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參數(shù)資料
| 型號： | MAX5949BESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And C 14-CDIP -55 to 125 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 269K |
| 代理商： | MAX5949BESA |
Component Selection Procedure
Determine load capacitance:
C
L
= C2 + C3 + module input capacitance
Determine load current, I
LOAD
.
Select circuit-breaker current; for example:
I
CB
= 2 x I
LOAD
Calculate R
SENSE
:
=
50
Realize that I
CB
varies ±20% due to trip-voltage
tolerance.
Set allowable inrush current:
Determine value of C2:
Calculate value of C1:
Determine value of R3:
If an optocoupler is utilized as in Figure 15, deter-
mine the LED series resistor:
V
mA
3
Set R2 = 10
.
Although the suggested optocoupler is not specified for
operation below 5mA, its performance is adequate for
36V temporary low-line voltage where LED current
would then be
≈
2.2mA to 3.7mA. If R7 is set as high as
51k
, optocoupler operation should be verified over
the expected temperature and input voltage range to
ensure suitable operation when LED current
≈
0.9mA for
48V input and
≈
0.7mA for 36V input.
If input transients are expected to momentarily raise the
input voltage to >100V, select an input transient-volt-
age-suppression diode (TVS) to limit maximum voltage
on the MAX5949 to less than 100V. A suitable device is
the Diodes Inc. SMAT70A telecom-specific TVS.
Select Q1 to meet supply voltage, load current, efficien-
cy, and Q1 package power-dissipation requirements:
BV
DSS
≥
100V
I
D(ON)
≥
3 x I
LOAD
DPAK, D
2
PAK, or TO-220AB
The lowest practical R
DS(ON)
, within budget constraints
and with values from 14m
to 540m
, are available at
100V breakdown.
Ensure that the temperature rise of Q1 junction is not
excessive at normal load current for the package select-
ed. Ensure that I
CB
current during voltage transients
does not exceed allowable transient-safe operating-area
limitations. This is determined from the SOA and tran-
sient-thermal-resistance curves in the Q1 manufacturer’s
data sheet.
Example 1:
I
LOAD
= 2.5A, efficiency = 98%, then V
DS
= 0.96V is
acceptable, or R
DS(ON)
≤
384m
at operating temper-
ature is acceptable. An IRL520NS 100V NMOS with
R
DS(ON)
≤
180m
and I
D(ON)
= 10A is available in
D
2
PAK. (A Vishay Siliconix SUD40N10-25 100V NMOS
with R
DS(ON)
≤
25m
and I
D(ON)
= 40A is available in
DPAK, but may be more costly because of a larger die
size.)
Using the IRL520NS, V
DS
≤
0.625V even at +80°C so
efficiency
≥
98.6% at 80°C. P
D
≤
1.56W and junction
temperature rise above case temperature would be 5°C
due to the package
θ
JC
= 3.1°C/W thermal resistance.
Of course, using the SUD40N10-25 would yield an effi-
ciency greater than 99.8% to compensate for the
increased cost.
R
V
I
mA
5
IN NOMINAL
(
≤
LED
7
2
)
≤
=
R
s
C
typically k
(
3
150
2
1
≤
μ
)
C
C
(
C
x
V
V
V
gd
IN MAX
(
GS TH
(
)
GS TH
(
1
2
=
+
)
)
)
C
A x C
μ
I
L
INRUSH
2
45
=
I
x
mV
R
I
or
I
I
x I
INRUSH
SENSE
≤
LOAD
INRUSH
LOAD
CB MIN
(
≤
+
0 8
.
40
0 8
.
)
R
mV
I
SENSE
CB
M
-48V Hot-Swap Controllers
with External R
SENSE
______________________________________________________________________________________
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5949BESA+ | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5949BESA+T | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5949BESA-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5950ETJ | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX5950ETJ+ | 功能描述:電壓模式 PWM 控制器 12V PWM Controller w/Hot-Swap RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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