LM5145: UVLO/EN resistance parameters

Hirokazu Takahashi

Part Number: LM5145

Hello Support team,

Could you clarify the meaning of VIN(ON), VIN(OFF), IHYS and VEN at Equation 1 and Equation 2 in datasheet p.18.

Best Regards,
Hirokazu Takahashi

0 Gavin Wang (Zejing) over 5 years ago

Hi Hirokazu,

VIN(ON) is Vin voltage which let the IC on

VIN(OFF) is Vin voltage which which let the IC off

IHYS=internal bias current 10uA

VEN is enable voltage which is larger than 1.2V

Gavin

0 Hirokazu Takahashi over 5 years ago in reply to Gavin Wang (Zejing)

Hello Gavin-san

Thanks for your support.
VIN(ON)：29V
VIN(OFF)：27V
VEN：1.5V

Ruv1 = (29-27)/10uA = 200kΩ
Ruv2 = Ruv1 - {1.5/(29-1.5)}=200kΩ

Is it correct calculation?

Best Regards,
Hirokazu Takahashi

0 Gavin Wang (Zejing) over 5 years ago in reply to Hirokazu Takahashi

Yes, it is right,

Gavin

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