參數(shù)資料
型號: MAX5949BESA+T
廠商: Maxim Integrated
文件頁數(shù): 16/18頁
文件大?。?/td> 186K
描述: IC CNTRLR HOT SWAP 8-SOIC
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 2,500
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開關(guān):
電源電壓: -20 V ~ -80 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 帶卷 (TR)
If I
CB
is set to twice I
LOAD
, or 5A, V
DS
momentarily dou-
bles to d1.25V. If C
OUT
= 4000礔, transient-line input
voltage is 36V, and the 5A charging-current pulse is:
Entering the data sheet transient-thermal-resistance
curves at 1ms provides a ?/DIV>
JC
= 0.9癈/W. P
D
= 6.25W,
so t
JC
= 5.6癈. Clearly, this is not a problem.
Example 2:
I
LOAD
= 10A, efficiency = 98%, allowing V
DS
= 0.96V
but R
DS(ON)
d 96m&. An IRF530 in a D
2
PAK exhibits
R
DS(ON)
d 90m& at +25癈 and d 135m& at +80癈.
Power dissipation is 9.6W at +25癈 or 14.4W at +80癈.
Junction-to-case thermal resistance is 1.9W/癈, so the
junction-temperature rise would be approximately 5癈
above the +25癈 case temperature. For higher efficien-
cy, consider IRL540NS with R
DS(ON)
d 44m&. This
allows ?= 99%, P
D
d 4.4W, and T
JC
= +4癈 (?/DIV>
JC
=
1.1癈/W) at +25癈.
Thermal calculations for the transient condition yield
I
CB
= 20A, V
DS
= 1.8V, t = 0.5ms, transient ?/DIV>
JC
=
0.12癈/W, P
D
= 36W and t
JC
= 4.3癈.
t
F x
V
A
ms
   
.
   
=
=
4000
1 25
5
1
?/DIV>
-48V Hot-Swap Controllers
with External R
SENSE
16   ______________________________________________________________________________________
SENSE RESISTOR
HIGH-CURRENT PATH
MAX5949A
MAX5949B
SENSE V
EE
Figure 16. Recommended Layout for Kelvin-Sensing Current
Through Sense Resistor
Selector Guide
PART
PWRGD POLARITY
FAULT MANAGEMENT
MAX5949AESA
Active low (PWRGD)
Latched
MAX5949BESA
Active high (PWRGD)
Latched
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