參數(shù)資料
型號(hào)： TPS55383PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)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(shù)： 28/45頁
文件大?。?/td> 1318K
代理商： TPS55383PWPRG4
(
)
(
)
(
)
(
)
(
)
(
)
4
3
4
IN
m
1
6
3
6
IN
LOAD1
V
F
2
10
13.2
5.82
10
2
10
fc
4.63
V
Fm
50
10
13.2
5.82
10
50
10
1
R
1.67
-
=
÷
÷
+
÷
÷
W
è
è
(47)
1
EA1
CO
LOAD1
OUT1
fc
4.65
K
20
log
20
log
5.80 dB
1
2
f
R
C
1
2
35 kHz
1.67
22 F
= -
= -
=
÷
÷
+
p
+
p
W
m
è
è
(48)
(
)
(
)
EA
K
5.80 dB
20
LOWER
UPPER
COMP1
M
LOWER
10
Z
10
3.83 k
20.5 k
R
38.5 k
R15
38.3 k
g
Z
315 S
3.83 k
+
W +
W
=
W
=
W
m
W
(49)
ZERO1
OUT1
LOAD1
1
f
4.4 kHz
2
C
R
2
22 F 1.67
=
p
p
m
W
(50)
COMP1
POLE1
COMP1
1
C
967 pF
C21
1nF
2
f
R
2
4.4 kHz
3.83 k
=
=
p
p
W
(51)
HF1
CO
COMP
1
C
29.6 pF
C23
33 pF
2
4
f
R
2
4
35 kHz
38.3 k
=
=
p
p
W
(52)
SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
Then calculate the converter gain at DC:
Calculate the required error amplifier gain at the desired crossover frequency of 35 kHz:
Then compensation resistor at the output of the error amplifier is:
Calculate the required compensation zero frequency:
Then calculate the compensation capacitor:
The high-frequency pole is placed at eight times the crossover frequency:
Boot-Strap Capacitor
To ensure proper charging of the high-side FET gate and limit the ripple voltage on the boost capacitor, a 47-nF
boot strap capacitor is used.
ILIM2
The current limit must be set above the peak inductor current ILpeak. Comparing ILpeak to the available minimum
current limits, ILIM is connected to BP for a 3.6-A minimum current limit.
SEQ
The SEQ pin is left floating, leaving the enable pins to function independently. If the enable pins are tied
together, the two supplies start-up ratio-metrically. SEQ could also be connected to BP or GND to provide
sequential start-up.
34
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS55383 TPS55386
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TPS55386PWPG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A,Dual 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
TPS55386PWPR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A Dual 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
TPS55386PWPRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A,Dual 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
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