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參數(shù)資料
| 型號： | TPS54225PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | GREEN, PLASTIC, HTSSOP-14 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大?。?/td> | 733K |
| 代理商： | TPS54225PWPR |
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
R
2
)
1
2
P
OUT
F
L
C
p
=
SLVSA15C
– OCTOBER 2009 – REVISED FEBRUARY 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 is an LC circuit. This LC filter has double pole at:
(4)
12
2009–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54225
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