参数资料
型号: LTC3829EFE#PBF
厂商: Linear Technology
文件页数: 15/40页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 38TSSOP
标准包装: 50
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 850kHz
占空比: 94%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 管件
LTC3829
APPLICATIONS INFORMATION
V IN
INTV CC
BOOST
TG
V IN
SENSE RESISTOR
PLUS PARASITIC
INDUCTANCE
LTC3829
SW
R S
ESL
V OUT
BG
PGND
SENSE +
SENSE –
SGND
C F
R F
R F
C F ? 2 ? R F ≤ ESL/R S
POLE-ZERO
CANCELLATION
FILTER COMPONENTS
PLACED NEAR SENSE PINS
(2a) Using a Resistor to Sense Current
V IN
INTV CC
3829 F02a
V IN
OPTIONAL
TEMP COMP
NETWORK
BOOST
TG
SW
LTC3829
INDUCTOR
L DCR
V OUT
R S
ITEMP
BG
PGND
SENSE +
R1**
R NTC
R P
SENSE –
SGND
C1*
R2
*PLACE C1 NEAR SENSE + , R1||R2 × C1 =
SENSE – PINS
**PLACE R1 NEXT TO INDUCTOR
L
DCR
R SENSE(EQ) = DCR
R2
R1 + R2
3829 F02b
(2b) Using the Inductor DCR to Sense Current
Figure 2. Two Different Methods of Sensing Current
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. A
typical sensing circuit using a discrete resistor is shown in
Figure 2a. In previous generations of controllers, a small
RC filter placed near the IC was commonly used to reduce
the effects of capacitive and inductive noise coupled in
the sense 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 resistive component of the current sense signal in the
presence of parasitic inductance. For example, Figure 3
illustrates the voltage waveform across a 2mΩ sense
resistor with a 2010 footprint for the 1.2V/15A converter
operating at 100% load. The waveform is the superposi-
tion 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
3829fa
For more information www.linear.com/LTC3829
15
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