TND307

http://onsemi.com

5

Figure 15. Voltage Error Amplifier Gain

Re: NCP1650/D data sheet, Figure 21

FB/SD

AC Input

Loop Comp

AC Comp

Ref Filter

Output

GND

Ramp

Comp

6

5

7

3

4

8

9

47 k

0.1

mF

3.3 k

0–5 V

15

14

13

1

mF

14 V

16

12

10

11

12

470 pF

V

V

1.5 V

1 k

Figure 16. Power Error Amplifier Gain

Re: NCP1650/D data sheet, Figure 22

FB/SD

AC Input

AC Comp

Ref Filter

Loop Comp

Output

GND

Ramp

Comp

9

5

8

3

4

7

6

47 k

0.1

mF

3.3 k

0–5 V

15

14

13

1

mF

14 V

16

12

10

11

12

470 pF

V

V

1.5 V

1 k

Energize unit by applying 14 volt supply. Using a

precision supply with resolution of 1 mV or less, adjust the

voltage at pin 6 for zero current out of pin 7. The voltage at

pin 6 will be the effective 4.0 V reference voltage.

Energize unit by applying 14 volt supply. Using a

precision supply with resolution of 1 mV or less, adjust the

voltage at pin 9 for zero current out of pin 8. The voltage at

pin 9 will be the effective 2.5 V reference voltage.

Re: NCP1650/D data sheet, Figure 23

AC Comp

Ref Filter

AC Input

FB/SD

Loop Comp

Output

GND

Ramp

Comp

3

4

5

6

7

8

9

47 k

0.1

mF

3.3 k

15

14

13

1

mF

16

12

10

11

12

1.5 V

A

V

1 nF

AC Comp

Ref Filter

AC Input

FB/SD

Loop Comp

Output

GND

Ramp

Comp

3

4

5

6

7

8

9

47 k

0.1

mF

3.3 k

15

14

13

1

mF

14 V

16

12

10

11

12

V

V

Re: NCP1650/D data sheet, Figure 24