ML4425 데이터 시트보기 (PDF) - Fairchild Semiconductor

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ML4425

Sensorless BLDC Motor Controller

Fairchild Semiconductor 

PRODUCT SPECIFICATION

ML4425

Pin Description (continued)

Pin

Name

Function

16

RVCO

An resistor to GND sets up a current proportional to the input voltage of the VCO.

17

C AT

A capacitor to GND sets the time that the controller stays in the align mode.

18

UV FAULT This output goes low when VDD drops below the UVLO threshold, and indicates that

all output drivers have been disabled.

19

C RT

A capacitor to GND sets the time that the controller stays in the ramp mode.

20

SPEED FB Output of the back-EMF sampling circuit and input to the VCO. An RC network

connected to SPEED FB sets the compensation for the PLL loop formed by the

back-EMF sampling circuit, the VCO, and the commutation state machine.

21

CRR

A capacitor to between CRR and SPEED FB sets the ramp rate (acceleration) of the

motor when the controller is in ramp mode.

22

FB A

The motor feedback voltage from phase A is monitored through a resistor divider for

back-EMF sensing at this pin.

23

FB B

The motor feedback voltage from phase B is monitored through a resistor divider for

back-EMF sensing at this pin.

24

FB C

The motor feedback voltage from phase C is monitored through a resistor divider for

back-EMF sensing at this pin.

25

BRAKE A logic low input activates motor braking by shutting off the high-side output drivers

and turning on the low-side output drivers.

26

CIOS

A capacitor to GND sets the time that the low-side output drivers remain off after

ISENSE exceeds its threshold .

27

RREF

An 137kΩ resistor to GND sets a current proportional to VREF that is used to set all

the internal bias currents except for the VCO.

28

GND

Signal and power ground.

Absolute Maximum Ratings

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum

ratings are stress ratings only and functional device operation is not implied.

Parameter

VDD

Logic Inputs (SPEED FB, BRAKE)

All Other Inputs and Outputs

Output Current (LA, LB, LC, HA, HB, HC)

Junction Temperature

Storage Temperature Range

Lead Temperature (Soldering 10 sec.)

Thermal Resistance (θJA)

28-Pin Narrow PDIP

28-Pin SOIC

Min.

GND – 0.3

GND – 0.3

-65

Max.

14

7

VDD + 0.3

±50

150

150

260

48

75

Units

V

V

V

mA

°C

°C

°C

°C/W

°C/W

Operating Conditions

Parameter

Temperature Range

ML4425CX

ML4425IX

VDD

Min.

0

–40

10.8

Max.

70

85

13.2

Units

°C

°C

V

REV. 1.0.2 7/2/01

3

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