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MCP18480 데이터시트(PDF) 2 Page - Microchip Technology

부품명 MCP18480
상세설명  -48V Hot Swap Controller
PDF  64 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP18480 데이터시트(HTML) 2 Page - Microchip Technology

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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
VPOS
UVTH
UVD
OVTH
VNEG
GATE
VFB
MCP18480
UVHYS
VREFOUT
VREFIN
SENSE
TIMER
RDISCH
ISET
PWRGOOD (1)
DRAINTH
12V
Regulator
12VOUT
5V
Reg.
5VOUT
5VOUT
Latch
Current Limit Timer
ENABLE
RESTART
CL
VPOS
OVO
PWRGOOD
Output Block
VNEG
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 VREFIN pin or level on the VNEG pin) on the ISET pin:
- Connecting the external RISET resistor to VREFIN configures the PWRGOOD pin as active-low
- Connecting the external RISET resistor to VNEG 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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