AH5773

Document number: DS35444 Rev. 2 - 2

2 of 17

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January 2015

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AH5773

Typical Applications Circuit

FG

O1

O2

FG

GND

10k

W

AH5773

PWM

SYSTEM

POWER

PWM signal for

speed control

Dz

C1

D1

Optional

Motor

Coil

GND

Notes:

4. C1 is for power stabilization and to strengthen the noise immunity; the recommended value is 2.2µF. The value of capacitor can be optimized depending

on the operating mode, motor voltage and the motor current. For PWM speed control mode, with datasheet current capability, the recommended

capacitor value is 2.2µF, for lower motor current 1µF and higher should be used. If PWM speed control function is not used (PWM pin tied high or not

connected) the capacitor value can be reduced towards 0.1µF. The value of the C1 should be checked in the motor design in its operating conditions if it

is reduced from the recommended value of 2.2µF.

5. The AH5773 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically a pull-up resistor of 10k

Ω is recommended

from FG pin to the supply voltage.

Pin Descriptions

Package Type: MSOP-8EP

Pin Number

Pin Name

Description

1

FG

Frequency Generator (FG) - The FG output is the same as the magnetic change frequency

2

PWM

PWM signal input pin for speed control

3

O2

Output drive sourcing & sinking pin

4

GND

Ground pin

5

O1

Output drive sourcing & sinking pin

6

Power supply input pin

7

NC

No connection (Note 6)

8

NC

No connection (Note 6)

Pad

Pad

Exposed pad for thermal dissipation. It can be connected to GND or left open circuit.

Note:

6.

NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.

Package Type: U-DFN2020-6

Pin Number

Pin Name

Description

1

PWM

PWM signal input pin for speed control

2

Power supply input pin

3

O2

Output drive sourcing & sinking pin

4

GND

Ground pin

5

O1

Output drive sourcing & sinking pin

6

FG

Frequency Generator (FG) - The FG output is the same as the magnetic change frequency

Pad

Pad

Exposed pad for thermal dissipation. It can be connected to GND or left open circuit.