LME49830 dose not work any body help!

Status
Not open for further replies.
LME49830,2sk1530,2sj201 used.

- Condition -
Mute pin - Gnd
input - Gnd
Power - +-25V

- Problem -
Very high current.
Supply Voltage drop
Dose not adjust BIAS (5V fixed) - AN-1850.pdf, FIGUER 3, J9 connect voltage


Check the wiring was 4-5 times. No problems found.
i need help!
 

Attachments

  • E_P100901001.jpg
    E_P100901001.jpg
    521.8 KB · Views: 268
  • E_P100901002.jpg
    E_P100901002.jpg
    558.2 KB · Views: 242
I like the heatsink and clip on the chip.
Can you give a reference to the pairing?

I do not like all that uninsulated wiring.

First, seek understanding.
My English is very bad.

"Reference to the pairing" What do you mean?
Say easily explained.

Anxiety seems to be wiring.
However, there is no short circuit.
0.8mm tinned wire is used.

First, as I know, gives more information.

MOSFET pair 4 was used.
Is now checking all the MOSFET.

Thanks for your reply.
 
Last edited:
First, check whether there is short-circuit in MOSFET.

Before power on , Rp1 (200R) should be adjusted to the maximum resistance.

More importantly, the MOS transistor and temperature compensation transistor should be installed in the same heat sink above. And to place insulation film.
 
Thanks for reply

Problems found
Wrong resistance. 1.1K to 11K was changed to.

LME49830 pin 12 on the resistance

However, there is oscillation. Both high frequency and low frequency

MOSFET heatsink is very hot.


Please advise.
 
Last edited:
Status
Not open for further replies.