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LB1845

Monolithic Digital IC PWM Current Controlling Stepping Motor Driver

SANYO -> Panasonic 

LB1845

Pin Description

Pin No

1, 14

2

13

3

12

4, 11

Pin

VBB

SENSE1

SENSE2

E1

E2

D-GND

6

OUT1B

7

OUT1A

8

OUT2B

9

OUT2A

15

GND

27

RC1

16

RC2

26

VREF1

17

VREF2

25

PHASE1

18

PHASE2

24

ENABLE1

19

ENABLE2

22, 23

21, 20

28

I01, I11

I02, I12

VCC

Function

Output stage power-supply voltage

Set current detection pins.

Connect these pins, fed back through noise filters, to E1 and E2.

The set current is controlled by the resistors Re inserted between these pins and ground.

Internal diode anode connection

Outputs

Ground

Used to set the output off time for the switched output signal.

The fixed off times are set by the capacitors and resistors connected to these pins. toff = CR.

Output current settings

The output current is determined by the voltage (in the range 1.5 to 7.5V) input to these pins.

Output phase switching inputs.

High-level input: OUTA = high, OUTB = low

Low-level input: OUTA = low, OUTB = high

Output on/off settings

High-level input: output off

Low-level input: output on

Digital inputs that set the output current

The output currents can be set to 1/3, 2/3, or full by setting these pins to appropriate combinations of high and low levels.

Logic block power supply

Timing chart for pin switching operations during PWM drive

RC pin

E pin

td

Spike noise

SENSE pin

VOUT pin

toff

ILB00884

Figure 1 Switching Waveforms

toff: Output off time. Determined by external capacitor and resistor Ct and Rt. (toff ≈ Ct × Rt)

td: Delay time between the point the set current is sensed at the SENSE pin and the point the output turns off.

No.5505-5/9

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