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| 型号： | TPS54225TPWPRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO14 |
| 封装： | PLASTIC, TSSOP-14 |
| 文件页数： | 4/18页 |
| 文件大小： | 354K |
| 代理商： | TPS54225TPWPRQ1 |
VIN
4.5to18V
10
VOUT
1.05V,2A
U1
TPS542225PWP
11
9
12
6
3
8
SW1
SW2
PGND2
VBST
PG
VREG5
PGND1
14
15
13
5
1
2
4
7
VCC
VIN
GND
VO
VFB
SS
EN
PwPd
V
=
OUT
0.765
(1+
R1
R2
)
V
=
V
OUT
(0.763+0.0017
)
(1+
R1
R2
)
1
2
P
OUT
F
L
C
p
=
SLVSAV9
– JUNE 2011
DESIGN GUIDE
Step By Step Design Procedure
To begin the design process, the following application parameters must be known:
Input voltage range
Output voltage
Output current
Output voltage ripple
Input voltage ripple
Figure 13. Schematic Diagram
Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use
1% tolerance or better divider resistors. Start by using Equation 2 and Equation 3 to calculate VOUT.
To improve efficiency at light loads consider using larger value resistors, too high of resistance is more
susceptible to noise and voltage errors from the VFB input current is more noticeable.
For output voltage from 0.76 V to 2.5 V:
(2)
For output voltage over 2.5 V:
(3)
Where:
VOUT_SET = Target VOUT voltage
Output Filter Selection
The output filter used with the TPS54225-Q1 is an LC circuit. This LC filter has double pole at:
(4)
12
Copyright
2011, Texas Instruments Incorporated
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