TPS61185 IFB

Logan Lin

Intellectual 340 points

Other Parts Discussed in Thread: TPS61185

HI Sirs:

Our customer change backlight LED to this type, which seams like 1 string but need 175mA,

Can I connect IFB1~IFB8 together then connect to K(-)?

cid:046153308@09112016-10E4

over 8 years ago

0 Milo Kim over 8 years ago

TI__Prodigy 320 points

Hi Logan,

I can't see the schematics, could you upload it again?

Best regards,
Milo

0 Logan Lin over 8 years ago in reply to Milo Kim

Intellectual 340 points

HI Kim:

0 Milo Kim over 8 years ago in reply to Logan Lin

TI__Prodigy 320 points

Max Ifb is 25mA for each current sink, so it seems not supportable.

0 Logan Lin over 8 years ago in reply to Milo Kim

Intellectual 340 points

HI Kim:

From customer's schematic, so I can't connect IFB1~IFB8 together to support 175mA?

0 Milo Kim over 8 years ago in reply to Logan Lin

TI__Prodigy 320 points

Hi Logan,

I think it's OK because TPS61185 supports up to 200mA (200 = 8 x 25 mA) but need to do double-check.

To support 175mA, max IFB of each channel should be 22mA (22 = 175 / 8). IFB can be calculated from the equation below. It depends on the value of RISET. Please check this value to get the IFB value.

0 Logan Lin over 8 years ago in reply to Milo Kim

Intellectual 340 points

HI Kim:
thanks for your reply,
totaly undersdand

Power management

Power management forum

TPS61185 IFB