ML4425CS

ML4425CS Datasheet

ML4425

Part	Datasheet
ML4425CS	ML4425CS (pdf)

Related Parts	Information
ML4425CP	ML4425CP
ML4425CSX	ML4425CSX

PDF Datasheet Preview
ML4425 Sensorless BLDC Motor Controller • Stand-alone operation • Motor starts and stops with power to IC • On-board start sequence Align Ramp Set Speed • Patented Back-EMF commutation technique provides jitterless torque for minimum “spin-up” time • Onboard speed control loop • PLL used for commutation provides noise immunity from PWM spikes, compared to noise sensitive zero crossing technique • PWM control for maximum • Direct FET drive for 12V motors drives high voltage motors with IC buffers Block Diagram FB A 22 FB B 23 FB C 24 17 VDD CAT 750nA 1.5V BACK EMF SAMPLER 750nA 1.5V The ML4425 PWM motor controller provides all of the functions necessary for starting and controlling the speed of delta or wye wound Brushless DC BLDC motors without Hall Effect sensors. Back EMF voltage is sensed from the motor windings to determine the proper commutation phase sequence using a PLL. This patented sensing technique will commutate a wide range of 3-Phase BLDC motors and is insensitive to PWM noise and motor snubbing circuitry. The ML4425 limits the motor current using a constant offtime PWM control loop. The velocity loop is controlled with an onboard The ML4425 has circuitry to ensure that there is no shoot-through in directly driven external power MOSFETs. The timing of the start-up sequence is determined by the selection of three timing capacitors. This allows optimization for a wide range of motors and loads. 21 CRR SPEED CVCO FB 16 RVCO VDD 500nA VOLTAGE CONTROLLED OSCILLATOR VCO/TACH 13 VCO OUT SPEED SET 3.9V 5 SPEED COMP 1.7V ISENSE 1 20kHz 1.7V ILIMIT 12 VCO OUT VREF ILIMIT 1-SHOT CIOS 26 COMMUTATION STATE MACHINE 1.4V UVLO GATING LOGIC & OUTPUT DRIVERS Ordering Information Part Number ML4425CP ML4425CS ML4425IP ML4425IS Temperature Range 0°C to 70°C 0°C to 70°C -40°C to 85°C -40°C to 85°C PRODUCT SPECIFICATION Package 28-Pin PDIP P28N 28-Pin SOIC S28 28-Pin PDIP P28N 28-Pin SOIC S28 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 7/2/01 0.0m 003 Stock#DS300042003 Fairchild Semiconductor Corporation

PDF Datasheet Preview

ML4425

Sensorless BLDC Motor Controller
• Stand-alone operation
• Motor starts and stops with power to IC
• On-board start sequence Align Ramp Set Speed
• Patented Back-EMF commutation technique provides
jitterless torque for minimum “spin-up” time
• Onboard speed control loop
• PLL used for commutation provides noise immunity from

PWM spikes, compared to noise sensitive zero crossing technique
• PWM control for maximum
• Direct FET drive for 12V motors drives high voltage motors with IC buffers

Block Diagram

FB A 22

FB B 23

FB C 24
17 VDD CAT
750nA
1.5V

BACK EMF SAMPLER
750nA
1.5V

The ML4425 PWM motor controller provides all of the functions necessary for starting and controlling the speed of delta or wye wound Brushless DC BLDC motors without Hall Effect sensors. Back EMF voltage is sensed from the motor windings to determine the proper commutation phase sequence using a PLL. This patented sensing technique will commutate a wide range of 3-Phase BLDC motors and is insensitive to PWM noise and motor snubbing circuitry.

The ML4425 limits the motor current using a constant offtime PWM control loop. The velocity loop is controlled with an onboard The ML4425 has circuitry to ensure that there is no shoot-through in directly driven external power MOSFETs.

The timing of the start-up sequence is determined by the selection of three timing capacitors. This allows optimization for a wide range of motors and loads.
21 CRR

SPEED CVCO FB
16 RVCO

VDD 500nA

VOLTAGE CONTROLLED OSCILLATOR

VCO/TACH 13

VCO OUT

SPEED SET
3.9V
5 SPEED COMP
1.7V

ISENSE 1
20kHz 1.7V

ILIMIT 12

VCO OUT

VREF

ILIMIT 1-SHOT

CIOS 26

COMMUTATION STATE MACHINE
1.4V

UVLO

GATING LOGIC
& OUTPUT DRIVERS
Ordering Information

Part Number ML4425CP ML4425CS ML4425IP ML4425IS

Temperature Range 0°C to 70°C 0°C to 70°C -40°C to 85°C -40°C to 85°C

PRODUCT SPECIFICATION

Package 28-Pin PDIP P28N 28-Pin SOIC S28 28-Pin PDIP P28N 28-Pin SOIC S28

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
7/2/01 0.0m 003 Stock#DS300042003 Fairchild Semiconductor Corporation

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived ML4425CS Datasheet file may be downloaded here without warranties.

Datasheet ID: ML4425CS 634332