SN65HVD1781: SN65HVD1781DR Equivalent Circuit question

James Su5

Expert 1340 points

Part Number: SN65HVD1781
Other Parts Discussed in Thread: SN65HVD78

Customer need to know red frame Equivalent Circuit for solve current fail Issue.

over 7 years ago

0 Hao L over 7 years ago

TI__Mastermind 25705 points

James,
You can refer to SN65HVD78 for the equivalent input schematic. If you need, please let me know the detail of current fail issue. I can help the debug.
Regards,
Hao

0 James Su5 over 7 years ago in reply to Hao L

Expert 1340 points

Hi Hao,

CTMR like to know below pic 4*MOSFET Rds and Zener Vf value, thanks !

B/R James Su

0 Hao L over 7 years ago in reply to James Su5

TI__Mastermind 25705 points

James,

The Rd is about 20Ohm nominal, Vf about 0.8V. The value could change with the conditions, such as voltage, temperature.

Regards,

Hao

0 James Su5 over 7 years ago in reply to Hao L

Expert 1340 points

Hi Hao,

CTMR like to know all resistance value, thanks !

B/R James Su

0 Hao L over 7 years ago in reply to James Su5

TI__Mastermind 25705 points

James,

These are the typical resistor value for reference.
R1 = 135kOhm, R2 = 40kOhm, R3 = 24kOhm.

Please let me know if you get more questions.
Regards,
Hao

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SN65HVD1781: SN65HVD1781DR Equivalent Circuit question