Announcements

From sunburn to sun earn – we’ve got the power! Watch our #poweringgreen videos now.

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
Andy_C123
Level 2
Level 2
10 replies posted 10 sign-ins 5 replies posted

I'm using IR38060 on my board, and it burns sometimes but don't know what causes it.
I've tested some cases, but couldn't figure out the reason.

when the IC burend the fuse in the input line got brown.
So I thought over input voltage might cause the problem at first, and tested to see what happens when the over voltage comes in
and the result was: over voltage(30V) input -> IR38060 OVP works and not burned

the other option that I thought was problem with the load that uses output voltage.
I didn't tested the output voltage part because it seems to be too dangerous

these are power specification and the pins that are shorted to the ground after the IC burned
1. Vin: 18V / Vout: 12V
2. PVIN(pin# 1), V1V8(pin# 20), VCC(pin# 22), SW(pin# 24)

I would really appriciate your help
thank you

0 Likes
1 Solution
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hello @Andy_C123 ,

The maximum recommended operating range is 16V given switch node does not exceed 25V.

If you operate at 18V the part might fail due to the switch node spike during the operation of the part.

It is usually recommended to use 1 ohm at RBOOT for PVin>12V, but it should not cause any failure if you are using 0 ohm instead of 1 ohm.

We request you provide below details:

  • Board file of the PCB
  • Screenshot of the status window from the GUI of the damaged parts (Refer to the screenshot below)

Nishanth_1-1698905213699.png

 

  • Read the temperature from the GUI of the damaged parts (Refer to the screenshot below)

Nishanth_0-1698905042703.png

Regards,

Nishanth

 

 

 

View solution in original post

0 Likes
11 Replies
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hello @Andy_C123 ,

Thank you for contributing to the Infineon community.

We are analyzing your issue.

Request you to provide schematic and full specification.

What is the operating load current during the failure? 

Are you operating the part in analog mode or digital mode?

Max. recommended input bus voltage is 16V provided the switch node must not exceed 25V.

Nishanth_0-1697787805005.png

Kindly share the switch node waveform if possible?

Regards,

Nishanth

0 Likes
lock attach
Attachments are accessible only for community members.

Thank you for your help

I attached the schematic below and the specifications are

1. PVin: 18V, RS+(pin# 10): Same node as DPS_CH2_FORCE

2. load current: it is a controller and the load current is not constant, but it uses max current of 2.5A

3. The IC is operating in digital mode

4. switch node wave form is captured with AC coupling mode 

Lastly, as you mentioned above, when I used 30V as an input voltage, I checked the OVP worked and chip wasn't burned

Thank you

0 Likes
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hello @Andy_C123 ,

Thank you for the data.

Kindly capture the switch node waveform in DC coupling at 16V and 18V input voltage as shown on page 6 of the  USER GUIDE FOR IR38060 EVALUATION BOARD.

Regards,

Nishanth

 

0 Likes
lock attach
Attachments are accessible only for community members.

I attached switch node waveform with 18V input and 12V output with different load.

These signals were captured when the board was working properly. 

currently I am not able to provide 16V input information. 

 

Thank You

0 Likes
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hello @Andy_C123 ,

Kindly provide the following data:

  1. Share the waveform of the switch node without limiting the bandwidth in the CRO. Capture the switch node waveform between pin 24 and pin 23.
  2. Share the pictures of the burnt part if possible.
  3. Can you measure the temperature of the part when it is failing?
  4. If possible can you capture the Switch node, Vout, and Vin during the fault?

Regards,

Nishanth

0 Likes
lock attach
Attachments are accessible only for community members.

Thank you for your reply.

I have some questions before I capture the waveform

1. Share the waveform of the switch node without limiting the bandwidth in the CRO. Capture the switch node waveform between pin 24 and pin 23.

    - I do not understand what the CRO means. Can you please explain what the CRO stands for and what it means? Also, I can only take capture waveform of normal IR38060 on my board. Is that what you need? 

2. Share the pictures of the burnt part if possible.

    - I attached the picture below

3. Can you measure the temperature of the part when it is failing?

    - Sorry, It happens randomly and not very often. it is very hard to capture the exact moment. Therefore, the waveform that I am sharing you is when the IC is working properly

4. If possible can you capture the Switch node, Vout, and Vin during the fault?

    - Same reason as question#3. 

0 Likes
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hello @Andy_C123 ,

I am referring to the scope that you use to capture the switch node waveform.

Kindly share the pictures of the bottom side of the IC to identify any burnt marks on the pins.

Regards,

Nishanth

 

0 Likes
Andy_C123
Level 2
Level 2
10 replies posted 10 sign-ins 5 replies posted

The waveform that I attached in the previous reply was capture image without bandwidth limitation.

And, bottom side of the IC looks just same as normal.

0 Likes

I have additional questions to ask.

1. Is it okay to use 18V for Vin and PVin? 

According to the IR38060 datasheet, it is recommended to use 16V max for Vin and PVin eventhough absolute maximum ratings allows 25V for both input. 

I believe using 18V won't cause any critical problem, but I want to hear your opinion on that.

2. In the Pin Descriptions part in the datasheet, it says "For applications in which PVin>12V, the value of the series resistor should be chosen to be 1 ohm.". However, I am using 0ohm instead of 1ohm. Whould it also cause problems related to IC burnning issue?

0 Likes

The resistance between PVIN and SW of each IC is different.

Burnt PVIN & SW IC resistance : 

1. 159 ohm

2. 7ohm

3. open

0 Likes
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hello @Andy_C123 ,

The maximum recommended operating range is 16V given switch node does not exceed 25V.

If you operate at 18V the part might fail due to the switch node spike during the operation of the part.

It is usually recommended to use 1 ohm at RBOOT for PVin>12V, but it should not cause any failure if you are using 0 ohm instead of 1 ohm.

We request you provide below details:

  • Board file of the PCB
  • Screenshot of the status window from the GUI of the damaged parts (Refer to the screenshot below)

Nishanth_1-1698905213699.png

 

  • Read the temperature from the GUI of the damaged parts (Refer to the screenshot below)

Nishanth_0-1698905042703.png

Regards,

Nishanth

 

 

 

0 Likes