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TPS53851 Datasheet(PDF) 18 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) 18 Page - Texas Instruments

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background image
0.7
FBx
0
0
t0
t1
2.4
1.4
TRKx
FBx
t2
t3
VOUT
VREG
VPRE−BIAS
12
µA
6
µA
R1
R
BIAS
C
EXT
+
+
V
REF
0.7 V
+
U3
+
+
From CSx
Amplifier
+
Ramp1
U7 Comparator
12 mA
PWM
Logic
6 mA
FBx
TRKx
Error Amplifier
COMPx
UDG-09146
TPS53851
V
OUT
TPS53851
SLUS985 – DECEMBER 2009
www.ti.com
Figure 5-2. Soft-Start with PreBiased Output Waveforms
Figure 5-3. Implementation of PreBiased Output
DESIGN HINT
If the pre-biased is greater than the regulation voltage, the controller does not start. This
is a condition of an overvoltage being applied before the controller starts PWM switching.
18
APPLICATION INFORMATION
Copyright © 2009, Texas Instruments Incorporated
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Product Folder Link(s): TPS53851


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