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)： 29/58頁
文件大?。?/td> 1773K
代理商： TPS54383PWPR
www.ti.com
(
) (
)
IN
BR R min
V
1.2
V
(27)
(
)
(
)
(
)
D avg
OUT max
I
1 D
-
(28)
(
)
(
)
FM
D m ax
D avg
P
V
I
(29)
Output Capacitor Selection
(
)
OUT
2
RES
1
C
4
f
L
=
p
(30)
OUT
RIPPLE(tot)
RIPPLE(cap)
RIPPLE(tot)
(max)
RIPPLE
S
V
D
ESR
I
f
C
-
=
-
(31)
Voltage Setting
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
The diode must have reverse breakdown voltage greater than 15.8 V, therefore a 20-V device is used.
The average current in the rectifier diode is estimated by Equation 28.
For this design, 1.2-A (average) and 2.25 A (peak) is estimated for Channel 1 and 1.5-A (average) and 2.21-A
(peak) for Channel 2.
An MBRS320, 20-V, 3-A diode in an SMC package is selected for both channels. This diode has a forward
voltage drop of 0.4 V at 2 A.
The power dissipation in the diode is estimated by Equation 29.
For this design, the full load power dissipation is estimated to be 480 mW in D1, and 580 mW in D2.
The TPS54383's internal compensation limits the selection of the output capacitors. From Figure 25, the internal
compensation has a double zero resonance at about 3 kHz. The output capacitor is selected by Equation 30.
Solving for COUT using
f
RES = 3 kHz
L = 22 H
The resulting is COUT = 128 F. The output ripple voltage of the converter is composed of the ripple voltage
across the output capacitance and the ripple voltage across the ESR of the output capacitor. To find the
maximum ESR allowable to meet the output ripple requirements the total ripple is partitioned, and the equation
manipulated to find the ESR.
Based on 128
F of capacitance, 300-kHz switching frequency and 50-mV ripple voltage plus rounding up the
ripple current to 0.5 A, and the duty cycle to 50%, the capacitive portion of the ripple voltage is 6.5 mV, leaving a
maximum allowable ESR of 87 m
.
To meet the ripple voltage requirements, a low-cost 100-
F electrolytic capacitor with 400 m ESR (C5, C17)
and two 10-
F ceramic capacitors (C3 and C4; and C18 and C19) with 2.5-m ESR are selected. From the
datasheets for the ceramic capacitors, the parallel combination provides an impedance of 28 m
@ 300 kHz for
14 mV of ripple.
The primary feedback divider resistors (R2, R9) from VOUT to FB should be between 10 k
and 50 k to
maintain a balance between power dissipation and noise sensitivity. For this design, 20 k
is selected.
The lower resistors, R4 and R7 are found using the following equations.
Copyright 2007, Texas Instruments Incorporated
35
Product Folder Link(s): TPS54383 TPS54386
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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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