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参数资料
| 型号： | ISL6144 |
| 厂商： | Intersil Corporation |
| 英文描述： | High Voltage ORing MOSFET Controller |
| 中文描述： | 高电压的ORing MOSFET控制器 |
| 文件页数： | 13/14页 |
| 文件大小： | 404K |
| 代理商： | ISL6144 |
8
High Voltage Pass and Clamp
A high voltage pass and clamping circuit prevents the high
output voltage from damaging the comparators in case of
quick drop in VIN. The comparators are running from the 5V
supply between HVREF and VIN. These devices are rated
for 5V and will be damaged if VOUT is allowed to be present
(as the output is powered from other parallel supplies), and
does not fall when VIN is falling. For example, if VIN falls to
30V, VOUT remains at 48V and the differential Voltage
between the “-” and “+” terminals of the comparator would be
18V, exceeding the rating of the devices and causing
permanent damage to the IC.
Fault Detection Block
The fault detection block has two monitoring circuits (refer to
Figure 4):
1. Gate monitoring detects when the GATE < VIN+0.37V
2. VOUT monitoring detects when VIN-0.41V > VOUT
These two outputs are ORed, inverted, level shifted, and
delayed using an internal filter (TFLT )
The following failures can be detected by the fault detection
circuitry:
1. ORing FET off due to dead short in the sourcing supply,
leading to VIN < VOUT
2. Shorted Terminals of the ORing FET
3. Blown fuse in the power path of the sourcing supply
4. Open Gate terminal
5. HVREF UV
The FAULT pin is not latched off and the pull down will shut
off as soon as the fault is removed and the pin becomes high
impedance. Typically, an external pull-up resistor is
connected to an external voltage source (for example 5V,
3.3V) to pull the pin high, an LED can be used to indicate the
presence of a fault.
Application Considerations
ORing MOSFET Selection
Using an ORing MOSFET instead of an ORing diode results
in increased overall power system efficiency as losses
across the ORing elements are reduced. The use of ORing
MOSFETs becomes more important at higher current levels,
as power loss across the traditionally used ORing diode is
very high. The high power dissipation across these diodes
requires special thermal design precautions such as heat
sinks and forced airflow.
For example, in a 48V, 40A (1+1) redundant system with
current sharing, using a Schottky diode as the ORing
(auctioneering) device (refer to Figure 5), the forward
voltage drop is in the 0.4-0.7V range, let us assume it is
0.5V. Power loss across each diode:
Total power loss across the two ORing diodes is 20W.
If a 5m
single MOSFET per feed is used, the Power loss
across each MOSFET is:
Total power loss across the two ORing MOSFETs is 4W.
In case of failure of current sharing scheme, or failure of
DC/DC #1, the full load will be supplied by DC/DC #2. ORing
FIGURE 4. FAULT DETECTION BLOCK
+
-
+
-
0.41V
0.37V
LEVEL SHIFT
DELAY
120s
FAULT
GATE
VIN
VOUT
+
-
+
-
P
loss D1
()
P
loss D2
()
I
OUT
2
--------------- V
F
20A 0.5V
10W
==
=
FIGURE 5. 1+1 REDUNDANT SYSTEM WITH DIODE ORing
+IN
-IN
PR
PC
+OUT
+S
SC
-S
-OUT
DC/DC
#1
Note 8
Figure 16
Rpb1
CIN1
100F
Cd1
220nF
Ccs1
1nF
DC/DC
#2
Rpb2
Ccs2
1nF
36 TO 75 VDC
INPUT BUS 2
INPUT BUS 1
PRIMARY GROUND
+OUT1 = 48V
10
36 TO 75 VDC
VOUT
(40A)
0.5V@ 20A
D1
D2
SECONDARY
+OUT2 = 48V
Note 8
CIN2
100F
Cd2
220nF
GROUND
+IN
-IN
PR
PC
+OUT
+S
SC
-S
-OUT
Figure 16
P
loss M1
()
P
loss M2
()
I
OUT
2
---------------
2
r
DS ON
()
==
P
loss M1
()
20A
()
2
5m
2W
==
(EQ. 4)
ISL6144
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6144_07 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Voltage ORing MOSFET Controller |
| ISL6144EVAL1 | 功能描述:EVALUATION BOARD ISL6144 ORING RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
| ISL6144EVAL1Z | 功能描述:EVALUATION BOARD ISL6144 ORING RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| ISL6144IR | 功能描述:IC CTRLR MOSFET HV ORING 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| ISL6144IR-T | 功能描述:IC CTRLR MOSFET HV ORING 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
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