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TPS40140 Datasheet(PDF) 35 Page - Texas Instruments

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) 35 Page - Texas Instruments

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background image
OUT
SHR
PEAK
SNS
IN
ph
V
RAMP
COMP
RAMP
V
(I
R
) 12.5
V
2N
=
´
+
+
+
´
´
OUT
e
SHR
IN
ph
V
RAMP
V
RAMP
V
V
2N
=
´
+
+
5
.
12
)
R
I
(
V
COMP
SNS
PEAK
e
´
´
+
=
Error
Amplifier
PWM
CSn
Ramp
U1
VSHARE
CS gain = 12. 5
COMP
CSRTn
RSNS
VOUT
IOUT
U2
U3
U4
U5
U6
20 µA
U7
Overcurrent
+
+
+
+
+
+
R2
R1
ILIM
VOUT
0.5 V
0 V
+
1.8 V
UDG-12122
Ve
+
VC
TPS40140
www.ti.com
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
9.1.17
Current Sense
Figure 35 shows the current sensing and overcurrent detection architecture.
Figure 35. 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:
(8)
This is integral in the overcurrent detection as can be seen at comparator U7, comparing the ILIM voltage with
COMP. In order to have the proper duty cycle at PWM, Ve is shown in Equation 9.
where
Nph is 6 if PHSEL voltage = 1.6 ± 0.2 V, otherwise Nph is 8
(9)
Combining equations:
(10)
Equation 10 shows the reason for resistors R1 and R2 being tied to VSHR and VOUT, respectively.
Copyright © 2005–2015, Texas Instruments Incorporated
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