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參數(shù)資料
| 型號： | IR3092 |
| 廠商： | International Rectifier |
| 英文描述： | 2 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 2相皓龍，速龍，或控制IC的VR10.X |
| 文件頁數(shù)： | 23/37頁 |
| 文件大?。?/td> | 619K |
| 代理商： | IR3092 |
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IR3092
Page 23 of 37
06/25/04
Measure the inductance L and the inductor DC resistance R
L
. Pre-select the capacitor C
CS
and calculate R
CS
as follows.
R
L
R
CS
L
CS
C
(11)
The bias current flowing out of the non-inverting input of the current sense amplifier creates a voltage drop across R
CS,
which is equivalent to an input offset voltage of the current sense amplifier. The offset affects the accuracy of converter
current signal ISHARE as well as the accuracy of the converter output voltage if adaptive voltage positioning is adopted.
To reduce the offset voltage, a resistor R
CSO
should be added between the amplifier inverting input and the converter
output, as shown in Fig1
.
The
resistor R
CSO
is determined by the ratio of the bias current from the non-inverting input and
the bias current from the inverting input.
I
R
CS
CSIN
CSIN
CSO
R
I
(12)
If R
CSO
is not used, R
CS
should be chosen so that the offset voltage is small enough. Usually R
CS
should be less than 2
k
DQG WKHUHIRUH D ODUJHU &
CS
value is needed.
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 10. The resistor in series with the thermistor is
used to reduce the nonlinearity of the thermistor.
Figure 10- Temperature compensation of inductor DCR
Remote Voltage Sensing
To compensate for impedance in the ground plane, the VOSNS- pin is used for remote sensing and connects directly to
the load. The VDAC voltage is referenced to VOSNS- to avoid additional error terms or delay related to a separate
differential amplifier. The capacitor connecting the VDAC and VOSNS- pins ensure that high speed transients are fed
directly into the Error Amplifier without delay.
Master-Slave Current Share Loop
Current sharing between phases of the converter is achieved by a Master-Slave current share loop topology. The output
of the Phase 1 Current Sense Amplifier sets the reference for the Share Adjust Error Amplifier. The Share Adjust Error
Amplifier will then adjust the duty cycle of PWM Ramp2 to force its input error to zero, resulting in accurate current
sharing.
VDRP BUFFER
+
IROSC
-
+
ERROR AMPLIFIER
-
VDAC
RFB
RDRP
VDAC
EAOUT
VDRP
VOSNS-
FB
VOUT SENSE+
Current + VDAC
RLINEAR
RNTC
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| IR3092MTRPBF | 功能描述:IC CONTROLLER 2PHASE 48-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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