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參數(shù)資料
| 型號： | TPS54622RHLT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 15 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14 |
| 封裝： | 3.50 X 3.50 MM, GREEN, PLASTIC, QFN-14 |
| 文件頁數(shù)： | 17/36頁 |
| 文件大小： | 1190K |
| 代理商： | TPS54622RHLT |
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2
f
p
=
×
Iout
pmod
Vout Cout
1
2
f
p
=
×
zm od
RESR Cout
f
=
×
co
pmod
zmod
2
f
=
×
sw
co
pmod
2
f
p ×
×
=
×
ea
ps
c Vout Cout
R4
gm
Vref gm
×
=
×
Vout Cout
C4
Iout R4
×
=
RESR Cout
C5
R4
V = 5 V / div
IN
V
= 1 V / div
OUT
Time = 2 msec / div
V
= 100 mV / div (dc coupled, -3.13 V offset)
OUT
I
= 2 A / div
OUT
Load step = 1.5 A to 4.5 A Slew rate = 100 mA / sec
Time = 200 sec / div
SLVSA70
– MARCH 2011
For Cout, use a derated value of 75
F. use Equation 33 and Equation 34 to estimate a starting point for the
closed loop crossover frequency fco. Then the required compensation components may be derived. For this
design example, fpmod is 3.86 kHz and fzmod is 707.4 kHz. Equation 33 is the geometric mean of the modulator
pole and the esr zero and Equation 34 is the geometric mean of the modulator pole and one half the switching
frequency. Use a frequency near the lower of these two values as the intended crossover frequency fco. In this
case Equation 33 yields 52.2 kHz and Equation 34 yields 30.4 kHz. The lower value is 30.4 kHz. A slightly higher
frequency of 30 kHz is chosen as the intended crossover frequency.
(31)
(32)
(33)
(34)
Now the compensation components can be calculated. First calculate the value for R2 which sets the gain of the
compensated network at the crossover frequency. Use Equation 35 to determine the value of R2.
(35)
Next calculate the value of C3. Together with R2, C3 places a compensation zero at the modulator pole
frequency. Equation 36 to determine the value of C3.
(36)
Using Equation 35 and Equation 36 the standard values for R4 and C4 are 3.74 k
and 0.01 F.
An additional high frequency pole can be used if necessary by adding a capacitor in parallel with the series
combination of R4 and C4. The pole frequency can be placed at the ESR zero frequency of the output cpacitor
as given by Equation 13. Use Equation 37 to calculate the required capacitor value for C5.
(37)
Application Curves
LOAD TRANSIENT
STARTUP with VIN
Figure 30.
Figure 31.
24
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS54622
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