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Hi,
The TPS73501 datasheet specifies that for a parallel combination of R1 and R2 equal to 250 kΩ, a feed forward capacitor of value between 3 pF to 1 nF is required. However, the recommended or the minimum value of the resistors R1 and R2 is not specified. Can you please tell me the minimum required value?
Regards,
Prachi
Hi Prachi,
The recommended minimum value will depend on the desired output voltage - the parallel combination of R1 and R2 should = ~250 kOhm.
Some examples, rounded to the nearest 1% standard value:
Vout = ~5.0V, R1= 1M, R2 = 316k
Vout = ~3.3V, R1 = 681k, R2 = 392k
Vout = ~2.85V, R1 = 562k, R2 = 412k
Vout = ~2.5V, R1 = 511k, R2 = 487k
Vout = ~1.8V, R1 = 357k, R2 = 732k
Vout = ~1.5V, R1 = 301k, R2 = 1.24M
Regards,
David
Dear David,
Thank you for your reply. I have another question to follow.
As per the TPS73501 datasheet, smaller value of resistors in the output resistor divider reduce noise. Since, as the parallel combination of R1 and R2 should be close to 250Kohm, the values of the resistors used is large. In this case, there will be larger noise in the output.
Can you please tell me why will the noise increase with the resistors' value and also suggest how this can be taken care of?
Regards,
Prachi