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参数资料
| 型号： | TPS40195RGYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 19/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195RGYR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页
( )
6
OUT
SCP
PK
3
START
300
10
1.8
C
V
I
11.05
11.32 A
t
2
10
-
+
=
+
=
(31)
(
)
(
)
(
)
(
)
(
)
(
)
3
DS on (max)
SCP min
ILIMOFSET min
ILIM min
6
LIM(min)
R
I
V
(4.88
10
14)
20mV
R
12.6k
I
7.0
10
-
-
+
=
W
(32)
(
)
(
)
(
)
(
)
( )(
)
ILIM min
ILIMOFST min
SCP min
DS on max
I
R
V
I
R
+
=
(33)
(
)
(
)
(
)
(
)
(
)
ILIM max
ILIMOFST max
SCP max
DS(on) min
I
R
V
I
R
+
=
(34)
(
)
g TOT
BOOST
Q
C
V
>
(35)
SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008 ........................................................................................................................................ www.ti.com
Short Circuit Protection, RILIM
Short circuit protection is programmed using the RILIM resistor. Selection of this resistor depends on the RDS(on) of
the switching MOSFET and the required short circuit current trip point, ISCP. The minimum ISCP must exceed the
sum of the output current, the peak ripple current, and the output capacitor charging current during start up.
Equation 30 gives this minimum.
The minimum short circuit current trip point for this design is set to 14 A. Equation 32 is then used to calculate
the minimum RILIM value.
RILIM is calculated to be 12.6 k . The closest standard value of 12.7 k is used. The minimum and maximum
short circuit current can be calculated using Equation 33 and Equation 34 .
The minimum ISCP is 14 A and the maximum is 46 A.
Voltage Decoupling Capacitors, CBP, and CVDD
Two pins on the TPS40195 have DC voltages. It is recommended to add small decoupling capacitors to these
pins. Below are the recommended values.
C
BP = 4.7 F
C
VDD = 0.1 F
Boost Voltage, CBOOST and DBOOST (optional)
Selection of the boost capacitor is based on the total gate charge of the switching MOSFET and the allowable
ripple on the boost voltage, VBOOST. A ripple of 0.2 V is assumed for this design. Using these two parameter and
equation (26) the minimum value for CBOOST can be calculated.
The total gate charge of the switching MOSFET is 13.3 nC. A minimum CBOOST of 0.066-F is required. A 0.1-F
capacitor was chosen. This capacitor must be able to withstand the maximum input voltage plus the maximum
voltage on BP. This is 16 V plus 5.4 V which is 21.4 V. A 50-V capacitor is used.
To reduce losses in the TPS40195 and to increase the available gate voltage for the switching MOSFET an
external diode can be added between the BP pin and the BOOST pin of the device. A small signal schottky
should be used here, such as the BAT54.
Closing the Feedback Loop RZ1, RP1, RPZ2, RSET1, RSET2, CZ2, CP2 AND CPZ1
A graphical method is used to select the compensation components. This is a standard feedforward buck
converter. Its PWM gain is given by the following equation.
26
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40195
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