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| 型号： | 73M2901CE-EVM-WW |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/30页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 73M2901CE WORLDWIDE |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | * |
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73M2901CE Demo Board User Manual
UM_2901CE_026
If TVS devices are also provided on the Tip and Ring lines to earth ground, the voltage rating for the
Tip/Ring capacitors only needs to be able to withstand the maximum TVS clamping voltage. These and
the TVS devices must be removed during the isolation voltage certification tests to prevent triggering the
TVS devices or damaging the capacitors.
Over voltage and current protection are required for a reliable design that will survive the real-world
conditions that are encountered in the field. Nearly all certifying bodies have specifications for the severe
conditions that can occur due to lightning, static discharge, and even voltage cross to power mains. In
some cases these minimums are not adequate to survive some common fault conditions or ignore other
conditions that would seem to be less severe, but actually can present more stress to the design, so
many equipment providers will have even higher level or additional requirements not specified by the
certifying bodies.
For example, the minimum isolation voltage required for the telecom transformers is 2 kV, but lightning
strikes near power and telephone lines often far exceed these levels. For these reasons, some
customers require 6kV or more isolation. Protection from the telephone network connection is usually
provided to prevent over voltage and over current conditions from causing the product to fail. The PTC
(Positive Temperature Coefficient) fuse (F1) and thyristor Transient Voltage Suppressor or TVS (E1)
provide this protection on our demo boards. The devices we chose are parts that meet the minimums
required for UL 60950 and EN-60950, which have the most stringent requirements of the commonly used
standards. The 73M2901 designs are fully functional after the surge and power cross testing has been
performed, even though this is not a requirement to pass, (the requirement for off hook is that it not catch
fire). The following tables show the recommended components to meet various certification
requirements. The PTC fuses listed are through-hole mounted, but surface mount is also available for
most types. There are also different initial “ON” resistance versions that primarily affect the cost; the
lower the initial resistance, the higher the cost.
There are also single fault telecom fuses that are designed to be used in these applications, but they
must be replaced if they are triggered. The cost of these is about the same or more compared to the PTC
types, so there is little advantage to using them in most cases.
Table 17: Recommended PTC Fuses for CPE Applications
Manufacturer
Bourns
Thinking Electronic Ind. Co.
Tyco (Raychem)
Part Number
MF-R015/600
MF-RX012/250
KRT6000015xxx
KRT2500012xxx
TRF600-150
TRF250-120x
Voltage/Current Rating
600V, 150mA
250V, 120mA
600V, 150mA
250V, 120mA
600V, 150mA
250V, 120mA
Specification
TIA-968-A, UL60950
ITU-T K.20/21/45
TIA-968-A, UL60950
ITU-T K.20/21/45
TIA-968-A, UL60950
ITU-T K.20/21/45
The TVS is important because large voltages can damage the DAA if the DAA transistor switches’ voltage
ratings are exceeded. The TVS works in conjunction with the PTC fuse by going into a low impedance
state when the TVS are triggered, which then causes the fuse to go to a high impedance until the fault
condition is cleared. This prevents the TVS from having to dissipate large amounts of energy if there is a
persistent high voltage fault. The TVS will also be triggered for short duration surges, but this will usually
not trigger the fuse since it may take seconds for the fuse to go to the high impedance mode, depending
on the current through it. In any case, these components work as a “team” to protect the DAA circuitry.
26
Rev. 1.5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 73M2901CE-IGV/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IGVR/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IM/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IM/F1 | 功能描述:电信线路管理 IC RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IMR/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
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