MC3479P 데이터 시트보기 (PDF) - Motorola => Freescale

부품명

상세내역

제조사

MC3479P

Stepper Motor Driver

Motorola => Freescale 

3.0 V

Clk

0

PWCLKH

1.5 V

tPCD

L1 – L4

6.0 V

Outputs

3.0 V

F/HS,

CW/CCW

Inputs 0

Phase A

Output

MC3479

Figure 4. Clock Timing

(Refer to Figure 2)

PWCLKL

tsu th

1.5 V

tPHLA

1.5 V

tPLHA

p Note: tr, tf (10% to 90%) for input

signals are 10 ns.

Figure 5. Output Stages

VM

VD

B/S

RB

IBS

I′BS

Current

Drivers

and

Logic

QH

QH

Motor Coil

L1

QL

L2

QL

Parasitic

Diodes

To L3, L4

Transistors

Logic Decoding

Circuit

CW / CCW

OIC

F/HS

Clk

The maximum sink current available at the outputs is a

function of the resistor connected between Pin 6 and ground

(see section on Bias/Set operation). Whenever the outputs

are to be in a high impedance state, both transistors (QH and

QL of Figure 5) of each output are off.

VD

This pin allows for provision of a current path for the motor

coil current during switching, in order to suppress back–EMF

voltage spikes. VD is normally connected to VM (Pin 16)

through a diode (zener or regular), a resistor, or directly. The

peaks instantaneous voltage at the outputs must not exceed

VM by more than 6.0 V. The voltage drop across the internal

clamping diodes must be included in this portion of the design

(see Figure 6). Note the parasitic diodes (Figure 5) across

each QL of each output provide for a complete circuit path for

the switched current.

Inputs

Figure 6. Clamp Diode Characteristics

3.0

2.0

1.0

0

0

100

200

300

ID (mA)

MOTOROLA ANALOG IC DEVICE DATA

5

Share Link: