L6223 STMicroelectronics, L6223 Datasheet

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L6223

Manufacturer Part Number
L6223
Description
DMOS PROGRAMMABLE HIGH SPEED UNIPOLAR STEPPER MOTOR DRIVER
Manufacturer
STMicroelectronics
Datasheet

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March 1998
DESCRIPTION
The L6223 is a programmable integrated system
for driving a unipolar stepper motor. It is realized
in Multipower BCD technology. The DMOS output
BLOCK DIAGRAM
HIGH EFFICIENCY UNIPOLAR STEPPER
MOTOR DRIVER
HIGH SPEED UNIPOLAR STEPPER MOTOR
DRIVER
SUPPLY VOLTAGE UP TO 46V
PHASE CURRENT UP TO 1A
UP TO 2A/PHASE IN DUAL CONFIGURA-
TION
PARALLEL CMOS
FULL/HALF STEP MOTOR ROTATION
SERIAL INTERFACE FOR 6 BIT PROGRAM-
MING
CLOSE/OPEN LOOP, 8 PWM CURRENT
LEVELS
DUAL PWM FREQUENCY SELECTION
INPUT BIDIRECTIONALLY PROTECTED
THERMAL SHUTDOWN
HIGH SPEED UNIPOLAR STEPPER MOTOR DRIVER
P INTERFACE FOR
stage, realized by a single upper DMOS switch
and four lower DMOS, can deliver up to 1A/phase
with motor supply voltages up to 46V.
All inputs are CMOS and microprocessor compat-
ible. An internal 6-bit shift register allows the de-
vice to be programmed to select different duty cy-
cles in open loop mode and different chopping
frequencies in closed loop mode. When the cur-
rent control is in closed loop mode it is also possi-
ble to select a reduced current chopping level to
optimize system efficiency. The L6223 is de-
MULTIPOWER BCD TECHNOLOGY
DMOS PROGRAMMABLE
ORDERING NUMBER : L6223
POWERDIP
L6223
16+2+2
1/33

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L6223 Summary of contents

Page 1

... CLOSE/OPEN LOOP, 8 PWM CURRENT LEVELS DUAL PWM FREQUENCY SELECTION INPUT BIDIRECTIONALLY PROTECTED THERMAL SHUTDOWN DESCRIPTION The L6223 is a programmable integrated system for driving a unipolar stepper motor realized in Multipower BCD technology. The DMOS output BLOCK DIAGRAM March 1998 DMOS PROGRAMMABLE MULTIPOWER BCD TECHNOLOGY ...

Page 2

... PCB, see fig. 34 PIN CONNECTION ( top wiew ) THERMAL DATA R Thermal Resistance Junction-pins thj-pins R Thermal Resistance Junction-ambient thj-amb 2/33 The L6223 is mounted in a 20-lead Powerdip package, (16+2+2). Four ground leads conduct heat to dedicated heatsink area on the PCB. Parameter = 90 C pins (**) amb Value ...

Page 3

... SIMPLIFIED MODE - IN1 and IN2 drive the phases,IN3 is ENABLE, IN4 works with DA/CLEV to enable the reduce current level. Previous programming not needed. Input for external RC network. Defines the higher of two possible chopping frequencies. If this pin is set to ground it will reset the IC. Logic supply. Output for sense resistor. L6223 3/33 ...

Page 4

... L6223 ELECTRICAL CHARACTERISTICS ( 3.3nF, unless otherwise specified). Symbol Parameter V Power Supply S V Logic Supply SS I Power Supply Quiescent S Current I Logic Supply Quiescent SS Current I Output Leakage Curr Reset Threshold rs Voltage (Pin 14) T Bootstrap Refresh Pulse BOOT SINK MOS R ON Resistance ...

Page 5

... Min (Fig. 5) (load) Pure Resistive Load (Fig. 5) (load) Pure Resistive Load (Fig. 4) Note 1 (Fig. 6) 1.7 (Fig. 6) Note 2 0.2 (Fig (Fig. 6) 1.6 (Fig. 6) 200 Figure 2a: Source Output DMOS R Circuit L6223 Typ Max Unit 250 ns 700 Test DS(ON) 5/33 ...

Page 6

... L6223 Figure 2b: Sink Output DMOS R DS(ON) Figure4: SenseFilter RC Time Constantand PWM Closed Loop control Circuit Figure 6: Programming Timing Diagram (see Block Diagram) 6/33 Figure 3: Typical normalized R Test Circuit temperature Figure 5: Output Sink Current Delay vs Input Control vs. Junction DS(ON) ...

Page 7

... For this transistor a charge pump circuit provides its necessary gate drive over voltage. The microprocessor outputs are interfaced with the L6223 output stages through the input logic block. This block also protects the device from mi- croprocessor output errors and failures from the power section back to the microprocessor out- puts ...

Page 8

... L6223 Table 1 Device status Bit C5 IN1 Simplified Phase A mode L operating Driver Full mode Phase A H operating Programming X L mode Figure 7: Internal Six-Bit Shift Register Bit Functions CIRCUIT OPERATION (continued) The FULL OPERATING MODE permits all the driving possibilities. The 4 low side DMOS transis- ...

Page 9

... IN1...IN4 Low to carry a single bit. This per- mits the motor to be enabled for the 50% of total programming time. During the motor rotation it’s suggested to program the device immediately af- ter the motor phase change: this make neglect- able the motor driving discontinuity due to the de- vice programming. L6223 9/33 ...

Page 10

... L6223 Operating Mode The bit C5 defines the two available input configu- rations FULL MODE OPERATING The digital inputs have the following functions: IN1 drives OUT1 The output DMOS is ON IN2 drives OUT2 when the corrisponding in- IN3 drives OUT3 put is low ...

Page 11

... Table Output Disabled *) RC discharge time percentage L6223 Operating Configuration vs. 6bits Shift Register Programming (External RC network 18k C = 3,3nF) SHIFT REGISTER bITS ...

Page 12

... The motor torque is proportional to the vectorial sum of the phase currents: it can be seen that the unipolar stepper motor control actu- ated by L6223 in half step is at constant torque but not at constat current. Close Loop Open Loop ...

Page 13

... Figure 10: Typical Application Circuit using a single device: the max peak current capability is of 1A/phase ( Figure 11: Inputs for Half Step drive, single device FMO. Figure 13: Inputs for Full Step drive single device SMO. Figure 12: Inputs for Full Step drive, single device FMO. L6223 13/33 ...

Page 14

... L6223 Figure 14: Peak current 2I crossing the sense resistor Full Steps, 2 phase ON) Figure 15: Peak current (2I /2 phase ON) and reduced peak current (1.4I p resistor R in Half step drive. The phase sequence is Half Steps, 1 phase ON and 2 phases ON alternatively) Figure 16: Typical Application Circuit using 2 devices (Paralleled configuration): the max peak current ...

Page 15

... Figure 18: Inputs for Full Step drive single device SMO. Dot Matrix Printer Motor Driver Fig. 19 shows how to drive the paper feed and the carriage motors by means of 3 L6223 using a very low wire number. The carriage motor is driven by two paralleled L6223, the paper feed motor, which requires a lower current, uses one L6223 ...

Page 16

... L6223 Figure 19: Dot Matrix Printer Motor Driver schematic diagram (See also fig. 10, 16). External RC Network (pin 14) The external RC network provides the higher of the two possible chopping frequencies. The dis- charge time of the capacitor represents the mini- mum t available in closed loop. In open loop it ...

Page 17

... Because of that, driving high speedy stepper mo- tors is produced a noisy beating between chop- ping frequency and phase change rate. In the L6223 as soon as the phase change is driven by the inputs, the oscillator voltage Jumps to its top level, a new discharge period is gener- ated and the chopping transistor is switched ON (Q5 in fig ...

Page 18

... During these events the L6223 can be pro- grammed several times for different working modes. The most important parameter is the cur- rent through the windings of the stepper: at the time ...

Page 19

... Motorresistance Motorinductance Rotation speed Peak of the BEMF Max ambient temperature T and t ON OFF Max junction temperature T From the Electrical Characteristics of the L6223 (Typical value): Internal Reference Voltage V Sink DMOS R DSON Source DMOS R DSON Power Supply Current Logic Supply Current From Fig. 3 (see pag. 6) the following is obtained: 1 ...

Page 20

... L6223 1 DSON 0.7 = 1.15 DSON 12.5 tot V = 26.24V (During the chopping 9.7 (During the chopping) OFF DC = 15. msec 250 s (During the phase change) 1 PdL = 1.1W PdH = 0.4W Pdch = 0.20W Pdo = 0.24W At last 1.94W tot The needed thermal resistance between junction and ambient must be equal to: ...

Page 21

... Figure 26: Phase current waveform during chopping: the current decay during t Figure 27: Simplified waveforms of the current through the phase A (winding MA) and through the phase B (winding MB). See also fig.22. 55 C); the copper side C/W - See Fig. 34) and the additional heatsink ( C/W). thj-amb = thj-amb L6223 thj-amb is halved. OFF 21/33 ...

Page 22

... L6223 Figure 28a: Single L6223 slow speed, Application Data. Figure 28b: Total Power Dissipation. The vertical indicator tells us the max value of the current we can supply to the windings (Ip = 0.8A). The peak current corresponding to the flat side of each of the three shown trends is not allowed ...

Page 23

... Figure 29a: Single L6223 high speed, Application Data. Figure 29b: Total Power Dissipation. L6223 23/33 ...

Page 24

... L6223 Figure 30a: Dual L6223 slow speed, Application Data. Figure 30b: Total Power Dissipation. 24/33 ...

Page 25

... Figure 31a: Dual L6223 high speed, Application Data. Figure 31b: Total Power Dissipation. L6223 25/33 ...

Page 26

... Single and Dual Device configuration is shown in Fig. 32a-b. Fig the corresponding electri- cal circuit. On the board are mounted three L6223: two for the Dual Device configuration and one for the Single Device. The three connectors J1, J2, J3 allow the application board to be inter- faced with the PC and to be paralleled with an- other one ...

Page 27

... Figure 32a: L6223 p.c.b. (components side). L6223 27/33 ...

Page 28

... L6223 Figure 32b: L6223 p.c.b. (back side). 28/33 ...

Page 29

... Figure 33: L6223 Development Board schematic diagram. L6223 29/33 ...

Page 30

... L6223 Figure 34: R with two ”on board” square heatsink vs. side I. th Figure 35: Transient thermal resistance for single pulses Thermal characteristics. The p.c.b. copper size needed for a defined ther- mal resistance between junction and ambient is shown in Fig. 34. Fig. 35 and Fig. 36 are useful to ...

Page 31

... The value of the boot- strap capacitor is not a critical parameter, never- theless the use of a capacitor of 10nF 20% is recommended. A non-inductive resistor is the best way to implement the sensing, but when that is not possible, more metalfilm resistors of the same value can be paralleled. L6223 . It’s impor- 31/33 ...

Page 32

... L6223 POWERDIP20 PACKAGE MECHANICAL DATA DIM. MIN. TYP. a1 0.51 B 0.85 b 0. 8.80 e 2.54 e3 22. 3.30 Z 32/33 mm MAX. MIN. 0.020 1.40 0.033 0.50 0.015 24.80 7.10 5.10 1.27 inch TYP. MAX. 0.055 0.020 0.020 0.976 0.346 0.100 0.900 0.280 0.201 0.130 0.050 ...

Page 33

... SGS-THOMSON Microelectronics. 1998 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. L6223 33/33 ...

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