L6238 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6238

SENSORLESS SPINDLE MOTOR CONTROLLER

STMicroelectronics 

L6238

PIN FUNCTIONS (continued)

N.

Name

I/O

23

RUN/BRAKE

I

24 SEQ INCREMENT I

25

SYSTEM CLK

I

26

EXT INDEX

I

27

PLL Fref

I

28

LOCK

O

30

Vlogic

I

31 DETECTOR OUT O

32

FILTER IN

I

33

FILTER COMP

O

34

CSA INPUT

I

35

Rsense

O

36

OUTPUT C

I/O

37

gm COMP

I

38

GATE DRIVE

I/O

41

I LIMIT SET

I

43

CENTER TAP

I

44

SLEW RATE

I

Function

Rising edge will initiate start-up. A Braking rountine is started when this input is

brought low.

A low to high transition on this pin increments the Output State Sequencer.

Clock Frequency for the system timer/counters.

External Source of Feedback for the PLL.

Reference Frequency for the PLL.

High when the PLL is phase_locked.

Logic power supply.

Output of Frequency/Phase Detector.

Filter Input.

Filter output and compensation.

Input to the Current Sense Amplifier.

Output C connection for the Motor Current Sense Resistor to ground.

DMOS Half Bridge Output and Input C for Bemf sensing.

A series RC network to ground that defines the compensation of the

Transconductance Loop.

Drives the Gate of the External P Channel DMOS Driver for Higher Power

Applications. This pin must be grounded if an external driver is not used.

A voltage applied to this pin, in conjunction with the value for the external

Motor Current Sensing resistor, defines the maximum Motor Current.

Motor Center Tap used for differential BEMF sensing. If the center tap of the

Motor is not brought out, a virtual center tap is integrated and available at this

pin.

A resistor connected to this pin sets the Voltage Slew Rate of the Output

Drivers.

ELECTRICAL CHARACTERISTICS (Refer to the test circuit, unless otherwise specified.)

Symbol

Parameter

POWER SECTION

VPower

Motor Supply

RDS(on) Output ON Resistance

Io(leak)

VF

dVo/dt

Im(max)

Output Leakage Current

Body Diode Forward Drop

Output Slew Rate

Motor Current Limit (Note 1)

Igt

Tsd

Thys

Tew

Isnsin

GV

ZinCT

Gate Drive for Ext. Power

DMOS

Shut Down Temperature

Recovery Temperature

Hysteresis

Early Warning Temperature

Current Sense Amp Input Bias

Current

Current Sense Amp Voltage

Gain

Center Tap Input Impedance

Test Condition

Tj = 25°C

Tj = 125°C

Im = 2.0A

Rslew = 100KΩ

Rs = 0.33Ω

Ilim Gain = 0

Ilim Gain = 1

ILIMSET = 5V

Ilim Gain = 0

V33 = 0V, V38 = 5V

Min. Typ. Max. Unit

10.5

12

13.5

V

0.25 0.33

Ω

0.50

Ω

1

mA

1.5

V

0.30

V/µs

TBD 0.75 TBD A/V

TBD 0.38 TBD A/V

5

mA

150

180

°C

30

°C

Tsd-25

°C

10

µA

3.8

4

4.2

V/V

30

KΩ

4/35

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