The voltage is high at 12V, while the output is at 5V.
The larger the difference, the more the energy is dissipated as heat.
This observation is quite typical.
If you want lower heat, try a dc-dc converter.
**broken link removed**
Hi, how to check check current consumption of DSL router?
I have got ammeter.
On router nothing written as it is cheap router. Only voltage given as 5v DC.
Added after 5 minutes:
siongboon said:
The voltage is high at 12V, while the output is at 5V.
The larger the difference, the more the energy is dissipated as heat.
This observation is quite typical.
Yes! So my question is why 7805 get hot only when I connect to router but not IC (voltage drop by 7805 is (12 - 5) V in both cases!) - main reason I ask question.
Dear tellMeDaBasix!
Power 7805 dissipation is
P = Vdrop * I, where Vdrop - voltage that drops across 7805 and is equal 12 - 5 = 7V;
I - current through 7805.
Consequently P = 7 * I.
tellMeDaBasix said:
Hi, how to check check current consumption of DSL router?
Yes! So my question is why 7805 get hot only when I connect to router but not IC (voltage drop by 7805 is (12 - 5) V in both cases!) - main reason I ask question.
I don't know who wrote this,... but it works and it is very handy. **broken link removed**
the cooool thing is you get to see how changing a parameter changes the parts.
p.s. i start with 10mV ripple and 40kHz
I don't know who wrote this,... but it works and it is very handy. **broken link removed**
the cooool thing is you get to see how changing a parameter changes the parts.
p.s. i start with 10mV ripple and 40kHz