Hello,
Sir, i want to ask. I've made 5v to 15v level shifter with using a transistor 2n2222.
I'm using 5v PWM (40 kHz) from microcontroller as an input of the base transistor.
The problem is :
1). The transistor itself, become hot.
I've calculated the transistor dissipation :
When transistor in saturation :
Ib = (Vin - Vbe) / R1 = (5v - 0.65v)/1k = 4.35 mA
And then i get :
Ic = hfe.ib = 10 * 4.35 mA = 43.5 mA
And the power dissipation of the transistor would be :
Vce(sat) * Ic(sat) = 43.5 mA * 0.2v = around 8.7 mW (the maximum dissipation of transistor on datasheet is about 1.8 Watt)
I get Ic(sat) = 0.2v and Vbe = 0.65v from the datasheet of transistor 2n2222.
2). The output only give me 15v DC (i think the output voltage is latching to the voltage supply), not inverting of the PWM. I thought that the output would be such as like this :
And also can you give me a recommendation for making 5v to 15v level shifter ?
I've been thinking to use IR2110 as the level shifter, is that good sir ?
For the problem number 2, can i use this kind of circuit, to avoid the 'latching' problem :
And for the problem number 1, i don't have any solution yet.
Thank you sir for your reply,
Sir, i want to ask. I've made 5v to 15v level shifter with using a transistor 2n2222.
I'm using 5v PWM (40 kHz) from microcontroller as an input of the base transistor.
The problem is :
1). The transistor itself, become hot.
I've calculated the transistor dissipation :
When transistor in saturation :
Ib = (Vin - Vbe) / R1 = (5v - 0.65v)/1k = 4.35 mA
And then i get :
Ic = hfe.ib = 10 * 4.35 mA = 43.5 mA
And the power dissipation of the transistor would be :
Vce(sat) * Ic(sat) = 43.5 mA * 0.2v = around 8.7 mW (the maximum dissipation of transistor on datasheet is about 1.8 Watt)
I get Ic(sat) = 0.2v and Vbe = 0.65v from the datasheet of transistor 2n2222.
2). The output only give me 15v DC (i think the output voltage is latching to the voltage supply), not inverting of the PWM. I thought that the output would be such as like this :
And also can you give me a recommendation for making 5v to 15v level shifter ?
I've been thinking to use IR2110 as the level shifter, is that good sir ?
For the problem number 2, can i use this kind of circuit, to avoid the 'latching' problem :
And for the problem number 1, i don't have any solution yet.
Thank you sir for your reply,