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TPS40140 Datasheet(PDF) 23 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) 23 Page - Texas Instruments

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5.23
CURRENT SENSE
+
+
+
+
CSRTn
CSn
+
_
PWM
+
+
0.5 V
0 V
ERROR AMP
COMP
CSgain = 12.5
V
SHR
, 1.8 V
I
LIM
20 mA
OVERCURRENT
R1
R2
V
OUT
R
SNS
U1
U2
U3
U4
U5
U6
U7
RAMP
V
C
+
_
V
e
V
OUT
I
OUT
5
.
12
)
R
I
(
V
COMP
SNS
PEAK
e
´
´
+
=
(8)
SHR
IN
OUT
e
V
V
V
RAMP
V
+
´
=
(9)
5
.
12
)
R
I
(
V
V
V
RAMP
COMP
SNS
PEAK
SHR
IN
OUT
´
´
+
+
´
=
(10)
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
The current sensing and overcurrent detection architecture is shown in Figure 5-8.
Figure 5-8. Output Current Sensing and OverCurrent Detection
The output current, IOUT, flows through RSNS and develops a voltage, VC across it, representative of the
output current. The voltage, VC, could also be derived from an R-C network in parallel with the output
inductor. This voltage is amplified with a gain of 12.5 and then subtracted from the Error Amp output,
COMP, to generate the Ve voltage. The Ve signal is compared to the slope-compensation RAMP signal to
generate the PWM for the modulator. As the output current is increased, the amplified VC causes the Ve
signal to decrease. In order to maintain the proper duty cycle (PWM), the COMP signal must increase.
Therefore the magnitude of the COMP signal contains the output current information:
This is integral in the overcurrent detection as can be seen at comparator U7, comparing the I
LIM voltage
with COMP. In order to have the proper duty cycle at PWM, V
e is:
Combining equations:
This equation for COMP shows the reason for resistors R1 and R2 being tied to V
SHR and VOUT
respectively.
Submit Documentation Feedback
APPLICATION INFORMATION
23


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