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| 型號(hào)： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁(yè)數(shù)： | 17/66頁(yè) |
| 文件大?。?/td> | 1264K |
| 代理商： | TPS53851RHHT |
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+
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
+
=
SHR
IN
OUT
e
V
RAMP
V
+
=
5
.
12
)
R
I
(
V
RAMP
COMP
SNS
PEAK
SHR
IN
OUT
+
=
SLUS985 – DECEMBER 2009
www.ti.com
5.23
CURRENT SENSE
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:
(7)
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:
(8)
Combining equations:
(9)
This equation for COMP shows the reason for resistors R1 and R2 being tied to VSHR and VOUT
respectively.
24
APPLICATION INFORMATION
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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