參數(shù)資料
型號： TPS54383PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 7 A DUAL SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO14
封裝： GREEN, PLASTIC, HTSSOP-14
文件頁數(shù)： 16/58頁
文件大?。?/td> 1773K
代理商： TPS54383PWPR
www.ti.com
Example: TPS54386 Buck Converter Operating at 12-V Input, 3.3-V Output and 400-mA(P-P) Ripple Current
V
OUT
DIODE
+ V
V
IN
+ VDIODE
3.3
0.5
+
12
0.5
+
d =
=
=30%
(10)
IN
OUT
S
L
V
12
3.3
1
L
T
0.3
10.9 H
I
0.4
600000
-
=
d
=
=
m
D
(11)
(
)
(
)
2
6
RES
1
C
70 F
10 10
2
3.14
6000
L
2
f
-
=
m
p
(12)
(
)
f
ESR
6
RES
1
R
40 m
2
10
C
2
3.14 10
6000
68
10
-
<
=
W
p
(13)
100
1M
1k
100k
10k
-20
20
40
80
0
60
-180
-90
-45
45
90
-135
0
180
135
f
Frequency
Hz
-
Gain
Phase
-10
10
50
30
70
Gain
dB
-
Phase
-
°
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
First, the steady state duty cycle is calculated. Assuming the rectifier diode has a voltage drop of 0.5 V, the duty
cycle is approximated using Equation 10.
The filter inductor is then calculated; see Equation 11.
A custom-designed inductor may be used for the application, or a standard value close to the calculated value
may be used. For this example, a standard 10-
H inductor is used. Using Figure 28, find the 30% duty cycle
curve. The 30% duty cycle curve has a down slope from low frequency and rises at approximately 6 kHz. This
curve is the resonant frequency that must be compensated. Any frequency wthin an octave of the peak may be
used in calculating the capacitor value. In this example, 6 kHz is used.
A 68-
F capacitor should be used as a bulk capacitor, with up to 10 F of ceramic bypass capacitance. To
ensure the ESR zero does not significantly impact the loop response, the ESR of the bulk capacitor should be
placed a decade above the resonant frequency.
The resulting loop gain and phase are shown in Figure 31. Based on measurement, loop crossover is 45 kHz
with a phase margin of 60 degrees.
GAIN AND PHASE
vs
FREQUENCY
Figure 31. Example Loop Result
Copyright 2007, Texas Instruments Incorporated
23
Product Folder Link(s): TPS54383 TPS54386
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54383PWPRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54386 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio
TPS54386EVM 功能描述:電源管理IC開發(fā)工具 TPS54386 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS54386PWP 功能描述:直流/直流開關(guān)調(diào)節(jié)器 DC/DC Controller RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54386PWP 制造商:Texas Instruments 功能描述:DC/DC Controller
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