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參數資料
型號: MAX5963UTL+T
廠商: Maxim Integrated
文件頁數: 18/20頁
文件大小: 291K
描述: IC HOT SWAP DIO ORING CTL 40TQFN
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
類型: 熱交換控制器
應用: FireWire? 應用程序
內部開關:
電源電壓: 7.5 V ~ 76 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 40-WFQFN 裸露焊盤
供應商設備封裝: 40-TQFN-EP(6x6)
包裝: 帶卷 (TR)
FireWire Power Management
The MAX5963 is an excellent solution for FireWire port
control and protection. In a two-port power-sourcing
application, the MAX5963 can route system power to
both ports, or it can allow either port to pass power to
the other port, while blocking reverse current to the sys-
tem power supply.
In these applications, it is important that no loads be
placed on the PS node of the application circuit
because V
PS
is not protected against overcurrent
faults. Loads should be placed at the port connections
OUTA and OUTB instead, as shown in Figure 5.
The fast-off, slow-on input can be used to implement
late VG protection for FireWire ports. In the event that a
FireWire device makes connection with VP prior to VG,
protection diodes in the load device can apply high
voltage to the signal lines, damaging the host PHY.
Connect the FOSO input as shown in Figure 5 to sense
high voltage on the signal lines, and the MAX5963
immediately disconnects until VG is connected.
Transient Protection
If PS or OUT_ experiences a fast transient rise in volt-
age, the drain-to-gate overlap capacitance of GATE1_
and/or GATE2_ FETs may be sufficient to enhance both
of the transistors, allowing current to flow. If the circuit
is subjected to large transients, connect capacitors
from the gate to source across the appropriate MOS-
FET to prevent the overlap capacitance from turning on
the device. This causes the turn-off time of the FETs to
increase due to the additional discharge of the capaci-
tor. Use the minimum capacitor value that prevents
reverse currents from flowing in hot-plug situations.
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
18   ______________________________________________________________________________________
Table 4. FireWire Port Powering and Late V
G
(FOSO) Protection Truth Table
INPUT
OUTPUT
FOSO
ONA
ONB
GATE_A
GATE_B
DESCRIPTION
H
X
X
Off
Off
Late V
G
 event, all ports are off.
L
H
X
On

Enable port A power.
L
L
X
Off

Disable port A power.
L
X
H

On
Enable port B power.
L
X
L

Off
Disable port B power.
L
H
H
On
On
Enable port A, B power and power routing between the
ports.
X = Dont care.
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