5/16

UC384XA - UC284XA

Figure 4. Open Loop Test Circuit.

High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and

bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5 K

Ω

potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3.

A

2N2222

4.7K

Ω

1K

Ω

ERROR AMP.

ADJUST

4.7K

Ω

5K

Ω

ADJUST

100K

Ω

COMP

1

2

3

4

7

6

5

8

OUTPUT

GROUND

0.1

µF

0.1

µF

OUTPUT

GROUND

1W

1K

Ω

D95IN343

Figure 5. Oscillator Frequency vs Timing

Resistance

Figure 6. Maximum Duty Cycle vs Timing

Resistor

Figure 7. Oscillator Discharge Current vs.

Temperature.

Figure 8. Error Amp Open-Loop Gain and

Phase vs. Frequency.

300

1K

3K

10K

30K

1K

10K

100K

1M

(Hz)

D96IN362

CT=470pF

1nF

2.2nF

4.7nF

300

1K

3K

10K

30K

0

20

40

60

(Hz)

D96IN363

80

-55

-25

0

25

50

75

7.0

7.5

8.0

8.5

(mA)

D95IN335

10

100

1K

10K

100K

1M

f(Hz)

-20

0

20

40

60

80

(dB)

180

150

120

90

60

30

φ

D95IN337

Gain

Phase