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ZHCS596B December 2011 – June 2019 AFE030

PRODUCTION DATA.

封裝選項

機械數據 (封裝 | 引腳)

RGZ|48
- MPQF123F

散熱焊盤機械數據 (封裝 | 引腳)

訂購信息

10.4 Circuit Protection

Powerline communications are often located in operating environments that are harsh for electrical components connected to the ac line. Noise or surges from electrical anomalies such as lightning, capacitor bank switching, inductive switching, or other grid fault conditions can damage high-performance integrated circuits if they are not properly protected. The AFE030 can survive even the harshest conditions if several recommendations are followed.

First, dissipate as much of the electrical disturbance before it reaches the AFE030 with a multi-layer approach using metal-oxide varistors (MOVs), transient voltage suppression diodes (TVSs), Schottky diodes, and a Zener diode. Figure 50 shows the recommended strategy for transient overvoltage protection.

AFE030 ai_line_transient_protect_bos588.gif

Figure 50. Transient Overvoltage Protection for AFE030

Note that the high-voltage coupling capacitor must be able to withstand pulses up to the clamping protection provided by the MOV. A metalized polypropylene capacitor, such as the 474MKP275KA from Illinois Capacitor, Inc., is rated for 50 Hz to 60 Hz, 250 VAC to 310 VAC, and can withstand 24 impulses of 2.5 kV.

Table 20 lists several recommended transient protection components.

Table 20. Recommended Transient Protection Devices

	120 VAC, 60 Hz
COMPONENT	DESCRIPTION	MANUFACTURER	MFR PART NO (OR EQUIVALENT)
D1	Zener diode	Diodes, Inc.	1SMB59xxB⁽¹⁾
D2, D3	Schottky diode	Diodes, Inc.	1N5819HW
TVS	Transient voltage suppressor	Diodec Semiconductor	P6SMBJxxC⁽²⁾
MOV	Varistor	LittleFuse	TMOV20RP140E
HV Cap	High-voltage capacitor	Illinois Capacitor, Inc	474MKP275KA⁽³⁾

	240 VAC, 50 Hz
COMPONENT	DESCRIPTION	MANUFACTURER	MFR PART NO (OR EQUIVALENT)
D1	Zener diode	Diodes, Inc.	1SMB59xxB⁽¹⁾
D2, D3	Schottky diode	Diodes, Inc.	1N5819HW
TVS	Transient voltage suppressor	Diodec Semiconductor	P6SMBJxxC⁽²⁾
MOV	Varistor	LittleFuse	TMOV20RP300E
HV Cap	High-voltage capacitor	Illinois Capacitor, Inc	474MKP275KA⁽³⁾

(1) Select the Zener breakdown voltage at the lowest available rating beyond the normal power-supply operating range.

(2) Select the TVS breakdown voltage at or slightly greater than (0.5 × PA_V_S).

(3) A common value for the high-voltage capacitor is 470 nF. Other values may be substituted depending on the requirements of the application. Note that when making a substitution, it is important in terms of reliability that the capacitor be selected from the same familiy or equivalent family of capacitors rated to withstand high-voltage surges.