LM4051-N: LM4051AIM3-ADJ simulation

Allen Du

Prodigy 60 points

Part Number: LM4051-N
Other Parts Discussed in Thread: REF2033

Hi Team,

I am looking for a referrence voltage of 1.65V for op-amp.

I did simulation with LM4051AIM3-ADJ, but when the load current changed, the VREF voltge changed as well.

Could you help have a look.

1. How to get a stable voltage by LM4051AIM3-ADJ, no matter the load current changing.

2. Any other IC soltuion to get fixed 1.65V referrence voltage directly.

Thanks in advance!

over 3 years ago

+1 Shridhar%20More over 3 years ago

TI__Genius 9165 points

Hello Allen,

As V3 signal changes, the VREF signal will either source or sink current. The sudden change of direction in current along with R10 series resistance is cause for the voltage jump.

One way to verify will be reducing or increasing R10 should have an impact on the VREF voltage change amplitude.

Please add a capacitor is simulation on VREF pin and check this addresses the concern observed now.

Other reference to consider will be REF2033. This has 2 outputs. 1.65V output for amplifier bias. The 3.3V reference output can be used as reference to data converters in the system.

Thanks & Regards,

Shridhar.