bq24650 evm

Hi Sangah,

What do you mean by performing 2.7 in bq24650 datasheet?

As for MPPSET, you need to modify the resistors R3/R4 from the datasheet schematic to values calculated on page 13 equation 2. For the setting, you need to find what is the max power point from your solar panel datasheet.

Regards,
Steven

i inserted bq24650 evaluation board datasheet 

I'm trying to perform 2.7 in bq24650 evaluation board datasheet in order to test the bq24650evm.

however, i don't have electric load. so i don't performing this test.

so,please give recommendation about alternatives instead of electric load.

I've been using bq24650 evaluation board with my solar panel prototype.

in bq24650 evaluation board, Vmppset is set at 17.8 Vdc from the factory.

so i can't  modify the resistors R3/R4 

is it possible to modify the resistors R3/R4 in bq24650 evaluation board?

bq24650EVM.pdf

Thank you for your reply and sorry for my cheap question.

Sangah,

To test the system load, you can just use a resistor load, or use a decade box to change the resistance. As for battery charging, you will need to use an electronic load or a sourcemeter to force voltage in constant voltage mode.

You will have to modify the resistor values on the EVM based on your application.

Regards,
Steven

hi 

i have a question about p7 2.7.2 in bq24650 evaluation board datasheet i inserted.

i can't observe V(J2(VOUT))=12.6 V ±500 mV 

l connected load1 =10Kohm and load2=10kohm

and when i conducted 2.7.2, board was too hot.

i connected

jp1 : connect 2-3(internal TS)

jp2 : ON

jp3 : connect 1-2(EN TERN_EN)

jp4 : charge enable

2.7.2 Charger Enable and Battery Detection

Connect 2-3 of JP1 (Internal TS); Short JP4 (Charger Enable)

Measure → V(TP(VREF)) = 3.3 V ±200 mV

Measure → V(TP(REGN)) = 6 V ±200 mV

Observe → V(J2(VOUT))=12.6 V ±500 mV     (i measured 5V)

Observe → D4 (/STAT1) OFF, D5 (/STAT2) OFF  (D4 is ON)

Hi Sangah,

Could you repeat test 2.7.2, but remove the 10K Resistor Loads and see what happens?

Also, have you done test 2.7.1?

hi 

when i removed the the 10K Resistor Loads, i meaeured  V(J2(VOUT))=5v and D1 was on.

evaluation board was too hot.

and i had done test 2.7.1 and result was equal to the datasheet 2,7,1.

Disconnect LOAD#1#2. Turn on PS#1.
V(J2(VSYS)) = 21 V ±500 mV
V(J2(VOUT)) = 0 V ±500 mV
V(TP(VREF)) = 3.3 V ±200 mV
V(TP(REGN)) = 0 V ±200 mV

Sangah,

If the D1 indicator is on, that means that the circuit is in a charging state, or is sourcing current, and a lot of it if the board is getting too hot. What all do you have connected at the Vsys, Vout, and PGND nodes of the EVM? You could also double check the soldering if you have made any modifications.

hi

i connected vsys  : 10K Resistor Load

   vout : 10K Resistor Load

   pgnd : gnd

Thank you 

Sangah,

I see, If you refer to Steven's earlier post,  you can force  a voltage at Vout to "simulate" a battery being  present. A resistor load is  fine for Vsys, but you  will need something similar to an E-Load or  Sourcemeter - something that can set a voltage  while sinking the charge current. I  believe  for  the  test you are running - 7.2 - it wants both Vsys  and Vout to  be open circuits.