參數(shù)資料
型號(hào)： TPS51317RGBT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 3.50 MM, GREEN, PLASTIC, QFN-20
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 1000K
代理商： TPS51317RGBT
-
=
=
P P
I
6 A
0.4
2.4 A
(
)
(
)
(
)
(
)
-
-
-
÷
÷
÷
÷
è
è
=
m
OUT
IN
OUT
SW
IN
P P
V
1.5
V
5
1.5
f
V
1 5
V
dT
L
0.43 H
I
1.5 A
=
+
VREF
OUT
LOWER
UPPER
LOWER
V
R
(
)
(
)
-
=
+
=
+
=
P P
OCL dc
OCL valley
1
I
6 A
1.5 A
6.75 A
2
SLUSAH9
– MARCH 2011
DESIGN PROCEDURE
The simplified design procedure is done for a non-droop application using the TPS51317 converter.
Step One
Determine the specifications.
The Rail requirements provide the following key parameters:
1. VOUT = 1.5 V
2. ICC(max) = 6 A
3. IDYN(max) = 3 A
4. ICC(tdc) = 3 A
Step Two
Determine system parameters.
The input voltage range and operating frequency are of primary interest. For example:
1. VIN = 5 V
2. fSW = 1 MHz
Step Three
Determine inductor value and choose inductor.
Smaller values of inductor have better transient performance but higher ripple and lower efficiency. Higher values
have the opposite characteristics. It is common practice to limit the ripple current to 25% to 50% of the maximum
current. In this case, use 40%:
(5)
At fSW = 1 MHz, with a 5-V input and a 1.5-V output:
(6)
For this application, a 0.42-
H, 1.55-mΩ inductor from NEC-TOKIN with part number MPCG0740LR42C is
chosen.
Step Four
Set the output voltage.
(7)
The output voltage is determined by the 2-V reference (VREF) and the resistor dividers (RUPPER and RLOWER).
The output voltage is regulated to the REFIN pin. Because the 2-V reference current capability is limited to less
than 50
A, care should be taken when selecting the resistor dividers. For the current reference design of 1.5 V
(see application schematics shown in Figure 1 and Figure 2, RUPPER = 100 kΩ, RLOWER = 300 kΩ.
Step Five
Calculate OCL.
The DC OCL level of TPS51317 design is determined by Equation 8,
(8)
Copyright
2011, Texas Instruments Incorporated
19
Product Folder Link(s): TPS51317
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