gate drive for mosfet

Status
Not open for further replies.
M

msyafiq72

Newbie level 3
Joined
Jan 15, 2011
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,312
Actually I am do my project on 3 phase bldc controller.
for gate driver I use HCPL-3180
2.5 Amp Output Current, High Speed, Gate Drive Optocoupler
and for mosfet I used FB180SA10
HEXFET® Power MOSFET
controller pic18f
my problem are:
1. circuit for gate driver (from PIC to HCPL-3180) and
2. circuit for mosfet (from HCPL-3180 to power mosfet)
3. the value of gate resistance
4. the snubber circuit and the value of snubber resistance and capacitance.
 

msyafiq72 said:
1. circuit for gate driver (from PIC to HCPL-3180) and
Click to expand...

There is no gate, it is like an optocoupler, you drive the diode.
you can drive the HCPL-3180 with a resistor directly or you can use use a small transistor, the input diode needs 10-16ma,
the forward voltage of the diode is typically 1.5v (1.2v-1.8v) according to the datasheet.

msyafiq72 said:
3. the value of gate resistance
Click to expand...

The output is specified to 2Amp, i don;t think you need a resistance or you can use a small one a few ohms.

Alex
 

1. I already tried connect the HCPL-3180 like in this figure



but when test this circuit, the gate drive become overheat, and finally it become short between supply Vcc and output Vo
the supply for output is from an adapter 12V, 1A.

2. and if you have the information about design and calculation of snubber circuit, can I know about it.
thank you
 

vo pins 6,7 has no resistive or inductive load applied to it
only RC

so the internal chips transistor will go into thermal runaway

you MUST apply a load or shunt for current

you need even to add a zobial load

say a 1k res to ground ... will be enough

your design is bland and just as the datasheet
never trust a datasheet to show the need for obvious load requirements
 
Last edited:

ok thank you, I will try it later on
the other question is, where I can purchase this HCPL-3180 with just a small purchasing number (about ten only)
can any of you give the link or place to buy it.
now I currently stay at skudai, Johor

Pull up resistor
1. For commutation BLDC I used hall sensors
so it need the pull up resistor at hall sensor output.
so how the connection of the pullup resistor with hall sensor output, and also the value of the resistor
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…