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參數(shù)資料
| 型號： | LTC3867IUF#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件頁數(shù)： | 7/36頁 |
| 文件大?。?/td> | 380K |
| 代理商： | LTC3867IUF#PBF |
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LTC3867
15
3867f
APPLICATIONS INFORMATION
the sense resistor represented a relatively small error. For
today’s highest current density solutions, however, the
value of the sense resistor can be less than 1mΩ and the
peak sense voltage can be as low as 20mV. In addition,
inductor ripple currents greater than 50% with operation
up to 1MHz are becoming more common. Under these
conditions the voltage drop across the sense resistor’s
parasitic inductance is no longer negligible.
In previous generations of controllers, a small RC filter
placed near the IC was commonly used to reduce the ef-
fectsofcapacitiveandinductivenoisecoupledinthesense
traces on the PCB. A typical filter consists of two series
10Ω resistors connected to a parallel 1000pF capacitor,
resulting in a time constant of 20ns. This same RC filter,
with minor modifications, can be used to extract the resis-
tive component of the current sense signal in the presence
of parasitic inductance. For example, Figure 4 illustrates
the voltage waveform across a 2mΩ sense resistor with
a 2010 footprint for a 1.2V/15A converter operating at
100% load. The waveform is the superposition of a purely
resistive component and a purely inductive component.
It was measured using two scope probes and waveform
math to obtain a differential measurement. Based on
additional measurements of the inductor ripple current
and the on-time and off-time of the top switch, the value
(3a) Using a Resistor to Sense Current
Figure 3. Two Different Methods of Sensing Current
(3b) Using the Inductor DCR to Sense Current
VIN
INTVCC
BOOST
TG
SW
BG
PGND
FILTER COMPONENTS
PLACED NEAR SENSE PINS
SENSE+
SENSE–
SGND
LTC3867
VOUT
3867 F03a
CF 2 RF ≤ ESL/RS
POLE-ZERO
CANCELLATION
SENSE RESISTOR
PLUS PARASITIC
INDUCTANCE
RS
ESL
CF
RF
VIN
INTVCC
BOOST
TG
SW
BG
PGND
ITEMP
RNTC
*PLACE C1 NEAR SENSE+,
SENSE– PINS
**PLACE R1 NEXT TO INDUCTOR
INDUCTOR
OPTIONAL
TEMP COMP
NETWORK
DCR
L
SENSE+
SENSE–
SGND
LTC3867
VOUT
3867 F03b
R1**
R2
C1*
RP
RS
R1||R2 × C1 =
L
DCR
RSENSE(EQ) = DCR
R2
R1 + R2
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