MC33HB2000 OC flag

[hyjung]

Dear all.

I have some question.

-. When AL = "0" is set, if an OC occurs, will the output (Out A & Out B) be maintained or turned off?

-. OC blanking time is specified only in typ. value.  What is the min.value?
   (Is there any reason not specified?)
   and does the blank time start when the OC flag is set?

-. Short-circuit (SC) shutdown condition
It is specified as ILIM+3A ~ ILIM+8A, and at this time, the ILIM's min ~ max. Is it applicable as a range?
ex) ILIM = 10, ISC_LS is 10.3A ~ 18.3A

Thanks

[guoweisun]

Please help and provide your information then talk about these quesitons:

1: company name /location

2project schedule

3: volume/annual

[hyjung]

Hi guoweisun

Please reply if there is anything confirmed.

Thanks.

[guoweisun]

When set to AL = 0, the Active Current Limit is disabled. The OC will be latched/flagged but does not control the outputs.

The reason for no min and max blanking time specified in the data sheet is due to the fact that blanking time is temperature dependent based on die temperature OTW and TM (Thermal Management) mode.

Blanking time starts when the current exceeds the threshold set by the current limit comparator (active current limit threshold ILIM).

Short-Circuit shutdown min and max specified in the data sheet is appliable as a range. For example: ILIM=10.7A, ISC_LS 13.7A (min) to 18.7A (max).

[hyjung]

Hi guoweisun

Thanks for your reply.

1. It is also mentioned in the datasheet, but what does "does not control the output" mean when OC latch/flag occurs?
For example, if the OC latch/flag is generated when operating in the forward direction, does the output continue to turn the FET on or off in the forward direction?

2. If the blank time is different depending on the temperature, is it possible to provide a graph for each temperature? (does the blank time increase as the temperature rises?)
The customer asked if there was a condition for the blank time to be less than 3us.

Thanks.

[guoweisun]

When AL=0, Active current limit is disabled, no output control means there is no active current limit response meaning no active current limit regulation.

Output will continue to turn the FET on or off in the direction that it is commanded.

However, if the current gets above the short-circuit threshold for the duration of short-circuit filter time tSC the outputs are disabled, and the SPI fault bit is set. Blanking time is set to only two possible times based on Tj less than OTw (32us), or Tj greater than or equal to OTw (256us).

There is no condition for blanking time less than 3us. 

[hyjung]

Hi guoweisun

Thanks for your reply.

In the datasheet, only single layer and four layer thermal resistance are specified.
Is it possible to know the thermal resistance value in two layers under the same conditions?

Thanks.

[guoweisun]

Yes I will reply to you if any update.

[hyjung]

Hi Guoweisun

This is a request for confirmation from the customer. 
I will fill in your request and forward it to you.

1. WT technology / South Korea
2. MP: End of April Y23
3. 300k/yr

Thanks.