B
Boki
- Jan 1, 1970
- 0
Dear All,
Here is the requirment.
1. To drive a LED, the current should less than 25uA at turn off state.
( The supply voltage now is about 2.8 ~ 3.3V )
2. At turn on state, the driving current should be larger than 7mA to
avoid low beta of transistor, in this situation, the supply voltage is
about 2.4~2.6V.
The Vf of LED is 1.9 ( somebody's measurment result, no other
informtion ..)
---------------------------------------
Some of my other questions:
1. Why beta will be changed?
2. The Vf of LED is normal ?
Best regards,
Boki.
Here is the requirment.
1. To drive a LED, the current should less than 25uA at turn off state.
( The supply voltage now is about 2.8 ~ 3.3V )
2. At turn on state, the driving current should be larger than 7mA to
avoid low beta of transistor, in this situation, the supply voltage is
about 2.4~2.6V.
The Vf of LED is 1.9 ( somebody's measurment result, no other
informtion ..)
---------------------------------------
Some of my other questions:
1. Why beta will be changed?
2. The Vf of LED is normal ?
Best regards,
Boki.