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TPS40140 Datasheet(PDF) 17 Page - Texas Instruments

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Part No. TPS40140
Description  DUAL OR 2-PHASE, STACKABLE CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40140 Datasheet(HTML) 17 Page - Texas Instruments

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0.7
FBx
0
0
t0
t1
2.4
1.4
TRKx
FBx
t2
t3
VOUT
VREG
VPRE−BIAS
12
µA
6
µA
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
5.6 TRACK FUNCTION IN CONFIGURING A SLAVE CHANNEL
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
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.
The TRACKx pin is internally clamped to 2.4 V. To configure a channel as a Slave, the TRACKx 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.
Submit Documentation Feedback
APPLICATION INFORMATION
17


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