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参数资料
| 型号： | ISL6118LIB-T |
| 厂商： | INTERSIL CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Dual Power Supply Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 9/10页 |
| 文件大小： | 454K |
| 代理商： | ISL6118LIB-T |
9
Implementing Autoreset on the ISL6118H
Hot Swap Controllers
Abstract
In applications where the cost, complexity or requirement for
a system controller is avoided and an autonomous power
control function is desired, a device that can monitor and
protect against excessive current failures is needed. This
shows how to implement such an autonomous controller
using the ISL6118HIB. This application works only with the
‘H’ version of these devices. The ‘H’ version refers to the
enable function being asserted upon a high input.
Introduction
The ISL6118, ISL6119 and ISL6121 are all 2.5V to 5V power
supply controllers, each having a different level of current
regulation (CR). The ISL6118 and ISL6119 have 2
independent controllers with CR levels of 0.6A and 1.0A
respectively whereas the ISL6121 is a single supply
controller with a 2A CR level. Each of these devices features
integrated power switch(es) for power control. Each switch
is driven by a constant current source giving a controlled
ramp up of the output voltage. This provides a soft start
turn-on eliminating bus voltage drooping caused by in-rush
current while charging heavy load capacitances. The
independent enabling inputs and fault reporting outputs for
each channel are available and necessary for the
autonomous autoreset application.
The undervoltage (UV) feature prevents turn-on of the
outputs unless the ENABLE pin and VIN are >2.5V. During
initial turn-on the ISL6118 prevents fault reporting by
blanking the fault signal. Rising and falling outputs are
current-limited voltage ramps so that both the inrush current
and voltage slew rate are limited, independent of load. This
reduces supply droop due to surge and eliminates the need
for external EMI filters. During operation, once an OC
condition is detected the appropriate output is current limited
to the appropriate level for 10ms to allow transient conditions
to pass. If still in current limit after the current limit period has
elapsed, the output is latched off and the fault is reported by
pulling the corresponding FAULT low. The FAULT signal is
latched low until reset by the ENABLE signal being de-
asserted at which time the FAULT signal will clear.
It is this described sequence of events that allows for the
autoreset function to be implemented in a cost efficient
manner requiring the addition of only an RC network per
channel to the typical application.
Figure 15 illustrates the RC network needed with suggested
component values and the configuration of the relevant pins
for each autoreset channel.
Description of Operation
Initially as voltage is applied to VIN, the pull up resistor (Rpu)
provides for pull up to VIN on both the ENABLE pin asserting
the output once VIN > 2.5V and on the FLTn pin. Once turned
on and an overcurrent (OC) condition occurs the IC provides
CR protection for 10ms and then the FLTn pin pulls low through
Rpu and also pulling the ENABLE low thus resetting the device
fault condition. At this time the Rpu charges the cap and the
voltage on the ENABLE/FLTn node rises until the ENABLE >
2.0 and the output is asserted on once again. This automatic
reset cycle will continue until the OC fault no longer exists on
the output. After several seconds in this mode of operation the
IC thermal protection invokes adjusting the timing of the on-off
cycle to prevent excessive thermal dissipation in the power
switch protecting itself and surrounding circuitry. See Figure 16
for operation waveform.
.
Applications
USB
2.5V to 5V up to 10W power port protection
FIGURE 15.
VIN
ENABLE
FLTn
GND
ISL6118H
Rpu = 2K
C = 0.1μF
FIGURE 16. AUTO RESET OPERATION
IOUT 1A/DIV
VOUT 2V/DIV
VIN/FLTn 5V/DIV
0A
0V
4ms/DIV
ISL6118
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6118LIBZA | Dual Power Supply Controller |
| ISL6118LIBZA-T | Dual Power Supply Controller |
| ISL6AHPEVAL1 | Dual Power Supply Controller |
| ISL6AHPEVAL1-T | Dual Power Supply Controller |
| ISL6118HIB | Dual Power Supply Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6118LIBZA | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Power Supply Controller |
| ISL6118LIBZA-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Power Supply Controller |
| ISL6119 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:USB Dual Port Power Supply Controller |
| ISL6119EVAL1 | 功能描述:EVALUATION PLATFORM ISL6119 RoHS:否 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 |
| ISL6119EVAL1-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:USB Dual Port Power Supply Controller |
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