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參數(shù)資料
| 型號(hào)： | MAX5025 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters |
| 中文描述： | 500kHz、36V輸出、SOT23封裝、PWM升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大小： | 258K |
| 代理商： | MAX5025 |
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M
500kHz, 36V Output, SOT23, PWM Step-Up
DC-DC Converters
_______________________________________________________________________________________
9
where V
REF
is 1.25V
Determining Peak Inductor Current
If the boost converter remains in the discontinuous
mode of operation, then the approximate peak inductor
current, I
LPEAK
, is represented by the formula below:
(
where T
S
is the period, V
OUT
is the output voltage, V
IN
is the input voltage, I
OUT
is the output current, and
η
is
the efficiency of the boost converter.
Determining the Inductor Value
47μH is the recommended inductor value when the out-
put voltage is 30V and the input voltage is 5V. In gener-
al, the inductor should have a current rating greater
than the current-limit value. For example, the inductor
’
s
current rating should be greater than 150mA to support
a 4mA output current. Equivalent series resistance
(ESR) should be below 1
for reasonable efficiency.
Due to the MAX5025
–
MAX5028
’
s high switching fre-
quency, inductors with a ferrite core or equivalent are
recommended. Powdered iron cores are not recom-
mended due to their high losses at frequencies over
500kHz. Table 1 shows a list of vendors and 47μH
inductor parts.
For 4mA output current and output voltages other than
30V, the inductor can be simply scaled in value
according to the following formula:
Use the following formula to calculate the upper bound
of the inductor value at different output voltages and
output currents. This is the maximum inductance value
for discontinuous mode operation.
(
2
Calculate the lower bound, L
LOWER
, for the acceptable
inductance value using the following formula, which will
allow the maximum output current to be delivered with-
out reaching the peak current limit:
(
5
Notice that the switch current limit, (V
IN
/5)(260mA), is a
function of the input voltage, V
IN
. The current rating of
the inductor should be greater than the switch current
limit.
L
T
V
V
I
V
mA
LOWER
S
OUT
IN
OUT
2
IN
=
)
(
)
2
260
η
L
V
V
V
2
T
I
V
UPPER
OUT
IN
S
OUT
OUT
IN
=
)
2
η
L
H V
(
V
V
OUT
IN
=
(
25
)
)
47
μ
I
T
V
V
I
L
LPEAK
S
OUT
IN
OUT
=
)
2
η
R
R
V
V
OUT
REF
1
2
1
=
-
CONTROL
LOGIC
MAIN PWM
COMPARATOR
CURRENT-
LIMIT
COMPARATOR
FB
REF
-A
+A
+C
-C
MAX5025
MAX5026
THERMAL
SHUTDOWN
OSCILLATOR
ULVO
PGND
3
GND
2
V
CC
5
SHDN
4
1
6
LX
N
Table 1. Inductor Vendors
VENDOR
PHONE
847-639-6400
847-545-6700
847-297-0070
FAX
PART NUMBER OF 47μH INDUCTOR
DT1608C-473
CDRH4D28-470
A915BY-470M
Coilcraft
Sumida
Toko
847-639-1469
847-545-6720
847-699-7864
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5025_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters |
| MAX5025ESA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5025ETT+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX5025EUT | 制造商:Maxim Integrated Products 功能描述:500KHZ, 36V OUTPUT, SOT23, PWM STEP-UP DC-DC - Cut Tape Product |
| MAX5025EUT+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 6PIN SOT-23 - Rail/Tube |
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