HA17431 Series

REJ03D0678-0300 Rev.3.00 Apr 03, 2007

Page 9 of 19

HA17431P/PA/FP/FPA/PNA/UA, HA17432UA

Oscillation Stability vs. Load Capacitance between Anode and Cathode

150

100

50

0

0.0001

0.001

0.01

0.1

2.0

1.0

Stable

region

Oscillation

region

1.5

0

10

20

30

40

50

60

Open Loop Voltage Gain, Phase vs. Frequency Characteristics (1)

(With no feedback capacitance)

Frequency f (Hz)

10

100

1 k

10 k

100 k

180

90

0

8.2 k

Ω

15 k

Ω

220

Ω

GND

Vout

10

µF

Vin

φ

–4

0

5

8

10

Frequency f (Hz)

10

100

1 k

10 k

Open Loop Voltage Gain, Phase vs. Frequency Characteristics (2)

(When a feedback capacitance (Cf) is provided)

360

180

270

50

Ω

GND

20 V

Vout

+

–

2 k

2.4 k

Ω

Vin

200

µF

Cf

Cf = 0.22

µF

Cf = 0.022

µF

φ

G

υ

G

υ