VIPER50A-E Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

VIPER50A-E

SMPS PRIMARY I.C.

STMicroelectronics 

VIPer50A-E/ASP-E

6 Electrical Over Stress

6 Electrical Over Stress

6.1 Electrical Over Stress Ruggedness

The VIPer may be submitted to electrical over-stress, caused by violent input voltage surges or

lightning. Following the Layout Considerations is sufficient to prevent catastrophic damages

most of the time. However in some cases, the voltage surges coupled through the transformer

auxiliary winding can exceed the VDD pin absolute maximum rating voltage value. Such events

may trigger the VDD internal protection circuitry which could be damaged by the strong

discharge current of the VDD bulk capacitor. The simple RC filter shown in Figure 23 can be

implemented to improve the application immunity to such surges.

Figure 23. Input Voltage Surges Protection

R1

D1

(Optional)

R2

39R

C1

Bulk capacitor

C2

22nF

VDD

-

OSC

13V +

VIPerXX0

DRAIN

COMP SOURCE

Auxilliary winding

21/31

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