LM337L: Confirm spec

Dillen Chen

Part Number: LM337L
Other Parts Discussed in Thread: TPS7A33

Whether LM337L can meet the following conditions: input voltage -15V output -12V, output peak current 173mA, average current 130mA; .

Thanks

over 2 years ago

Nick Butts over 2 years ago

TI__Mastermind 48245 points

Dillen,

This device is rated for 100mA, so it cannot support this application. TPS7A33 can support it.

Regards,

Nick

Dillen Chen over 2 years ago in reply to Nick Butts

TI__Intellectual 2410 points

It seems current limit is 200mA in DS

Edgar Acosta1 over 2 years ago in reply to Dillen Chen

TI__Genius 12535 points

Hi Dillen,

It is not recommended to operate at or beyond the current limit spec, this will degrade the performance of the device and can affect the reliability of the device as well.

Best,

Edgar Acosta

Dillen Chen over 2 years ago in reply to Edgar Acosta1

TI__Intellectual 2410 points

Sorry, I'm little confused . you said This device is rated for 100mA. But I saw current limit is 200mA in DS. it didn't operate at or beyond the current limit spec

Edgar Acosta1 over 2 years ago in reply to Dillen Chen

TI__Genius 12535 points

Hi Dillen,

Notice that for the current limit spec there is a minimum, typical and maximum value. This would imply that once the device enters current limit, it will limit the current to a value within the given range. Due to process variations and load conditions, this could be i.e 130mA or 150mA, therefore, if peak current is 173mA and average 130mA, then it is possible for the current limit circuit to engage.

The device is rated for 100mA normal operations. Therefore, from the current limit specs, any value above the 100mA to 320mA has the potential to operate at current limit.

Current limit is a protection feature; therefore, we recommend not operating under such conditions.

Best,

Edgar Acosta

Dillen Chen over 2 years ago in reply to Edgar Acosta1

TI__Intellectual 2410 points

Got it, Thanks for your kindly help.

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LM337L: Confirm spec