TLV61220: Tuning the output current DC to DC booster

hi Jasper Li,

The input of TLV61220 connected with energy harvesting module,

if it doesnt connect to the load, i got the voltage 3V as expected.

the output of TLV61220 drop once i connect it to the load (MCU).

so in this case, i need to increase the current and keep the voltage at 3V.

Thank you.

Jasper Li said:

could you measure the waveform of VIN and VOUT once connect the load? i'm thinking maybe the input voltage is too low after adding load

Here is the waveform,

i give load 100kohm and the R1=1Mohm R2=200kohm

the yellow = input, blue = output. 

if I keep the ratio of R1 and R2 but i decrease the resistor, is there any effect on Output Current or Voltage?

thank you

Hi Jasper Li,

Thank you for your answer.

The Energy Harvesting Module (EH) is placed before DC booster, and There is MCU after DC booster

When i try the EH without DC Booster it seems the voltage is able to increase up to 3V.

If i connect the DC booster and MCU, the Input and Output of DC booster looks like the picture below.

Yellow is the input (After EH) and Blue is the output of DC booster.

Is there any effect of the input capacitor?

Thank you