Fujitsu MB3788 manual 180

MB3788

(Continued)

7. Duty - input oscillating frequency characteristic

8.Gain - frequency characteristic and phase - frequency

characteristic

100

Input waveform

VCC = 6 V

40

°

180

1.9V

TA = +25 C

80

VFB = 1.6 V

1.3V

TA = +25°C

60

20

90

Duty

Gain

Phase

Dtr (%)

40

(dB)

0 φ (deg)

0

20

-20

-90

0

-180

0

5K

10K

50K 100K

500K

1M

-40

Input oscillating frequency (Hz)

1K

10K

100K

1M

5M 10M

f (Hz)

9. Power dissipation - ambient temperature characteristic

1000

Circuit for measuring gain - frequency characteristic and

phase - frequency characteristic

2.5 V

2.5 V

240 kΩ

VCC = 6 V

800

Power

600

4.7 kΩ

4.7 kΩ

dissipation

-

PD (mW)

10 ∝F

out

400

in

-

+

+

Error amplifier

200

4.7 kΩ

4.7 kΩ

0

-20 020

406080 100

Ambient temperature TA (°C)

11