letters109
Newly Enlightened
- Joined
- Mar 10, 2017
- Messages
- 4
Hello~Friends,how are you today? 
I am not so good because I met some problems when I am doing my project. So here I am to ask you for help.
Let me state the problems clearly.There is a display board which need to control multi-LEDs ,I would like to use the micro-controller to drive 74HC595 and drive MOS to control LEDs by IO of 74HC595 (If I use one MOS to control four LEDs ,the resistance of every LED is 200ohm). After I switch them on current, I found that the output IO of 74HC595 is right,but all LEDs are opening! Then I review the circuit I found the resistance between source and drain of MOS is 193k, maybe the MOS is broken and can't help the switches.The MOS I used is SI2306 . This is the datasheet of SI2306. The current of four LEDs may no exceed the range of MOS.I don't know what it occurred? If i would like to use one MOS to control multi-LEDs, how should I design my circuit?
Your help will be appreciated.
I am not so good because I met some problems when I am doing my project. So here I am to ask you for help.
Let me state the problems clearly.There is a display board which need to control multi-LEDs ,I would like to use the micro-controller to drive 74HC595 and drive MOS to control LEDs by IO of 74HC595 (If I use one MOS to control four LEDs ,the resistance of every LED is 200ohm). After I switch them on current, I found that the output IO of 74HC595 is right,but all LEDs are opening! Then I review the circuit I found the resistance between source and drain of MOS is 193k, maybe the MOS is broken and can't help the switches.The MOS I used is SI2306 . This is the datasheet of SI2306. The current of four LEDs may no exceed the range of MOS.I don't know what it occurred? If i would like to use one MOS to control multi-LEDs, how should I design my circuit?
Your help will be appreciated.
