XRP7714ILB-0X14-F【PDF 15/29 页】IC REG 5OUT BCK/LINEAR 40TQFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录47

11页 12页 13页 14页 [15页]16页 17页 18页 19页

?2011 Exar Corporation

15/29

Rev. 1.1.6

FAULT HANDLING

While the chip is operating there are four different types of fault handling:

" Under Voltage Lockout (UVLO) monitors the input voltage to the chip, and the chip will

shutdown all channels if the voltage drops to critical levels.

" Over Temperature Protection (OTP) monitors the temperature of the chip, and the chip

will shutdown all channels if the temperature rises to critical levels.

" Over Voltage Protection (OVP) monitors the voltage of channel and will shutdown the

channel if it surpasses its voltage threshold.

" Over Current Protection (OCP) monitors the current of a channel, and will shutdown the

channel if it surpasses its current threshold. The channel will be automatically restarted

after a 200ms delay.

Under Voltage Lockout (UVLO)

There are two locations where the under voltage can be sensed: VIN1 and VIN2. The

SET_UVLO_WARN_VINx register that sets the under voltage warning set point condition at 100mV

increments. When the warning threshold is reached, the Host is informed via a GPIO or by reading

the READ_WARN_FLAG register.

The SET_UVLO_TARG_VINx register that controls the under voltage fault set point condition at

100mV increments. This fault condition will be indicated in the READ_FAULT_WARN register.

When an under voltage fault condition occurs (either on VIN1 or VIN2), the fault flag register is set

and all of the XRP7714 outputs are shut down. The measured input voltages can be read back

using the READ_VIN1 or READ_VIN2 register, and both registers have a resolution of 100mV per

LSB. When the UVLO condition clears (voltage rises above the UVLO Warning Threshold), the chip

can be configured to automatically restart.

VIN1

This is a multi-function pin that provides power to both the Standby Linear Regulator and internal

linear regulators to generate VCCA, VDD, and the Standby LDO (LDOUT).

It is also used as a UVLO detection pin. If Vin1 falls below its user programmed limit, all channels

are shut down.

VIN2

VIN2 is required to be tied to VIN1 pin. It can be used as a UVLO detection pin. If VIN2 falls below

its user programmed limit, all channels are shut down.

Temperature Monitoring and Over Temperature Protection (OTP)

" Reading the junction temperature

This register allows the user to read back the temperature of the IC. The temperature is expressed

in Kelvin with a maximum range of 520K, a minimum of 200K, and an LSB of 5 degrees K. The

temperature can be accessed by reading the READ_VTJ register.

" Over Temperature Warning

There are also warning and fault flags that get set in the READ_OVV_UVLO_OVT_FLAG register.

The warning threshold is configurable to 5 or 10 Degrees C below the fault threshold. When the

junction temperature reaches 5 or 10 Degrees C below the user defined set point, the over-

temperature warning bit [OTPW] gets set in the READ_OVV_UVLO_OVT_FLAG register to warn the

user that the IC might go into an over temperature condition (and shutdown all of the regulators).

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式