TIDA-00917: Query in ISO5852s auto reset

naga sahitya

Part Number: TIDA-00917
Other Parts Discussed in Thread: ISO5852S, ISO5851

Hiii,

I am trying to implement the auto reset circuit (TIDA-00917, page no.11) in my gate driver. But when i analyzing the circuit i got a doubt. when RDY pin is low , the diode D10 becomes forward biased & C8 will discharge, this will cause a peak current to flow in the diode which is 5/0.2 = 25A , where 0.2ohm is approx diode forward resistance taken from diode datasheet. This current may destroy the device. Please solve my query.

Regards

Nagasahitya

over 5 years ago

0 Pawan Nayak over 5 years ago

TI__Intellectual 2410 points

Hi Nagasahitya,

The peak current through the schottky diode is not going to be so large. A practical implementation is bound to have finite rise and fall times on the RDY pin. The track will have some parasitic inductance and the RDY pin will have some pull down resistance. You can try simulating the circuit in TINA spice and check the peak currents as this is a transient.

Regards,
Pawan

0 naga sahitya over 5 years ago in reply to Pawan Nayak

Intellectual 550 points

can u please provide me the TINA file of ISO5852 , so that i can simulate

0 Pawan Nayak over 5 years ago in reply to naga sahitya

TI__Intellectual 2410 points

Hi Nagasahitya,

You can simulate the auto-restart circuit using discretes and the RDY pin can be modeled using a switching voltage source.

Only PSPICE model of ISO5852S is available. TINA SPICE model is available for ISO5851, you can use this model as it is similar to the ISO5852S

Regards,
Pawan

0 naga sahitya over 5 years ago in reply to Pawan Nayak

Intellectual 550 points

driver.TSCHii,

I have added the auto reset circuit in ISO5851 TINA file . when i am trying to simulate, it is showing an error. Access violation at address 00911894 in module TIN.EXE . Read of address 0000009c. please help me. I have attached the updated TINA file

0 Pawan Nayak over 5 years ago in reply to naga sahitya

TI__Intellectual 2410 points

Hi Nagasahitya,

You can simulate only the auto-reset circuit, use a voltage generator source to model the RDY pin. The entire ISO5851 part is not necessary for simulating the auto-reset circuit.

Regards,
Pawan

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TIDA-00917: Query in ISO5852s auto reset