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TPS53851 Datasheet(PDF) 42 Page - Texas Instruments

Part No. TPS53851
Description  DUAL OR 2-PHASE, STACKABLE CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS53851 Datasheet(HTML) 42 Page - Texas Instruments

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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
ø R2 +
L1
DCR
C1
R2
R1 ) R2
TPS53851
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
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Copyright © 2009, Texas Instruments Incorporated
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