TND307 Ver la hoja de datos (PDF) - ON Semiconductor
Número de pieza
componentes Descripción
Fabricante
TND307 Datasheet PDF : 8 Pages
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TND307
30 k
3.3 k
10 k
1
2 0.1 mF
3
Vin
AC Comp
4 Ref Filter
5 AC Input
6 FB/SD
7 Loop Comp
8 Pcomp
9 Pmax
Vref
Output 16
IS– 12
Iavg
Iavg fltr
10
11
Ramp
GND
CT Comp
15 14
CT
13
47 k
14 V
1 mF
Freq Cntr
Figure 3. Frequency versus CT
Re: NCP1650/D data sheet, Figure 5
Bias device per the above figure. Install various values of
CT, and measure the frequency at pin 13. Do not measure
directly from pin 14, as the impedance of the measuring
device will cause errors in the reading.
30 k
3.3 k
10 k
1
2 0.1 mF
3
Vin
AC Comp
4 Ref Filter
5 AC Input
6 FB/SD
7 Loop Comp
8 Pcomp
9 Pmax
Vref
Output 16
IS– 12
Iavg
10
11
Iavg fltr
Ramp
GND
CT Comp
15 14
CT
13
47 k
14 V
1 mF
Freq Cntr
Figure 4. Ramp Peak versus Frequency
Re: NCP1650/D data sheet, Figure 6
Bias device per the above figure. Install various values of
CT, and measure the frequency at pin 13. Measure
amplitude at pin 14 with an oscilloscope.
2.5 V
3.3 k
1
2 0.1 mF
3
Vin
AC Comp
4 Ref Filter
5 AC Input
6 FB/SD
7 Loop Comp
8 Pcomp
9 Pmax
Vref
Output 16
IS– 12
Iavg
Iavg fltr
10
11
Ramp
GND
CT Comp
15 14
CT
13
47 k
14 V
1 mF
30 k
0–5 V
3.3 k
10 k
1
2 0.1 mF
3
Vin
AC Comp
4 Ref Filter
5 AC Input
6 FB/SD
7 Loop Comp
8 Pcomp
9 Pmax
Vref
Output 16
IS– 12
Iavg
Iavg fltr
10
11
Ramp
GND
CT Comp
15
14 13
470 pF
47 k
14 V
1 mF
CL
Figure 5. Max Duty Cycle versus Frequency
Re: NCP1650/D data sheet, Figure 7
Figure 6. Drive Rise and Fall Time versus Capacitance
Re: NCP1650/D data sheet, Figure 8
Measure frequency and duty cycle for various values of
CT.
Adjust the voltage on pin 3 for approximately 50% duty
cycle from the output driver. Measure the waveform on pin
16 with an oscilloscope and measure the rise and fall times
at the 10% and 90% levels. Change CL as required.
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