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LTC3854EMSE 数据表(PDF) 11 Page - Linear Technology

部件名 LTC3854EMSE
功能描述  Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller
Download  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3854EMSE 数据表(HTML) 11 Page - Linear Technology

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LTC3854

3854fa
applicaTions inForMaTion
Figure 2. Buck Regulator Using DCR Current Sense
capacitor is equal to the voltage drop across the inductor
DCR • R2/(R1+R2). R2 may be used to scale the voltage
across the same terminals when the DCR is greater than
the target sense resistance. Check the manufacturer’s
datasheetforspecificationsregardingtheinductorDCR,in
ordertoproperlydimensiontheexternalfiltercomponents.
The DCR of the inductor can also be measured using a
precision RLC meter.
Slope Compensation and Inductor Peak Current
Slope compensation provides stability in constant-fre-
quency architectures by preventing subharmonic oscil-
lations at high duty cycles. It is accomplished internally
by adding a compensating ramp to the inductor current
signal. Normally, this results in a reduction of maximum
inductor peak current for high duty cycles. However, the
LTC3854 uses a novel scheme that allows the maximum
inductor peak current to remain unaffected throughout
all duty cycles.
3854 F02
LTC3854
VIN
RUN/SS
TG
BOOST
SW
BG
GND
INTVCC
ITH
FB
SENSE
SENSE+
M1
M2
CB
DBOOST
CIN
CVINT
CC2
CC
RC
CSS
RFB1
L
DCR
R1
COUT
C1
VOUT
RFB2
VIN
R2
INDUCTOR
Inductor Value Calculation
The inductor value has a direct effect on ripple current.
The inductor ripple current
∆IL decreases with higher
inductance or frequency and increases with higher VIN.
LMIN =
1
∆IL • fSW
• VOUT 1−
VOUT
VIN(MAX)
Accepting larger values of
∆IL allows the use of low value
inductors, but results in a higher output voltage ripple
and greater core losses. A reasonable starting point for
setting ripple current is IL = 0.4 • (IMAX). The maximum
∆IL occurs at the maximum input voltage.
Option 1: DCR within desired range
R1• C1
=
L
DCR
(R2 not used)
Option 2: DCR > desired RSENSE
R1||R2 • C1 =
L
DCR
(at 20°C)
RSENSE (EQ) = DCR(MAX)•
R2
R1
+R2


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