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参数资料
| 型号： | IR3092MTR |
| 厂商： | International Rectifier |
| 英文描述： | 2 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 2相皓龙，速龙，或控制IC的VR10.X |
| 文件页数： | 22/37页 |
| 文件大小： | 619K |
| 代理商： | IR3092MTR |
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IR3092
Page 22 of 37
06/25/04
A resistor R
FB
between FB pin and the converter output is used to create output voltage offset V
O_NLOFST
which is the
difference between V
DAC
voltage and output voltage at no load condition. An internal current source whose value is
programmed by the same external resistor that programs the oscillator frequency, R
ROSC
, pumps current I
ROSC
out of the
FB pin.
The voltage at the VDRP pin is an average of both phase Current Sense Amplifiers and represents the sum of the VDAC
voltage and the average inductor current of all the phases. The VDRP pin is connected to the FB pin through the Adaptive
Voltage Positioning Resistor R
DRP.
Adaptive voltage positioning lowers the converter voltage by R
O
*I
O,
where R
O
is the
required
output impedance of the converter. R
FB
and R
DRP
are determined by (9) and (10) respectively, where R
O
is the
required
output impedance of the converter.
V
R
ROSC
NLOFST
O
FB
I
_
(9)
O
L
R
FB
DRP
R
R
R
2
5
23
(10)
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.
The DC resistance of the inductor is utilized to sense the inductor current. Usually the resistor R
CS
and capacitor C
CS
in
parallel with the inductor are chosen to match the time constant of the inductor, and therefore the voltage across the
capacitor C
CS
represents the inductor current. If the two time constants are not the same, the AC component of the
capacitor voltage is different from that of the real inductor current. The time constant mismatch does not affect the
average current sharing among the multiple phases, but affects the AC component of the inductor current as well as the
output voltage during the load current transient if adaptive voltage positioning is adopted.
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| IR3092MTRPBF | 功能描述:IC CONTROLLER 2PHASE 48-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| IR3093M | 制造商:IRF 制造商全称:International Rectifier 功能描述:3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| IR3093MPBF | 功能描述:IC VID VOLTAGE PROGRAMMER 48MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| IR3093MTR | 制造商:IRF 制造商全称:International Rectifier 功能描述:3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| IR3093MTRPBF | 功能描述:IC CTLR 3PHASE VR10 48-MLQP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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