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参数资料
| 型号： | IR3009 |
| 厂商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龙，速龙，或控制IC的VR10.X |
| 文件页数： | 24/39页 |
| 文件大小： | 693K |
| 代理商： | IR3009 |
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IR3093
Page 24 of 39
07/15/04
O
MIN
CS
MAX
n
L
FB
DRP
R
G
R
R
R
_
_
(13)
Lossless Average Inductor Current Sensing
Inductor current can be sensed by connecting a series resistor and a capacitor network in parallel with the inductor
and measuring the voltage across the capacitor. The equation of the sensing network is,
1
)
(
)
(
S
S
L
L
S
S
L
C
C
sR
sL
R
s
i
C
sR
s
v
s
v
1
)
(
1
Usually the resistor Rcs and capacitor Ccs are chosen so that the time constant of Rcs and Ccs equals the time
constant of the inductor which is the inductance L over the inductor DCR. If the two time constants match, the
voltage across Ccs is proportional to the current through L, and the sense circuit can be treated as if only a sense
resistor with the value of R
L
was used. The mismatch of the time constants does not affect the measurement of
inductor DC current, but affects the AC component of the inductor current.
The advantage of sensing the inductor current versus high side or low side sensing is that actual output current
being delivered to the load is obtained rather than peak or sampled information about the switch currents. The
output voltage can be positioned to meet a load line based on real time information. Except for a sense resistor in
series with the inductor, this is the only sense method that can support a single cycle transient response. Other
methods provide no information during either load increase (low side sensing) or load decrease (high side sensing).
An additional problem associated with peak or valley current mode control for voltage positioning is that they suffer
from peak-to-average errors. These errors will show in many ways but one example is the effect of frequency
variation. If the frequency of a particular unit is 10% low, the peak to peak inductor current will be 10% larger and
the output impedance of the converter will drop by about 10%. Variations in inductance, current sense amplifier
bandwidth, PWM prop delay, any added slope compensation, input voltage, and output voltage are all additional
sources of peak-to-average errors.
Measure the inductance L and the inductor DC resistance R
L
. Pre-select the capacitor C
CS
and calculate R
CSX
as
follows.
R
L
R
CS
L
CSX
C
(14)
Inductor DCR Temperature Correction
If the Current Sense Amplifier temperature dependent gain is not adequate to compensate the inductor DCR TC, a
negative temperature coefficient (NTC) thermistor can be added. The thermistor should be placed close to the
inductor and connected in parallel with the feedback resistor, as shown in Figure 9. The resistor in series with the
thermistor is used to reduce the nonlinearity of the thermistor.
相关PDF资料 |
PDF描述 |
|---|---|
| IR3093M | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| IR3093MTR | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| IR3080 | XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
| IR3080MTR | XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR301 | 制造商:Extech 功能描述:IR Plus Stem Thermometer 制造商:Extech 功能描述:IR + STEM THERMOMETER |
| IR3020-02BG | 制造商:SMC Corporation of America 功能描述:Precision Regulator+Gauge, Bracket,R1/4 |
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| IR3020-F04 | 制造商:SMC 功能描述:Precision Regulator 1/2, 0.01 to 0.8MPa |
| IR3080 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
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