LAB

SEME

IP1844 SERIES

IP1845 SERIES

Prelim. 2/95

Open–Loop Laboratory Test Fixture

.01

.02

.04

.07

.1

.2

.4

.7

1.0

4

3

2

1

0

60

40

20

0

100

80

10

1k

100

10k

10M

100k

1M

.05

.5

.03

.3

OUTPUT CURRENT, SOURCE / SINK (A)

FREQUENCY (Hz)

OUTPUT SATURATION CHARACTERISTICS

ERROR AMPLIFIER OPEN-LOOP

FREQUENCY RESPONSE

V

= 15V

CC

T = 25˚C

A

A

V

B

SOURCE SAT

V -

)

S INK SAT (V

)

OL

(

A

T = –55˚C

–45

–90

–135

–180

0

TYPICAL PERFORMANCE CHARACTERISTICS

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.

0.1

µF

1k

Ω

1kW

1k

Ω

ERROR AMP

ADJUST

4.7k

Ω

5k

Ω

ADJUST

4.7k

Ω

100k

Ω

2N2222

I

SENSE

R

T

C

T

0.1

µF

OUTPUT

GROUND

1

2

45

7

8

36

I

SENSE

O/P

GND

COMP

R

0

20

15

10

0.5

0

10

515

20

0

20

15

10

0.5

0

5

2.5

7.5

10

UNDER VOLTAGE LOCKOUT

1844 SERIES

UNDER VOLTAGE LOCKOUT

1845 SERIES

V

(V)

CC

V

(V)

CC