The follower output current and resistance?

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myz_1382761
Level 1
Level 1

I need a voltage 3.5V from cy8c3866.I use DA generated 3.5V, and with a follower to output the voltage. Output voltage is 3.5V when no any load,and voltage will down to 2.7V when drive a resistance 1.8K. The problem is, why follower cann't drive a 1.8K resistance?How much the max current and internal resistance of follower? Thank you.

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1 Solution
EvPa_264126
Level 7
Level 7
500 replies posted 250 replies posted 100 likes received

I repeated this scheme for CY8CKIT - 030 

VDD =4.3V  Vout_1  at P3.7

for R_1=NO   Vout_1 = 3.51

for R_1=1.8K Vout_1 = 3.50

for R_1= 100 Vout_1 = 3.41

IOUT>= 16mA (see datasheet for Opamp)

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1 Reply
EvPa_264126
Level 7
Level 7
500 replies posted 250 replies posted 100 likes received

I repeated this scheme for CY8CKIT - 030 

VDD =4.3V  Vout_1  at P3.7

for R_1=NO   Vout_1 = 3.51

for R_1=1.8K Vout_1 = 3.50

for R_1= 100 Vout_1 = 3.41

IOUT>= 16mA (see datasheet for Opamp)

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