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參數資料
型號: TPS53851RHHT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩壓器
英文描述: SWITCHING CONTROLLER, PQCC36
封裝: PLASTIC, VQFN-36
文件頁數: 37/66頁
文件大?。?/td> 1264K
代理商: TPS53851RHHT
V
C + VIN * VOUT
V
OUT
R1
C1
f
SW
V
IN
) IOC
DCR
R1
L1
DCR
C1
To CSRTx
To CSx
R2
VOUT
VIN
+
VC
R1
R2 +
L1
DCR
C1
R2
R1 ) R2
SLUS985 – DECEMBER 2009
www.ti.com
(17)
As the DC load increases the majority of the voltage, VC, is determined by (IOC ×DCR), where IOC is the
per phase DC output current. It is important that at the overcurrent set point that the peak voltage of VC
does not exceed 60 mV, the maximum differential input voltage. If the voltage VC exceeds 60 mV, a
resistor, R2,can be added in parallel with C1 as shown in Figure 5-24. Adding R2 reduces the equivalent
inductor DCR by the ratio shown in Equation 19
Figure 5-24. Using Resistor R2 to Reduce the Current Sense Amplifier Voltage
The parallel combination of R1 and R2 is shown in Equation 18.
(18)
The ratio shown in Equation 19 provides the required voltage attenuation.
(19)
42
APPLICATION INFORMATION
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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