FSP33035SD datasheet(2/28 Pages) FOSLINK

2 / 28 page

BRUSHLESS DC MOTOR CONTROLLER

2007-3-16

2/28

FSP33035

PIN DESCRIPTION

Pin Number

Pin Name

Pin Function

1, 2, 24

BT , AT , CT

These three open collector Top Drive outputs are designed to drive

the external upper power switch transistors.

Fwd/Rev

The Forward/Reverse Input is used to change the direction of motor

rotation.

4, 5, 6

SA, SB, SC

These three Sensor Inputs control the commutation sequence.

Output Enable

A logic high at this input causes the motor to run, while a low causes it to

coast.

Reference Output This output provides charging current for the oscillator timing capacitor CT

and a reference for the error amplifier. It may also serve to furnish sensor

power.

Current Sense

Noninverting Input

A 100 mV signal, with respect to Pin 15, at this input terminates output

switch conduction during a given oscillator cycle. This pin normally

connects to the top side of the current sense resistor.

Oscillator

The Oscillator frequency is programmed by the values selected for the

timing components, RT and CT.

Error Amp

Noninverting Input

This input is normally connected to the speed set potentiometer.

Error Amp

Inverting Input

This input is normally connected to the Error Amp Output in open loop

applications.

Error Amp

Out/PWM Input

This pin is available for compensation in closed loop applications.

Fault Output

This open collector output is active low during one or more of the following

conditions: Invalid Sensor Input code, Enable Input at logic 0, Current

Sense Input greater than 100 mV (Pin 9 with respect to Pin 15),

Undervoltage Lockout activation, and Thermal Shutdown.

Current Sense

Inverting Input

Reference pin for internal 100 mV threshold. This pin is normally

connected to the bottom side of the current sense resistor.

Gnd

This pin supplies a ground for the control circuit and should be referenced

back to the power source ground.

VCC

This pin is the positive supply of the control IC. The controller is functional

over a minimum VCC range of 10 to 30 V.

The high state (VOH) of the Bottom Drive Outputs is set by the voltage

applied to this pin. The controller is operational over a minimum VC range

of 10 to 30 V.

19, 20, 21

CB, BB, AB

These three totem pole Bottom Drive Outputs are designed for direct drive

of the external bottom power switch transistors.

60°/120 ° Select

The electrical state of this pin configures the control circuit operation for

either 60° (high state) or 120°(low state) sensor electrical phasing inputs.

Brake

A logic low state at this input allows the motor to run, while a high state

does not allow motor operation and if operating causes rapid deceleration.

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