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參數資料
| 型號： | TPS55383PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 7 A DUAL SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-26 |
| 文件頁數： | 27/45頁 |
| 文件大小： | 1318K |
| 代理商： | TPS55383PWPRG4 |
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(
)
RIPPLE1
RIPPLE1( total)
OUT1
SW
max
RIPPLE1
I
0.661A
V
0.050 V
8
C
f
8
8.2 F
600 kHz
ESR1
0.024
F
I
0.661A
-
÷
÷
m
è
è
=
W
(42)
(
)
RIPPLE
RIPPLE(total)
OUT1
SW
max
RIPPLE
I
0.547 A
V
0.050 V
8
C
f
8 12.4 F
600 kHz
ESR
0.033
F
I
0.547 A
-
÷
÷
m
è
è
=
W
(43)
(
)
(
)
RMS _ CIN
OUT
I
D
1 D
3 A
0.5
1
0.5
1.5 A
=
-
=
-
=
(44)
FB
BIAS
OUT
FB
V
R
V
=
-
(45)
(
)
6
7
ON
3
M1
1.5 10
t
(1.5 10
6.68 10
)
6
IN
OUT1
600000
F
5.82 10
13.2
5.0
V
19.7
e
50 10
19.7
e
50 10
8.2 H
L
-
-
=
-
+
+
÷
÷
m
è
è
www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008
The maximum ESR to meet the ripple specification is given by:
A single 22-
F ceramic capacitor with approximately 2.5 m of ESR is selected to provide sufficient margin for
capacitance loss due to DC voltage bias.
Input Capacitor Selection
The TPS55386 datasheet recommends a 10
F (minimum) ceramic bypass capacitor on each PVDD pin. While
out of phase operation reduces input RMS current, the input capacitors must be sized to support the greater of
the two input RMS currents, or 1.5A to allow operation when one channel is at maximum load and the other is
un-loaded. The ceramic capacitor must handle the RMS input ripple current of the converter.
The RMS current in the input capacitors is estimated by:
One 1210 size 10-
F, 25-V, X5R ceramic capacitor with a 2-m ESR and a 2-A RMS current rating are selected
to bypass each PVDD input. Higher voltage capacitors minimize capacitance loss under DC bias voltage,
ensuring the capacitors have sufficient capacitance at their working voltage.
Voltage Feedback
The primary feedback divider resistor (RFB) from VOUT to FB should be selected between 10 k and 100 k to
maintain a balance between power dissipation and noise sensitivity. For a 3.3-V and 5-V output, 20.5 k
is
selected, so the lower resistor is given by:
For RFB = R2 = R9 = 20.5 k and VFB = 0.80V, RBIAS1 = 3.90k and RBIAS2 = 6.5k (R4 = 3.83k and
R7 = 6.49 k
selected) for 5.0 V and 3.3 V respectively.
Compensation Components
The TPS55386 controller uses an internal transconductance error amplifier, which compares the feedback
voltage to the internal 0.80-V reference and sources a current proportional to the resulting error out of the COMP
pin. A series resistor and capacitor to ground generate an integrator with zero while a high frequency capacitor
provides a second pole to reduce the high frequency gain. The compensation loop components are selected by
the following equations with the 5.0-V output used in example calculations:
Calculate the modulator gain at DC:
(46)
Copyright 2008, Texas Instruments Incorporated
33
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS55386EVM-363 | 功能描述:電源管理IC開發工具 TPS55386EVM-363 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS55386PWP | 功能描述:直流/直流開關調節器 3A Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS55386PWPG4 | 功能描述:直流/直流開關調節器 3A,Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS55386PWPR | 功能描述:直流/直流開關調節器 3A Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS55386PWPRG4 | 功能描述:直流/直流開關調節器 3A,Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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