参数资料
| 型号： | XRP2528EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL POWER SWITCH XRP2528 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，配电开关（负载开关） |
| 已用 IC / 零件： | XRP2528 |
| 已供物品： | 板 |
| 其它名称： | 1016-1755 |
X R P 2 5 2 7 - X R P 2 5 2 8
S i n g l e / D u a l C h a n n e l A d j u s t a b l e C u r r e n t P o w e r
D i s t r i b u t i o n S w i t c h
Fig. 28: Current Limit Operation (XRP2527):
VIN=5V, Rload = 10 ? , RSET = 330k ?
THEORY OF OPERATION
The XRP2527 and XRP2528 devices are
respectively single and dual channel integrated
high-side power distribution switches with
programmable current limit threshold feature.
They can be used in any self or bus powered
USB applications and are compliant with the
latest USB 3.0 specifications. The reverse
current protection feature prevents current to
flow from OUT to IN when the device is
disabled.
I NPUT & O UTPUT
Placing bulk capacitances of at least 47 μ F and
10 μ F at the input and output pins respectively
reduces power supply transients under heavy
current load conditions.
It is important to place a 1 μ F ceramic bypass
capacitor from IN to GND as close as possible
to the device in order to control supply
transients.
Furthermore, bypassing the output pin with a
0.1 μ F to 1 μ F ceramic capacitor improves the
device response to short-circuit transients.
E RROR F LAG
The error flag signal (FLG X output pin) is an
open-drain output and is pulled low (active
low) upon detection of the following
conditions:
? Over-current condition
? Over-temperature condition
? Under voltage lockout condition
Over-temperature and under voltage lockout
conditions are flagged immediately while the
output over – current condition is reported if
continuously persistent for longer than the
blanking time of 10ms. The blanking time
prevents erroneous reporting of current faults
due to brief output current spikes.
Once activated, the error flag signal remains
low until all fault conditions have been
removed and is independent for each
individual channel.
C URRENT L IMIT
The current limit feature protects the output
MOSFET switches from damages resulting
from undesirable short circuit conditions or
excess inrush current, which is often
encountered during hot plug-in. Upon
detection of overcurrent condition, the output
current is limited to a constant current limit
threshold value and the output voltage is
reduced accordingly. Triggering the current
limit function is signaled by the Error Flag
after 10ms of blanking time period.
The minimum current limit threshold can be
programmed from 300mA to 1A set via an
external resistor at the RSET pin. If RSET pin
is left floating, then the device is set to USB
3.0 current limit setting. For USB 2.0 current
limit setting, the RSET pin must be tied to
VIN. The current limit threshold value is set
using the resistor at RSET pin by the following
equation:
? 2011 Exar Corporation
9/13
Rev. 1.1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP2528IHB-1-F | 功能描述:电源开关 IC - USB DUAL CH USB SWITCH w/ ADJ. CURRENT RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| XRP2528IHBTR-1-F | 功能描述:电源开关 IC - USB DUAL CH USB SWITCH w/ ADJ. CURRENT RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| XRP29302ETB-L | 功能描述:低压差稳压器 - LDO Enable RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| XRP29302ETBTR-L | 功能描述:低压差稳压器 - LDO Enable RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| XRP29302ET-L | 功能描述:低压差稳压器 - LDO Enable RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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