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LM5122ZPWPR Scheda tecnica(PDF) 31 Page - Texas Instruments

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Il numero della parte LM5122ZPWPR
Spiegazioni elettronici  Wide-Input Synchronous Boost Controller With Multiple Phase Capability
PDF  51 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

LM5122ZPWPR Scheda tecnica(HTML) 31 Page - Texas Instruments

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CS _ DCR
CSP
A
12.5 k
/ (1.25 k
R
)
:
:
IN
DCR
CSN
DCR
L
C
R
R
u
+
VIN
LM5122
CSN
CSP
SW
+
VOUT
HO
LO
LIN
RDCR
RCSN
CDCR
D
Q
QZ
SYNCIN
Master
SYNCIN
Slave1
SYNCIN
Slave3
SYNCIN
Slave2
fSYNC should be always provided
(5VPP)
fSYNC
OPT=VCC
fSYNC
SYNCIN_MASTER
SYNCIN_SLAVE2
OPT=GND
OPT=GND
OPT=GND
SYNCIN_SLAVE1
SYNCIN_SLAVE3
RT
RT
SYNCOUT
SYNCOUT
31
LM5122, LM5122-Q1
www.ti.com
SNVS954G – FEBRUARY 2013 – REVISED MAY 2016
Product Folder Links: LM5122 LM5122-Q1
Submit Documentation Feedback
Copyright © 2013–2016, Texas Instruments Incorporated
Figure 34. 4-Phase Timing Diagram Daisy Chain
8.1.4 DCR Sensing
For the applications requiring lowest cost with minimum conduction loss, Inductor DC resistance (DCR) is used
to sense the inductor current rather than using a sense resistor. Shown in Figure 35 is a DCR sensing
configuration using two DCR sensing resistors and one capacitor.
Figure 35. DCR Sensing
RCSN and CDCR selection should meet Equation 21 since this indirect current sensing method requires a time
constant matching. CDCR is usually selected to be in the range of 0.1 µF to 2.2 µF.
(21)
Smaller value of RCSN minimizes the voltage drop caused by CSN bias current, but increases the dynamic power
dissipation of RCSN. The DC voltage drop of RCSN can be compensated by selecting the same value of RCSP, but
the gain of current amplifier, which is typically 10, is affected by adding RCSP. The gain of current amplifier with
the DCR sensing network can be determined as:
(22)
Due to the reduced accuracy of DCR sensing, FPWM mode operation is recommended when DCR sensing is
used.



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