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參數資料
型號: MCP18480T-I/SS
廠商: Microchip Technology
文件頁數: 2/64頁
文件大?。?/td> 871K
描述: IC HOT SWAP CTRLR -48V 20SSOP
標準包裝: 1,600
類型: 熱交換控制器
應用: IP 電話,LAN 網絡供電,網絡路由器和交換機
內部開關:
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
供應商設備封裝: 20-SSOP
包裝: 帶卷 (TR)
MCP18480
DS20091B-page 2
?2003 Microchip Technology Inc.
Internal comparators are incorporated to add hystere-
sis for adjusting the Undervoltage Lockout (UVLO)
threshold. The external N-channel MOSFET is turned
on when the input is below the user-programmable,
Overvoltage    threshold    and    above    the    user-
programmable, Undervoltage threshold.
The PWRGOOD pin indicates the status of the
MCP18480 and is active when the device has com-
pleted power-up and the system is not in an Undervolt-
age, Overvoltage or current-limit condition.
PWRGOOD can be externally configured to either
active-high or active-low to accommodate external cir-
cuitry (power supplies) that have either enabling logic.
A block diagram of the MCP18480 is shown below.
MCP18480 Block Diagram
V
POS
 
UV
TH
UV
D
OV
TH
V
NEG
GATE
V
FB
MCP18480
UV
HYS
V
REFOUT
V
REFIN
SENSE
TIMER
R
DISCH
 
I
SET
PWRGOOD
(1)
 
DRAIN
TH
 
12V
Regulator
12V
OUT
 
5V
Reg.
5V
OUT
 
5V
OUT
Latch
Current Limit Timer
ENABLE
RESTART
CL
V
POS
OVO
PWRGOOD
Output Block
V
NEG
 
BIAS
Undervoltage
Overvoltage
Current Limit
GATE
Drive
Timer
FET Good
Circuit Breaker
SENSE
Internal
Bias
Generation
Note  1:   The PWRGOOD output pin can be either active-high or active-low. This polarity is determined by the
voltage (either the level on the V
REFIN
 pin or level on the V
NEG
 pin) on the I
SET
 pin:
-  Connecting the external R
ISET
 resistor to V
REFIN
 configures the PWRGOOD pin as active-low
-  Connecting the external R
ISET
 resistor to V
NEG
 configures the PWRGOOD pin as active-high
(Section 6.8.3)
(Section 6.8.8)
(Section 6.8.2)
(Section 6.8.1)
(Section 6.8.4)
(Section 6.8.9)
(Section 6.8.5)
(Section
6.8.6)
(Section 6.8.7)
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