AMIS-30521 데이터 시트보기 (PDF) - ON Semiconductor

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AMIS-30521

Micro-Stepping Motor Driver

ON Semiconductor 

AMIS−30521, NCV70521

TYPICAL APPLICATION SCHEMATIC

VDD

C5

100 nF

mC

100 nF

100 nF 100 nF

D1

+

R2

R3

C4

C2

C3

C6

C1 100 mF

VDD

32

VBB

14

VBB

27

220 nF

VCP

11

DIR

NXT

DO

DI

CLK

CS

CLR

ERR

R1 SLA

C8

9 CPN C7

5

4

10 CPP 220 nF

31

MOTXP

25,26

2 AMIS−30521/

3

NCV70521 21,22 MOTXN

13

M

MOTYP

12

15,16

6

19,20 MOTYN

7

1, 17, 23,

HV20081114.1

8 18 24 30 28 29

TSTO

GND

Figure 6. Typical Application Schematic AMIS−30521/NCV70521

VBAT

Table 8. EXTERNAL COMPONENTS LIST AND DESCRIPTION

Component

C1

C2, C3

C4

C5

C6

C7

C8

R1

R2, R3

D1

Function

VBB Buffer Capacitor (Low ESR < 1 W)

VBB Decoupling Block Capacitor

VDD Buffer Capacitor

VDD Buffer Capacitor

Charge−Pump Buffer Capacitor

Charge−Pump Pumping Capacitor

Low Pass Filter SLA

Low Pass Filter SLA

Pullup Resistor Open Drain Output

Reverse Protection Diode

Typ. Value

100

100

220

100

220

220

1

5.6

4.7

MURD530

Tolerance

Unit

−20 +80%

mF

−20 +80%

nF

$20%

nF

$20%

nF

$20%

nF

$20%

nF

$20%

nF

$1%

kW

$1%

kW

FUNCTIONAL DESCRIPTION

H−Bridge Drivers

A full H−bridge is integrated for each of the two stator

windings. Each H−bridge consists of two low−side and two

high−side N−type MOSFET switches. Writing logic ’0’ in

bit <MOTEN> disables all drivers (High−Impedance).

Writing logic ’1’ in this bit enables both bridges and current

can flow in the motor stator windings.

In order to avoid large currents through the H−bridge

switches, it is guaranteed that the top− and bottom switches

of the same half−bridge are never conductive

simultaneously (interlock delay).

A two−stage protection against shorts on motor lines is

implemented. In a first stage, the current in the driver is

limited. Secondly, when excessive voltage is sensed across

the transistor, the transistor is switched−off.

In order to reduce the radiated/conducted emission,

voltage slope control is implemented in the output switches.

The output slope is defined by the gate−drain capacitance of

output transistor and the (limited) current that drives the

gate. There are two trimming bits for slope control (See

Table 12 SPI Control Parameter Overview EMC[1:0]).

The power transistors are equipped with so−called “active

diodes”: when a current is forced trough the transistor switch

in the reverse direction, i.e. from source to drain, then the

transistor is switched on. This ensures that most of the

current flows through the channel of the transistor instead of

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