1. - MC33063U + 220 L=100uH Ipk_max=1A Ipk CT S R Q Q2 Q1 6 5 8 7 3 4 1 2
switch
collector
emitter
timing
capacitor
1.25V
reference
regulator
GND
Oscillator
Ipk CT
drive
Sense
VCC
comparator
inverter input + - S R Q Q2 Q1
100 6 5 8 7 3 4 1 2
MC33063U
1N4148
VF=0.6V
Rsc
1Ω2
470p
4.80V
11.83V
100u
10V
33k
Rload
2k2 (5.4mA)
1k2 for 9.9mA
150u
16V
3k9

2. 4.8 Vin 39 mA for 11.83 Vout with load 1k2, without load 3.3 mA
Vout 12V
Iout 10mA
Vin 4.8V
Vsat 1V
Vf 0.6V
L 100uA, 1A
Co 47uF
ton/toff = (Vout + Vf - Vin) / (Vin - Vsat)
= ( ) / ( ) = 2.052
ton/toff = 2
1/f = (ton + toff) = ton* (1 + ton/toff)
CT = ton * 4*10^-5 --> ton = CT/4*10^-5
CT=330p --> ton = 8.25 usec, f = 1 / (ton*(1+ton/toff)) = 1 / (8.25*10^-6*(1+2)) = 40 kHz
CT=470p --> ton = usec, f = 1 / (ton*(1+ton/toff)) = 1 / (11.75*10^-6*(1+2)) = 28 kHz
Ipk = 2 * Iout * (1 + ton/toff) = 2 * 10*10^-3 * (1+2) = 60 mA
Rsc = 0.3 / Ipk(switch) for Rsc=1.2Ω --> Ipk = 0.3/1.2 = 250 mA which is below maximum of 1A for the inductor and above needed 57.5mA
For 60mA Ipk current Rsc = 0.3/60*10^-3 = 5 Ohm
CT=470p, Ipk_switch=60mA, L=xx uH
Lmin = ton_max * (Vin - Vsat) / Ipk_switch = 11.75*10^-6 * ( ) / 60*10^-3 = 744 uH
CT=470p, Ipk_switch=xx mA, L=100 uH
Ipk_switch = ton_max * (Vin - Vsat) / L = 11.75*10^-6 * ( ) /100*10^-6 = 447 mA
CT=270p --> ton = CT / 4*10^-5 = 6.75 usec
Ipk_switch = ton_max * (Vin - Vsat) / L = 6.75*10^-6 * ( ) /100*10^-6 = 260 mA
f = 1 / (ton*(1+ton/toff)) = 1 / (6.75*10^-6*( )) = 52 kHz
Co = (9 * Iout * ton)/ Vripple (pp) --> Vripple(pp) = (9 * Iout * ton)/ Co = 9*10mA*12usec/47u = 23 mV
diode 1N4148, CT 470p :
4.8 Vin 39 mA for Vout with load 1k2, without load 3.3 mA

3. pcb 16x5 front-side 100u 25V MC33063U 100uH 100u 10V +12V out GND +5VA
220
1Ω2
33k
470p
100u
10V
3k9
elco’s aan andere kant IC maakt verbindingen korter
+12V
out
GND
+5V in

4. pcb 16x5 back-side 100uH 100u 10V 25V +5V in +12V out GND MC33063U
1Ω2
220
3k9
33k
1N4148 A
470p
100uH
100u
10V
25V
+5V in
+12V
out
GND
MC33063U
elco’s aan andere kant IC maakt verbindingen korter

5. pcb 13x8 front-side +5V in 100uH MC33063U 100uF 25V + +12V out GND
220
1Ω2
3k9
100uF
10V
MC33063U
33k
100uF
25V +
470p A
1N4148
+12V
out
GND

6. pcb 13x8 back-side +5V in 100uH MC33063U 100uF 25V + +12V GND out 10V
1Ω2
220
3k9 A
1N4148
470p
MC33063U
100uF
25V +
33k
10V

7. USB MIC +5V +5V +12V GND 0V GND YELLOW mic BLUE gnd GREEN 12Vin
out
GND
USB 0V
GND
YELLOW mic
MIC
BLUE gnd
GREEN 12Vin
RED ptt
red, right
USB plug
white, left
+5V
shield
3.5mm 0V
green
red
+12Vout
+5V in
mic cable
PCB
gnd
yellow
blue
white
gnd
connect to 3,5mm plug