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THVD1450: Layout example missing resistors?

Part Number: THVD1450
Other Parts Discussed in Thread: THVD1520

Hello, all

 

I have a question about THVD1450 design example and layout example.

In the datasheet, there are two pulse-proof resistors in Figure 37.

On the other hand, Figure 40 doesn’t have those pulse-proof resistors and I wander why.

 

I checked other datasheets and found that the datasheet of THVD15xx is similar to THVD14xx, but THVD1520 has pulse-proof resistors in both its design example (Figure 21) and layout example (Figure 24).

I assumed those resistors were simply omitted in the datasheet of THVD14xx and THVD15xx because those are not always necessary.

Is my understanding correct?

 

 

Sincerely,

Kurumi Hasegawa