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TPS40140 Datasheet(PDF) 32 Page - Texas Instruments

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Part No. TPS40140
Description  Dual or 2-Phase, Stackable Controller
Download  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40140 Datasheet(HTML) 32 Page - Texas Instruments

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VOUT
CEXT
R1
+
+
0.7 V
+
U3
+
+
From CSx
Amplifier
+
Ramp1
U7 Comparator
PWM
Logic
FBx
TRKx
Error Amplifier
COMPx
RBIAS
12
µA
6
µA
VREF
UDG−06031
0.7
VOUT
FBx
0
0
t0
t1
2.4
1.4
PGOOD
TRKx
VPRE-BIAS
6 µA
12 µA
FBx
VOUT
t2
t3
UDG-12121
TPS40140
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
www.ti.com
Figure 30. Soft-Start With PreBiased Output Waveforms
Figure 31. Implementation of PreBiased Output
DESIGN HINT
If the prebiased 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.
9.1.8 Track Function in Configuring a Slave Channel
The TRKx pin is internally clamped to 2.4 V. To configure a channel as a slave, the TRKx pin is pulled up
externally to 5 V. This configures the output of the error amplifier, COMPx, for that channel to be a high
impedance, allowing the master COMP signal to control the slave channel.
32
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Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: TPS40140


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