5

HV861

Figure 3: Typical Waveform EL1, COM1 and Differential Waveform EL1 – COM1

Split Supply Configuration

The HV861 can also be used for handheld devices operating

from a battery where a regulated voltage is available. This

is shown in Figure 4. The regulated voltage can be used to

run the internal logic of the HV861. The amount of current

necessary to run the internal logic is 250µA max. Therefore,

the regulated voltage could easily provide the current with-

out being loaded down.

Enable/Disable Configuration

EL1 and EL2 outputs can be enabled and disabled via a

logic control signal on the EN1 and EN2 pins respectively.

When EN1 is high/low, the Lamp1 (EL1) will be ON/OFF.

When EN2 is high/low, the Lamp2 (EL2) will be ON/OFF.

The control signal can be from a microprocessor.

Figure 4: Split Supply and Enable/Disable Configuration

L

X

R

REG

R

EL

R

SW

C

DD

C

REF

Input Logic Control:

Input Logic Control:

GND

EN1

VDD

1

2

3

4

8

7

6

5

9

10

11

12

14

15

16

13

PWM

VREF

EN2

RSW-osc

REL-osc

VREG VOUT LX

CS

EL1

COM1

EL2

COM2

HV861K7-G

EL1

EL2

C

S

D

Battery Voltage = V

IN

+

_

Regulated Voltage = V

DD

+

_

C

IN