參數(shù)資料
型號： MAX15005AAUE
廠商： Maxim Integrated Products, Inc.
英文描述： 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers
中文描述： 4.5V至40V輸入汽車反激/升壓/ SEPIC電源控制器
文件頁數(shù)： 21/29頁
文件大?。?/td> 547K
代理商： MAX15005AAUE
MOSFET, Diode, and Series Capacitor Selection
in a SEPIC Converter
For the SEPIC configuration, choose an n-channel
MOSFET with a V
DS
rating at least 20% higher than the
sum of the output and input voltages. When operating
at a high switching frequency, the gate charge and
switching losses become significant. Use low gate-
charge MOSFETs. The RMS current of the MOSFET is:
where I
LDC
= (I
LPK
-
Δ
I
L
).
Use Schottky diodes for higher conversion efficiency.
The reverse voltage rating of the Schottky diode must
be higher than the sum of the maximum input voltage
(V
IN-MAX
) and the output voltage. Since the average
current flowing through the diode is equal to the output
current, choose the diode with forward current rating of
I
OUT-MAX
. The current sense (R
S
) can be calculated
using the current-limit threshold (0.305V) of
MAX15004/MAX15005 and I
LPK
. Use a diode with a for-
ward current rating more than the maximum output cur-
rent limit if the SEPIC converter needs to be output
short-circuit protected.
Select R
CS
20% below the value calculated above.
Calculate the output current limit using the following
equation:
where D is the duty cycle at the highest input voltage
(V
IN-MAX
).
The series capacitor should be chosen for minimum rip-
ple voltage (
Δ
V
CP
) across the capacitor. We recommend
using a maximum ripple
Δ
V
CP
to be 5% of the minimum
input voltage (V
IN-MIN
) when operating at the minimum
input voltage. The multilayer ceramic capacitor X5R and
X7R series are recommended due to their high ripple
current capability and low ESR. Use the following equa-
tion to calculate the series capacitor CP value.
where
Δ
V
CP
is 0.05 x V
IN-MIN
.
For a further discussion of SEPIC converters, go to
http://pdfserv.maxim-ic.com/en/an/AN1051.pdf.
Power Dissipation
The MAX15004/MAX15005 maximum power dissipation
depends on the thermal resistance from the die to the
ambient environment and the ambient temperature. The
thermal resistance depends on the device package,
PCB copper area, other thermal mass, and airflow.
Calculate the temperature rise of the die using following
equation:
T
J
= T
C
+ (P
T
x
θ
JC
)
or
T
J
= T
A
+ (P
T
x
θ
JA
)
where
θ
JC
is the junction-to-case thermal impedance
(3°C/W) of the 16-pin TSSOP-EP package and P
T
is
power dissipated in the device. Solder the exposed
pad of the package to a large copper area to spread
heat through the board surface, minimizing the case-to-
ambient thermal impedance. Measure the temperature
of the copper area near the device (T
C
) at worst-case
condition of power dissipation and use 3°C/W as
θ
JC
thermal impedance. The case-to-ambient thermal
impedance (
θ
JA
) is dependent on how well the heat is
transferred from the PCB to the ambient. Use a large
copper area to keep the PCB temperature low. The
θ
JA
is 38°C/W for TSSOP16-EP and 90°C/W for TSSOP-16
package with the condition specified by the JEDEC51
standard for a multilayer board.
CP
I
D
V
f
OUT MAX
Δ
MAX
CP
OUT
=
×
×
I
D
D
I
I
OUT LIM
LPK
L
=
×
(
)
(
)
1
Δ
R
I
CS
LPK
=
0 305
.
I
A
( )
I
I
I
I
D
MOS RMS
LPK
LDC
LPK
LDC
MAX
3
=
+
+
×
[
]
×
(
)
(
)
(
)
2
2
M
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
______________________________________________________________________________________
21
相關(guān)PDF資料
PDF描述
MAX15005BAUE 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers
MAX15012_07 175V/2A, High-Speed, Half-Bridge MOSFET Drivers
MAX15012AASA 175V/2A, High-Speed, Half-Bridge MOSFET Drivers
MAX15012BASA 175V/2A, High-Speed, Half-Bridge MOSFET Drivers
MAX15012CASA 175V/2A, High-Speed, Half-Bridge MOSFET Drivers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX15005AAUE/V+ 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX15005AAUE/V+T 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX15005AAUE+ 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX15005AAUE+T 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX15005AAUEEVKIT+ 功能描述:電流型 PWM 控制器 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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