TPS25921 ENUV terminal resistor removing

Hi Nakai-san,

1. Remove R1, R2, R3
2. Connect ENUV pin directly to VIN pin
3. Connect OVP pin to GND
4. If fault indication is not required, connect FLT pin to GND. And R4 can be removed.

Please you provide additional details about the application.

1. Vin min, Vinmax
2. Type of load
3. Minimum and maximum load current
3. Is short circuit protection required?

Regards,
Venkat

Hi Venkata,

Thank you very much for your reply.

I understood except No.4 answer.

Is there any problem if /FLT terminal is floating?
The customer wants to leave the terminal floating.

I answered your question as the follows.
1. 10.8V~15.6V.
2. solenoid valve.
3. 0.4A~0.9A.
4. Yes. The solenoid valve is driven by TI transistor ULN2003.
If the valve is shorted, ULN2003 is broken. The customer wants to protect ULN2003.

Thank you again and best regards,
Kazuya Nakai.

Hi Nakai-san,

No issue in floating the FLT pin. Since eFuse is driving solenoid value, I would recommend additional protections:

1. Output schottky diode: Part number B130-13-F

2. Input TVS diode: Part number SMAJ16A-13-F

Regards,

Venkat

Hi Venkat,

Thank you for the recommendation, DIODES TVS/schotky diode. But it is difficult for our customer to buy DIODES parts.
They can buy those parts from Japanese company, ROHM or SHIN-DENGEN.
ROHM URL:
www.rohm.com/.../

SHIN-DENGEN URL:
www.shindengen.co.jp/.../index.html

If you can find any recommended parts on those URL, could you please tell me the parts.
If not, could you please tell me which parameter we should pay attention for parts selection?

Parameter should be paid attention
For TVS: 1. Breakdown Voltage?
2. Max. Peak Pulse Current?
3. Peak Pulse Power Dissipation?

For Schottky:
1. Forward Voltage Drop?
2. Average Rectified Output Current?
3. Working Peak Reverse Voltage?

Thank you and best regards,
Kazuya Nakai.

Hi Venkat,

Thank you for the recommendation, DIODES TVS and Schottky diode.
But It is difficult for our customer to buy DIODES parts. They can buy ROHM or SHINDENGEN parts.

ROHM URL:
www.rohm.com/.../

SHINDENGEN URL:
www.shindengen.co.jp/.../index.html

If you can find any recommended parts on those URL, could you please tel me the parts?

If not, could you please tell me which parameter we should pay attention?

Parameter should be paid attention.
For TVS:
1. Breakdown Voltage?
2. Max. Peak Pulse Current?
3. Peak Pulse Power Dissipation?

For Schottky:
1. Forward Voltage Drop?
2. DC Blocking Voltage?
3. Average Rectified Output Current?

Thank you and best regards,
Kazuya Nakai.

Hi Rakesh,

Thank you very much for the recommendation.

Could you please tell me your selection points when you selected RSX205L-30TE25 for our reference?

Also I checked TVS of Japanese diode parts company but I couldn't find any TVS to suit the parameters.
If the wire inductance between the power supply for solenoid valve and e-Fuse, TPS25921A is small, can the TVS parameter for selection be changed. Especially, can Max peak pulse current value or Peak pulse power dissipation be reduced?

Thank you again and best regards,
Kazuya Nakai