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| 型号： | TPS54162QPWPRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 21/41页 |
| 文件大小： | 2414K |
| 代理商： | TPS54162QPWPRQ1 |
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L
=
Min
(VIN
– V )×V
Max
Reg
f ×I
×VIN
sw
Ripple
Max
I
=
L,RMS
I
+
Load
2
I
Ripple
2
12
I
=I
+
L,pk
Load
I
Ripple
2
P
=
diode
(VIN
– V )×I
×V
Max
Reg
Load
fd
VIN
Max
(VIN – V )×f ×C
fd
sw
J
2
+
SLVSA32C – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
5) Power-On Reset Delay (PORdly) Capacitor (C2)
The value of this capacitor can be calculated using Equation 9.
6) Output Inductor (L1)
Use a low EMI inductor with a ferrite type shielded core. Other types of inductors may be used; however, they
must have low EMI characteristics and should be located away from the low-power traces and components in the
circuit.
To calculate the minimum value of the inductor, the ripple current should be first calculated using Equation 40.
IRipple = KIND × ILoad
(40)
Where,
ILoad = maximum output load current
IRipple = allowable peak to peak inductor ripple current, typ. 20% of maximum ILoad
KIND = coefficient that represents the amount of inductor ripple current relative to the maximum output
current. Since, the inductor ripple current is filtered by the output capacitor; therefore KIND is typically in the
range of 0.2 to 0.3, depending on the ESR and the ripple current rating of the output capacitor (C4).
The minimum value of output inductor can be calculated using Equation 41.
(41)
Where,
VINMax = maximum input voltage
VReg = regulated output voltage
fsw = switching frequency
The RMS and peak currents flowing in the inductor are given by Equation 42 and Equation 43.
(42)
(43)
7) Flyback Schottky Diode (D2)
The TPS54162 requires an external Schottky diode connected between the PH and power ground termination.
The absolute voltage at PH should not go beyond the values in Absolute Maximum Ratings. The Schottky diode
conducts the output current during the off state of the internal power switch. This Schottky diode must have a
reverse breakdown voltage higher than the maximum input voltage of the application. A Schottky diode is
selected for its lower forward voltage. The Schottky diode is selected based on the appropriate power rating,
which factors in the DC conduction losses and the AC losses due to the high switching frequencies; this is
determined by Equation 44.
(44)
Where,
Pdiode = power rating
Vfd = forward conducting voltage of Schottky diode
CJ = junction capacitance of the Schottky diode
Recommended part numbers are PDS 360 and SBR8U60P5.
8) Resistor to Set Slew Rate (R7)
The slew rate setting is asymmetrical; i.e., for a selected value of R7, the rise time and fall time are different. R7
.
28
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54162-Q1
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