VIPER50 データシートの表示（PDF） - STMicroelectronics

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VIPER50

SMPS PRIMARY I.C.

STMicroelectronics 

Figure 22: Input Voltage Surges Protection

VIPer50/SP - VIPer50A/ASP

C1

Bulk capacitor

R1

D1

(Optional)

R2

39R

C2

22nF

VDD

-

OSC

13V +

VIPerXX0

DRAIN

COMP SOURCE

Auxilliary winding

ELECTRICAL OVER STRESS RUGGEDNESS

The VIPer may be submitted to electrical over

stress caused by violent input voltage surges or

lightning. Following the enclosed Layout

Considerations chapter rules is the most of the

time sufficient to prevent catastrophic damages,

however in some cases the voltage surges

coupled through the transformer auxiliary winding

can overpass 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 22 can be implemented to improve the

application immunity to such surges.

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