4

HV9110/HV9112/HV9113

Shutdown

Reset

Output

H

H

Normal Operation

HH

→ L

Normal Operation, No Change

L

H

Off, Not Latched

L

L

Off, Latched

L

→ H

L

Off, Latched, No Change

Truth Table

Shutdown Timing Waveforms

Functional Block Diagram

50%

0

Output

Sense

1.5V

0

50%

90%

90%

Output

0

Shutdown

0

50%

50%

50%

50%

Reset

0

Shutdown

0

50%

t

t

t

Pin numbers in parentheses are for PLCC package

+

–

+

–

+

–

REF

GEN

+

–

+

–

Modulator

Comparator

OSC

R

S

Q

Current Limit

Comparator

9110

9112

COMP

Discharge

OSC

In

OSC

Out

FB

V

REF

BIAS

V

DD

+V

IN

Pre-regulator/Startup

8.6V

8.1V

Undervoltage

Comparator

S

R

Q

Shutdown

Reset

-V

Current Sense

IN

Output

Error

Amplifier

4V

To

Internal

Circuits

1.2V

Current

Sources

To V

DD

2V

TQ

9113

4 (6)

5 (8)

3 (5)

11 (16)

12 (17)

2 (3)

6 (9)

1 (20)

10 (14)

14

(19)

13

(18)

9

(12)

8 (11)

7 (10)