參數(shù)資料
型號： TPS54226RGTT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, PQCC16
封裝： GREEN, PLASTIC, QFN-16
文件頁數(shù)： 5/27頁
文件大?。?/td> 923K
代理商： TPS54226RGTT
V
=
OUT
0.765
(1+ R1
R2
)
V
=
V
OUT
OUT_SET
(0.763 + 0.0017
)
1 +
( R1
R2
)
SLVSA14D
– 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 14 shows the schematic diagram for this design example.
Figure 14. 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 3 and Equation 4 to calculate VOUT.
To improve efficiency at very light loads consider using larger value resistors, too high of resistance is more
susceptible to noise and voltage errors from the VFB input current are more noticeable.
For output voltage from 0.76 V to 2.5 V:
(3)
For output voltage over 2.5 V:
(4)
Where:
VOUT_SET = Target VOUT voltage
2009–2011, Texas Instruments Incorporated
13
Product Folder Link(s): TPS54226
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