PRABAKARDEVA
Full Member level 2
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Hai,
I am designing a BLDC motor driver by using TLP250 using STM32f402 micro-controller. Now i have been stuck with optocoupler output,after reading hall sensor output i have triggered one high level mosfet and one low level mosfet. But when i read gate voltage there is no such gate triggering voltage so i decided to check respective opto output pins.
These are my questions as well as problems that i'm facing :
1. From controller I m passing 50% of duty cycle value(as well as 95% too) before connecting to pin no 2 of opto it is 1.5V but after connecting to opto it sinks into 0.7V....why???
2. If we try use pull up resistor(220ohms) in between controller o/p to optocoupler input pin no 2 the voltage gets boosted up, when we connect it to pin 2 the problem remains same(0.7V in pin2)
3. If this problem comes due to lack of current from micro controller how to boost up current for opto.
Hai,
I am designing a BLDC motor driver by using TLP250 using STM32f402 micro-controller. Now i have been stuck with optocoupler output,after reading hall sensor output i have triggered one high level mosfet and one low level mosfet. But when i read gate voltage there is no such gate triggering voltage so i decided to check respective opto output pins.
These are my questions as well as problems that i'm facing :
1. From controller I m passing 50% of duty cycle value(as well as 95% too) before connecting to pin no 2 of opto it is 1.5V but after connecting to opto it sinks into 0.7V....why???
2. If we try use pull up resistor(220ohms) in between controller o/p to optocoupler input pin no 2 the voltage gets boosted up, when we connect it to pin 2 the problem remains same(0.7V in pin2)
3. If this problem comes due to lack of current from micro controller how to boost up current for opto.