1

Resultant frequency f =

1.8

Resultant frequency f

»

During the discharge time, the internal clock signal

maximum duty cycle. Charge and discharge times are

determined by the formulae:

.0063 – 4

(

)

IP1842 SERIES

IP1843 SERIES

Prelim.3/00

Website: http://www.semelab.co.uk

Open–Loop Laboratory Test Fixture

APPLICATIONS INFORMATION

High peak current 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 5K potentiometer are used to sample the oscillator wave

form and apply an adjustable ramp to pin 3.

1

2

3

4

8

7

6

5

COMP

V

REF

GROUND

OUTPUT

R

V

CC

I

SENSE

V

FB

COMP

V

REF

GROUND

OUTPUT

1

2

3

4

POWER

GROUND

5

6

7

14

13

12

11

10

9

8

N/C

R

I

SENSE

N/C

N/C

N/C

V

CC

V

FB

V

C

Oscillator Waveforms and Maximum Duty Cycle