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參數(shù)資料
| 型號(hào)： | MAX5035 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter |
| 中文描述： | 1A、76V、高效MAXPower降壓型DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 382K |
| 代理商： | MAX5035 |
M
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
10
______________________________________________________________________________________
The MAX5035 features internal compensation for opti-
mum closed-loop bandwidth and phase margin. With
the preset compensation, it is strongly advised to sense
the output immediately after the primary LC.
Inductor Selection
The choice of an inductor is guided by the voltage dif-
ference between V
IN
and V
OUT
, the required output
current, and the operating frequency of the circuit. Use
an inductor with a minimum value given by:
where:
I
OUTMAX
is the maximum output current required, and
f
SW
is the operating frequency of 125kHz. Use an induc-
tor with a maximum saturation current rating equal to at
least twice the peak output current of the circuit. Use
inductors with low DC resistance for higher efficiency.
Selecting a Rectifier
The MAX5035 requires an external Schottky rectifier as
a freewheeling diode. Connect this rectifier close to the
device using short leads and short PC board traces.
Choose a rectifier with a continuous current rating
greater than the highest expected output current. Use a
rectifier with a voltage rating greater than the maximum
expected input voltage, V
IN
. Use a low forward-voltage
Schottky rectifier for proper operation and high efficien-
cy. Avoid higher than necessary reverse-voltage
Schottky rectifiers that have higher forward-voltage
drops. Use a Schottky rectifier with forward-voltage
drop (V
FB
) less than 0.45V at +25
°
C and maximum load
current to avoid forward biasing of the internal body
diode (LX to ground). Internal body diode conduction
may cause excessive junction temperature rise and
thermal shutdown. Use Table 1 to choose the proper
rectifier at different input voltages and output current.
Input Bypass Capacitor
The discontinuous input current waveform of the buck
converter causes large ripple currents in the input
capacitor. The switching frequency, peak inductor cur-
rent, and the allowable peak-to-peak voltage ripple that
reflects back to the source dictate the capacitance
requirement. The MAX5035 high switching frequency
allows the use of smaller value input capacitors.
The input ripple is comprised of
V
Q
(caused by the
capacitor discharge) and
V
ESR
(caused by the ESR of
the capacitor). Use low-ESR aluminum electrolytic
capacitors with high ripple-current capability at the input.
Assuming that the contribution from the ESR and capaci-
tor discharge is equal to 90% and 10%, respectively, cal-
culate the input capacitance and the ESR required for a
specified ripple using the following equations:
I
OUT
is the maximum output current of the converter
and f
SW
is the oscillator switching frequency (125kHz).
For example, at V
IN
= 48V, V
OUT
= 3.3V, the ESR and
input capacitance are calculated for the input peak-to-
peak ripple of 100mV or less yielding an ESR and
capacitance value of 80m
and 51μF, respectively.
Low-ESR, ceramic, multilayer chip capacitors are recom-
mended for size-optimized application. For ceramic
capacitors, assume the contribution from ESR and capaci-
tor discharge is equal to 10% and 90%, respectively.
The input capacitor must handle the RMS ripple current
without significant rise in temperature. The maximum
capacitor RMS current occurs at about 50% duty cycle.
D
V
V
OUT
IN
=
I
V
V
V
V
f
L
L
IN
OUT
×
OUT
IN
SW
=
×
×
(
)
,
C
I
D
×
D
V
f
IN
OUT
Q
SW
=
×
(
)
1
ESR
V
I
I
IN
ESR
OUT
L
=
+
2
D
V
V
OUT
IN
=
L
V
V
D
f
SW
I
IN
×
OUT
OUTMAX
=
×
×
(
)
.2
V
IN
(V)
DIODE PART NUMBER
15MQ040N
B240A
B240
MBRS240, MBRS1540
30BQ060
B360A
CMSH3-60
MBRD360, MBR3060
50SQ100, 50SQ80
MBRM5100
MANUFACTURER
IR
Diodes, Inc.
Central Semiconductor
ON Semiconductor
IR
Diodes, Inc.
Central Semiconductor
ON Semiconductor
IR
Diodes, Inc.
7.5 to 36
7.5 to 56
7.5 to 76
Table 1. Diode Selection
where
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5035_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter |
| MAX5035_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter |
| MAX5035AAPA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5035AASA | 功能描述:直流/直流開關(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 |
| MAX5035AASA/V+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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