to 0.5V, where VISET
is the voltage on the ISET pin. There is a precision 7.5A
flowing out of the ISET pin. Connecting a resistor to SGND
sets the VISETvoltage.Whenleftfloating,VISETvoltagewill
be at INTVCC. The Stage Shedding mode threshold voltage
in this case will be 0.5V. There is a 50mV hysteresis for
the Stage Shedding mode threshold comparator.
Programmable Burst Mode Operation
When the MODE pin is floating, the LTC3856 enters Burst
Mode operation. This means that both channels will stop
switching when ITH is below a certain threshold.
The Burst Mode clamp, which sets the current limit when
bursting, can be programmed through VISET according to
the following formula:
VCLAMP = 0.7 + 0.62 (0.5 – VISET)
The valid range of VISET is between 0.3V to 0.5V and
VISET is the voltage on the ISET pin. There is a precision
7.5A flowing out of ISET. Connecting a resistor to SGND
sets the VISET voltage. When left floating, VISET will be at
INTVCC. The Burst Mode clamp voltage in this case will
be 0.7V. There is a 50mV hysteresis for the Burst Mode
comparator.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
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