參數(shù)資料
型號(hào)： MAX5035DUPA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： 1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
中文描述： 2.5 A SWITCHING REGULATOR, 135 kHz SWITCHING FREQ-MAX, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 11/17頁(yè)
文件大小： 382K
代理商： MAX5035DUPA
M
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
______________________________________________________________________________________
11
Ensure that the ripple specification of the input capaci-
tor exceeds the worst-case capacitor RMS ripple cur-
rent. Use the following equations to calculate the input
capacitor RMS current:
I
PRMS
is the input switch RMS current, I
AVGin
is the
input average current, and
η
is the converter efficiency.
The ESR of aluminum electrolytic capacitors increases
significantly at cold temperatures. Use a 1μF or greater
value ceramic capacitor in parallel with the aluminum
electrolytic input capacitor, especially for input voltages
below 8V.
Output Filter Capacitor
The worst-case peak-to-peak and RMS capacitor ripple
current, allowable peak-to-peak output ripple voltage,
and the maximum deviation of the output voltage dur-
ing load steps determine the capacitance and the ESR
requirements for the output capacitors.
The output capacitance and its ESR form a zero, which
improves the closed-loop stability of the buck regulator.
Choose the output capacitor so the ESR zero frequency
(f
Z
) occurs between 20kHz to 40kHz. Use the following
equation to verify the value of f
Z
. Capacitors with 100m
to 250m
ESR are recommended to ensure the closed-
loop stability, while keeping the output ripple low.
The output ripple is comprised of
V
OQ
(caused by the
capacitor discharge) and
V
OESR
(caused by the ESR
of the capacitor). Use low-ESR tantalum or aluminum
electrolytic capacitors at the output. Assuming that the
contribution from the ESR and capacitor discharge
equal 80% and 20% respectively, calculate the output
capacitance and the ESR required for a specified rip-
ple using the following equations:
The MAX5035 has an internal soft-start time (t
SS
) of
400μs. It is important to keep the output rise time at
startup below t
SS
to avoid output overshoot. The output
rise time is directly proportional to the output capacitor.
Use 68μF or lower capacitance at the output to control
the overshoot below 5%.
In a dynamic load application, the allowable deviation
of the output voltage during the fast-transient load dic-
tates the output capacitance value and the ESR. The
output capacitors supply the step load current until the
controller responds with a greater duty cycle. The
response time (t
RESPONSE
) depends on the closed-
loop bandwidth of the converter. The resistive drop
across the capacitor ESR and capacitor discharge
cause a voltage droop during a step load. Use a com-
bination of low-ESR tantalum and ceramic capacitors
for better transient load and ripple/noise performance.
Keep the maximum output voltage deviation above the
tolerable limits of the electronics being powered.
Assuming a 50% contribution each from the output
capacitance discharge and the ESR drop, use the fol-
lowing equations to calculate the required ESR and
capacitance value:
where I
STEP
is the load step and t
RESPONSE
is the
response time of the controller. Controller response
time is approximately one-third of the reciprocal of the
closed-loop unity-gain bandwidth, 20kHz typically.
PC Board Layout Considerations
Proper PC board layout is essential. Minimize ground
noise by connecting the anode of the Schottky rectifier,
the input bypass capacitor ground lead, and the output
filter capacitor ground lead to a single point (
“
star
”
C
I
t
V
OUT
STEP
RESPONSE
OQ
=
×
ESR
V
I
STEP
OUT
OESR
=
C
I
V
f
OUT
L
OQ
SW
≈
×
×
2 2
ESR
V
I
OUT
OESR
L
=
f
C
ESR
Z
OUT
OUT
=
×
×
×
1
2
π
I
I
I
I
I
D
3
I
V
I
V
I
I
I
I
I
I
and D
V
V
PRMS
PK
DC
PK
DC
AVGIN
OUT
OUT
η
IN
PK
OUT
L
DC
OUT
L
OUT
IN
=
+
+
×
(
)
×
=
×
×
=
+
=
=
2
2
2
2
,
where
I
I
I
CRMS
PRMS
AVGIN
=
2
2
相關(guān)PDF資料
PDF描述
MAX5035AUSA Circular Connector; MIL SPEC:MIL-C-5015 A/B/C; Body Material:Aluminum Alloy; Series:MS3106; No. of Contacts:4; Connector Shell Size:14S; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Gender:Female RoHS Compliant: No
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5035DUPA+ 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1A 76V MAXPower Step-Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX5035DUSA 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1A 76V MAXPower Step-Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX5035DUSA+ 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1A 76V MAXPower Step-Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX5035DUSA+T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1A 76V MAXPower Step-Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX5035DUSA-T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1A 76V MAXPower Step-Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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