Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - motor controllers Pre-driver - half bridge (3) PWM SOIC 28

 

SLUS318B – APRIL 1999 – REVISED JANUARY 2002

 

 

www.ti.com

FEATURES

Two-Quadrant and Four-Quadrant Operation

D Integrated Absolute Value Current Amplifier

D Pulse-by-Pulse and Average Current Sensing

D Accurate, Variable Duty-Cycle Tachometer

Output

D Trimmed Precision Reference

D Precision Oscillator

D Direction Output

DESCRIPTION

The UCC3626 motor controller device combines

many of the functions required to design a

high-performance, two- or four-quadrant, three-

phase, brushless dc motor controller into one

package. Rotor position inputs are decoded to

provide six outputs that control an external power

stage. A precision triangle oscillator and latched

comparator provide PWM motor control in either

voltage- or current-mode configurations. The

oscillator is easily synchronized to an external

master clock source via the SYNCH input.

Additionally, a QUAD select input configures the

chip to modulate either the low-side switches only,

or both upper and lower switches, allowing the

user to minimize switching losses in less

demanding two-quadrant applications.

The device includes a differential current-sense

amplifier and absolute-value circuit which provide

an accurate reconstruction of motor current,

useful for pulse-by-pulse overcurrent protection,

as well as closing a current control loop. A

precision tachometer is also provided for

implementing closed-loop speed control. The

TACH_OUT signal is a variable duty-cycle,

frequency output, which can be used directly for

digital control or filtered to provide an analog

feedback signal. Other features include COAST,

BRAKE, and DIR_IN commands, along with a

direction output, DIR_OUT.

        

         

       

   

Summary of content (23 pages)

PAGE 1
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 FEATURES D Two-Quadrant and Four-Quadrant Operation D Integrated Absolute Value Current Amplifier D Pulse-by-Pulse and Average Current Sensing D Accurate, Variable Duty-Cycle Tachometer Output D Trimmed Precision Reference D Precision Oscillator D Direction Output DESCRIPTION The UCC3626 motor controller device combines many of the functions required to design a high-performance, two- or four-quadrant, threephase, brushless
PAGE 2
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 AVAILABLE OPTIONS TA PDIP (N) PACKAGED DEVICES SOIC{ (DW) TSSOP{ (PW) –40_C to 85_C UCC2626N UCC2626DW UCC2626PW 0_C to 70_C UCC3626N UCC3626DW UCC3626PW {The DW and PW packages are available taped and reeled. Add TR suffix to device type (e.g. UCC2626DWTR) to order quantities of 2,000 devices per reel.
PAGE 3
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 block diagram 28 VDD 2 VREF 27 AHI 25 BHI 23 CHI 26 ALOW 24 BLOW QUAD 20 5 VOLT REFERENCE BRAKE 19 COAST 18 1.
PAGE 4
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 electrical characteristics over recommended operating conditions, VCC = 12 V; CT = 1 nF, R_TACH = 250 kΩ, C_TACH = 100 pF, TA = TJ, TA = –40°C to 85°C for the UCC2626, and 0°C to 70°C for the UCC3626 (unless otherwise noted) overall PARAMETER TEST CONDITIONS Supply current Outputs not switching MIN TYP MAX UNIT 1 3 5 MIN TYP MAX UNIT mA undervoltage lockout PARAMETER TEST CONDITIONS Start threshold UVLO hysteresis 9.0 10.
PAGE 5
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 electrical characteristics over recommended operating conditions, VCC = 12 V; CT = 1 nF, R_TACH = 250 kΩ, C_TACH = 100 pF, TA = TJ, TA = –40°C to 85°C for the UCC2626, and 0°C to 70°C for the UCC3626 (unless otherwise noted) hall buffer inputs PARAMETER TEST CONDITIONS MIN TYP MAX 1.9 2.1 High-level input voltage HALLA, HALLB, HALLC 1.7 Hysteresis HALLA, HALLB, HALLC 0.6 Input current 0V < VIN < 5 V 1.
PAGE 6
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 pin descriptions AHI, BHI, CHI: Digital outputs used to control the high-side switches in a three-phase inverter. For specific decoding information reference Table I. ALOW, BLOW, CLOW: Digital outputs used to control the low-side switches in a three-phase inverter. For specific decoding information reference Table I. BRAKE: BRAKE is a digital input which causes the device to enter brake mode.
PAGE 7
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 pin descriptions SYNCH: The SYNCH input is used to synchronize the PWM oscillator with an external digital clock. When using the SYNCH feature, a resistor equal to R_TACH must be placed in parallel with CT. When not using the SYNCH feature, SYNCH must be grounded. SNS_NI, SNS_I: These inputs are the noninverting and inverting inputs to the current sense amplifier, respectively. The integrated amplifier is configured for a gain of five.
PAGE 8
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION The UCC3626 is designed to operate with 120° position sensor encoding. In this format, the three position sensor signals are never simultaneously high or low. Motors whose sensors provide 60° encoding, can be converted to 120° using the circuit shown in Figure 1. In order to prevent noise from commanding improper commutation states, some form of low-pass filtering on HALLA, HALLB, and HALLC is recommended.
PAGE 9
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION configuring the oscillator The UCC3626 oscillator is designed to operate at frequencies up to 250 kHz and provide a triangle waveform on CT with a peak-to-peak amplitude of 5 V for improved noise immunity.
PAGE 10
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION programming the tachometer The UCC3626 tachometer consists of a precision 5-V monostable, triggered by either a rising or falling edge on any of the three Hall inputs, HALLA, HALLB, and HALLC. The resulting TACH_OUT waveform is a variable duty-cycle square wave whose frequency is proportional to motor speed, as given by: TACH_OUT + V 20 P Hz (3) where P is the number of motor pole pairs and V is motor velocity in RPM.
PAGE 11
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION The TACH_OUT signal can be used to close a digital velocity loop using a microcontroller, as shown in Figure 6, or directly low-pass filtered in an analog implementation, Figure 7. UCC3626 MC68HC11 AD558 PB0–PB7 DB0–DB7 PC0 VCE 4 R_TACH 5 C_TACH 6 CT 14 PWM_NI VCS VOUT 13 PWM_I VOUTSENSE VOUTSELECT IC1 3 TACH_OUT UDG–97188 Figure 6.
PAGE 12
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION When configured for two-quadrant operation, (QUAD=0), the UCC3626 modulates only the low-side devices of the output power stage. The current paths within the output stage during the PWM on- and off-times are illustrated in Figure 9. During the on interval, both switches are on, and current flows through the load down to ground.
PAGE 13
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION By pulse width modulating both the upper and lower power devices (QUAD=1), motor current always decays during the PWM off time, eliminating any uncontrolled circulating currents. In addition, current always flows through the current sense resistor, providing a suitable feedback signal. Figure 11 illustrates the current paths during a four-quadrant torque reversal.
PAGE 14
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION ROTOR POSITION IN ELECTRICAL DEGREES 0 60 120 180 240 300 360 420 480 540 600 660 720 H1 SENSOR INPUTS H2 H3 Code 101 100 110 010 011 001 101 100 110 010 011 001 HIGH SIDE AHI OUTPUTS QUAD=0 BHI CHI ALO LOW SIDE OUTPUTS BLO QUAD=0 CLO + A 0 – MOTOR PHASE CURRENTSB QUAD=0 + 0 – + C 0 – HIGH SIDE AHI OUTPUTS QUAD=1 BHI CHI ALO LOW SIDE OUTPUTS BLO QUAD=1 CLO + A 0 – MOTOR PHASE CURRENTSB
PAGE 15
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION power stage design considerations The flexible architecture of the UCC3626 requires the user to pay close attention to the design of the power output stage. Two- and four-quadrant applications not requiring the brake function are able to use the power stage approach illustrated in Figure 13a. In many cases the body diode of the MOSFET can be used to reduce parts count and cost.
PAGE 16
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION current sensing The UCC3626 includes a differential current-sense amplifier with a fixed gain of five, along with an absolute value circuit. The current-sense signal should be low pass filtered to eliminate leading-edge spikes. In order to maximize performance, the input impedance of the amplifier should be balanced.
PAGE 17
SLUS318B – APRIL 1999 – REVISED JANUARY 2002 APPLICATION INFORMATION Figure 17 illustrates a simple 175-V, 2-A, two-quadrant velocity controller using the UCC3626. The power stage is designed to operate with a rectified off-line supply using IR2210s to provide the interface between the low voltage control signals and the power MOSFETs. The power topology illustrated in Figure 13c is implemented in order to provide braking capability.
PAGE 18
FROM HALL SENSORS 18 R6 499 Ω www.ti.com + R10 C8 R9 10 kΩ R29 U5A 1/2 LM358 C7 C6 100 pF R8 10 kΩ C3 2200 pF + C9 0.1 µF R11 160 kΩ 8 DIR_OUT 13 PWM_I 3 14 PWN_IN TACH_OUT IOUT 11 5 4 CT SYNCH CTACH RTACH 6 7 18 COAST OC_REF 12 9 19 BRAKE SNS_NI SNS_I 10 QUAD CLOW 22 21 DIR_IN 20 17 HALLC BLOW 24 16 HALLB CHI 23 BHI 25 AHI 27 ALOW 26 GND VREF UCC3626 15 HALLA 1 2 28 VDD U5B 1/2 LM358 C1 0.1 µF VREF C2 0.
PAGE 19
PACKAGE OPTION ADDENDUM www.ti.
PAGE 20
PACKAGE OPTION ADDENDUM www.ti.com 28-Aug-2010 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
PAGE 21
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device UCC3626DWTR Package Package Pins Type Drawing SOIC DW 28 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 32.4 Pack Materials-Page 1 11.35 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 18.67 3.1 16.0 32.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC3626DWTR SOIC DW 28 1000 367.0 367.0 55.
PAGE 23
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.