8

HV506

- HV

High Impedance

High Impedance

High Impedance

Output n

Output n+1

Sink*

SCR

Source*

SCR

0V

Drive Current

Disabled

Drive Current

Disabled

(Source SCR)

HV Switching Waveforms and Operation

To drive a TFEL row with a negative pulse: The desired sink SCR

is enabled and V

switch. After holding the output at the -HV level, the switch is

opened in order to set the sink SCR current to zero. The row is

then discharged through a discharge diode when D

to GND. The application of a positive pulse to a row operates in

a similar manner using the selected source SCR and D

*

Notes internal device handling current flow. Refer to Typical Output Circuit Connections for schematic.