3/13

L292

ELECTRICAL CHARACTERISTCS

SYSTEM DESCRIPTION

The L290, L291 and L292 are intended to be used as a 3-chip microprocessor controlled positioning sys-

tem. The device may be used separately - particularly the L292 motor driver - but since they will usually

be used together, a description of a typical L290/1/2 system follows.

At the time, the microprocessor orders a switch to the position mode, (strobe signal at pin 8 of L291) and

within 3 to 4 ms the L292 drives the motor to a null position, where it is held by electronic "de-tenting".

The mechanical/electrical interface consists of an

Figure 1. System Block Diagram

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Supply Voltage

18

36

V

Quiescent Drain Current

30

50

mA

Input Offset Voltage (pin 6)

+350

mV

Inhibit Low Level (pin 12, 13)

2

V

Inhibit High Level

3.2

V

Low Voltage Condition

-100

µA

High Voltage Condition

10

µA

Input Current (pin 6)

-1.8

mA

0.5

mA

Input Voltage (pin 6)

9.1

-9.1

V

V

Output Current

±2

A

Total Drop Out Voltage

Including sensor resistor

5

3.5

V

V

Sensing Resistor Voltage Drop

0.44

V

Transconductance

205

220

235

mA/V

120

mA/V

Frequency range (pin 10)

1

30

kHz

I

o

V

i

-----