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PDF L6285 Data sheet ( Hoja de datos )

Número de pieza L6285
Descripción 3 CHANNELS MULTIPOWER SYSTEM
Fabricantes STMicroelectronics 
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L6285
3 CHANNELS MULTIPOWER SYSTEM
ADVANCE DATA
CHANNEL-A AND CHANNEL-B FOR UNIPO-
LAR STEPPER MOTORS
– LOW SIDE: RDSON = 1.2
– HIGH SIDE ; RDSON = 1.2
CHANNEL-C FOR DC MOTORS
– LOW SIDE: RDSON = 1.7
– HIGH SIDE: RDSON = 1.2
CHOPPING MODE DRIVING FOR C.L. CUR-
RENT CONTROL ON CHA AND CHB AND
O.L. VOLTAGE CONTROL ON CHC.
INTERNAL FOUR DRIVING LATCHES
16 BIT INTERNAL SHIFT REGISTER
DIRECT INTERFACE TO µP
SERIAL DRIVING SEQUENCE LOADING
CMOS COMPATIBLE INPUTS
PRE-ALARM OUTPUT SIGNAL
THERMAL SHUTDOWN
DESCRIPTION
This Combo Motor Driver uses large scale inte-
gration to incorporate several functions into the
same chip.
1) Two unipolar stepper motor driver
2) A full bridge DC motor driver
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
PLCC44
SDIP42
ORDERING NUMBERS:
L6285
L6285S
3) Serial microprocesor interface
The power output stages are DMOS and the input
can be interfaced to a CMOS Microprocessor
logic.
The phase current in the unipolar stepper motor
windings is controlled by two external sensing re-
sistors in fixed frequency chopping mode. The os-
cillator block provides clocks each other 180° out
of phase to the two stepper motor driver in order
to avoid symultaneous current peaks.
For the DC motor driver is used a bridge; the
RMS voltage to supply this motor is fixed by a
May 1994
1/16
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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L6285 pdf
ELECTRICAL CHARACTERISTICS (continued)
OSCILLATOR (see Fig. 6)
Symbol
fosc
Tdsc
Vreset
Parameter
Oscillator Frequency
Pin OSC/RESET
Capacitor Discharge Time
(protect dead time)
Reset Threshold Voltage
Test Conditions
COSC = 3.3nF; ROSC = 10K
COSC = 3.3nF; ROSC = 10K
(see Fig. 1)
L6285
Min.
27
0.8
1
Typ.
41
1.4
Max.
46
2
Unit
KHz
µs
V
INTERFACE TIMING
Symbol
t1
t2
t3
t4
t5
Parameter
SCK Data Clock Cycle
SCK Data Set-upTime
SCK Data Hold Time
SCK-STB Interval Time
STB Pulse Width
Test Conditions
(see Fig. 2)
Note 1: No output loaded; all register to low condition; no reset applied; V P = 26.5V; V S = 5.5V
Note 2: The effect of the internal filter (RC Network) is not considered.
Figure 1: Discharge time tdsc or Protection Time
Min.
200
30
20
30
100
Typ.
Max.
Unit
ns
ns
ns
ns
ns
Figure 2: Interface Timing (Serial loading Mode)
Serial
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Input Data D15
D0
D3 D2 D1 D0 D3 D2 D1 D0 D3 D2 D1 D0 D3 D2 D1 D0
Register 4
Register 3
Register 2
Register 1
5/16

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L6285 arduino
Charge Pump
The charge pump circuitry generates the overvol-
tage needed to drive the gate of the high side out-
put DMOS power transistors.It is realized by us-
ing two external capacitors (C1 and C2) and two
integrated diodes that operate as a full wave recti-
Figure 7: Charge Pump Circuit
L6285
fier (see Fig. 7). The oscillator peak to peak out-
put voltage is stored by C2 and summed to the
Power Supply Voltage Vp..
The voltage present at the pin BOOT1, is then the
overvoltage needed to supply the gate of the high
side DMOS drivers.
THERMAL PROTECTION
The thermal protection shuts down the chip be-
fore it can reach a dangerous temperature.
Additional informations to the microprocessor are
available at the A0TH, A1TH pins.
A0TH
0
1
1
0
A1TH
0
0
1
1
THERMAL PROTECTION
OK
PREALARM
ALARM
NOT POSSIBLE
CIRCUIT STATUS
OPERATING
OPERATING
THERMAL SHUTDOWN
APPLICATION INFORMATION
A typical application circuit is shown in Fig.8. By
this application it is possible to drive two unipolar
stepper motors (M1,M2) and one DC motor (M3).
As it can be seen, only two external Zener diodes
(D1,D2) are needed to clamp the voltage tran-
sients generated by the stray inductance of the
motor windings. This is recommended when the
peak current is not more than three to four hun-
dred mAmps. For a power supply voltage of
VP=24V ±10%, D1=D2 must be 30V ±5%-1W
(1N4751A or equivalent). Both the VP and the VS
pins need bypass capacitors (C1,C2,C3); to sup-
ply the high-side DMOS (Source Transistors) at
pin.15 ,only two external capacitors (C4,C5) com-
plete the charge pump circuitry. The oscillator fre-
quency, that is twice the chopping frequency for
M1 and M2, is mainly defined by the network
R6C6:
fosc = [0.69 (Rch + Rdsc) Cosc ]-1 , where
Rch = R6 ; Rdsc = 600 ohm typ.
At the same time, the lockout duration (or protec-
tion window) needed for a correct chopping be-
havior, is given by :
Tlockout = 0.69 Rdsc Cosc
The shown values (fig.8) give a nominal fre-
quency a little bit more than 41KHz and a protec-
tion window of 1.4 µs roughly. The Schottky diode
D3 and the pull-up resistor R5 driven via an open-
collector transistor can generate the Reset func-
tion. The chopping current is sensed across R1
A/B; R2 A/B that must be of a not inductive type.
The DC motor PWM Open Loop Voltage Control
operates at a frequency defined by C7, charged
with a typical constant current source (I = 240
µA), up to V1 = 0.67 VS. Since the discharge
time is very short, it can be written :
fosc = I / Cosc V1, where Cosc = C7.
Tha values indicated in figure give a typical fre-
quency of about 22 KHz.
11/16

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