LB1997 datasheet(7/9 Pages) SANYO

7 / 9 page

LB1997

No. 5978-7/9

Pin number

Pin name

Pin voltage

Equivalent circuit

Pin function

4V to 13.6V

4V to 6V

1R S

2F G

S/S

SIG GND

9F C

Pin Descriptions

Continued on next page

Source side predrive voltage supply

Constant current control amplifier

voltage supply pin

Power supply pin for all circuits

except output transistors, source

predriver, and low current control

amplifier

Reverse detector pin

Forward rotation: High

Reverse rotation: Low

1 Hall element waveform Schmitt

comparator composite output

U phase Hall element input and

reverse detector U phase Schmitt

comparator input pin

Logic High indicates UIN1 > UIN2.

V phase Hall element input and

reverse detector V phase Schmitt

comparator input pin

Logic High indicates VIN1 > VIN2.

W phase Hall element input and

reverse detector W phase Schmitt

comparator input pin

Logic High indicates WIN1 > WIN2.

Hall element lower side bias voltage

supply pin

When this pin is at 0.7V or lower, or

when it is open, all circuits are

inactive. When driving motor, set

this pin to 2V or higher.

Control loop frequency compensa-

tor pin. Connecting a capacitor

between this pin and GND prevents

closed loop oscillation in current

limiting circuitry.

GND pin for all circuits except

output

VCC2

VCC3

VCC1

UIN1

UIN2

VIN1

VIN2

WIN1

WIN2

1.2V to

VCC1–1V

0V to VCC1

14 15

VCC1

100

µA

10 k

Ω

A11184

µA

200

Ω

200

Ω

VCC1

A11185

VCC1

µA

30 k

Ω

2 k

Ω

A11186

VCC1

50 k

Ω

A11187

75 k

Ω

VCC1

2 k

Ω

20 k

Ω

5 k

Ω

A11188

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