參數(shù)資料
型號： 73M1822-KEYCHN
廠商： Maxim Integrated Products
文件頁數(shù)： 25/82頁
文件大?。?/td> 0K
描述： BOARD KEYCHAIN 73M1822 42-QFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 1
主要目的： *
嵌入式： *
已用 IC / 零件： *
主要屬性： *
次要屬性： *
已供物品： 板，CD
DS_1x22_017
73M1822/73M1922 Data Sheet
Rev. 1.6
31
4.3
Over-Voltage and EMI Protection
Over-voltage/over-current protection is required to meet worst-case conditions for target countries.
UL1950, EN60950, IEC 60950, ITU-T K.20/K.21 and GR-1089-CORE specifications define the protection
requirements for many countries. A single design can be implemented to meet all these requirements.
Figure 12 shows a recommended protection circuit topology. Fuse (F1) should be rated for 600 V operation
and the bidirectional thyristor (E1) should have a minimum break-over of 275 V and be able to survive a 100
A fast transient. In addition to over-voltage and current protection, the line-interface designer should make
provisions to prevent EMI emissions and susceptibility. Figure 12 also illustrates how L1, L2, C35, C36 and
C42 can provide this suppression. The ferrite beads, L1 and L2, should be capable of passing 200 mA and
have an impedance of 2000
Ω at 100 MHz. C35, C36 and C42 should be 220 pF and rated for a
breakdown voltage greater than the highest isolation voltage that is required for country compatibility. C35
and C36 should be returned to an earth ground. EMI suppression is dependent on the physical design of
the overall circuit and not all the suppression components may be needed in every design and application.
The values shown are typical and should be optimized for a particular design.
R
T
C35
220 pF, 3000 V
C36
220 pF, 3000 V
L1
2000
Ω @ 100 MHz
F1
TR600-150
L2
2000
Ω @ 100 MHz
J1
RJ-11
1
2
3
4
5
6
E1
P3100SBRP
220 pF,
300 V
C42
Figure 12: Suggested Over-voltage Protection and EMI Suppression Circuit
Table 27: Reference Bill of Materials for Figure 12
Reference
Part Description
Source
Example MFR P/N
E1
Bidirectional thyristor, 275V/ 100A
Diodes, Inc.
TB3100H-13-H
F1
150mA, 600V PTC resettable fuse
Bourns
MF-R015/600 or equivalent
L1,L2
2 KΩ @ 100 MHz, 200 mA min, 0805
Steward/TDK
MPZ2012S601A
C36, C35
220 pF, 3000 V
TDK
C4532COG3F221K
C42
220 pF, 300 V
Vishay
VJ1206Y221KXEAT5Z
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