L6506D STMicroelectronics, L6506D Datasheet - Page 3

• Manufacturer Part Number: L6506D
• Description: IC CONTROL FOR STEP MOTOR 20SOIC
• Manufacturer: STMicroelectronics
• Type: Stepper Motor Controller/Driverr

Specifications of L6506D

• Applications: Stepper Motor Controller
• Number Of Outputs: 4
• Voltage - Supply: 4.5 V ~ 7 V
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 10 V
• Supply Current: 25 mA
• Mounting Style: SMD/SMT
• Operating Temperature: 150 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Operating Temperature: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-1437-5; 497-1437-5; 497-3652-5; E-L6506D

ELECTRICAL CHARACTERISTICS (continued)
COMPARATOR SECTION PERFORMANCE (Over Operating Temperature Range)
LOGIC SECTION (Over Operating Temperature Range - TTL compatible inputs & outputs)
OSCILLATOR
CIRCUIT OPERATION
The L6506 is intended for use with dual bridge driv-
ers, such as the L298, quad darlington arrays, such
as the L7150, quad DMOS array such as L6114-
L6115, or discrete power transistors to drive stepper
motors and other similar loads. The main function of
the device is to sense and control the current in each
of the load windings.
A common on-chip oscillator drives the dual chopper
and sets the operating frequency for the pulse width
modulated drive. The RC network on pin 1 sets the
operating frequency which is given by the equation
:
The oscillator provides pulses to set the two flip-
flops which in turn cause the outputs to activate the
drive. When the current in the load winding reaches
the programmed peak value, the voltage across the
sense resistor (R
responding comparator resets its flip-flop interrupt-
ing the drive current until the next oscillator pulse oc-
curs. The peak current in each winding is pro-
grammed by selecting the value of the sense resis-
Symbol
Symbol
Symbol
V
V
V
V
V
V
f
I
V
I
osc
OH
R
IO
thH
IO
OH
thL
IH
OL
IL
i
f =
Input Offset Voltage
Input Offset Curent
Input High Voltage
Input Low Voltage
Output High Voltage
Ouptut Low Voltage
Ouput Source Current - Outputs
1 - 4
Frequency Range
Lower Threshold Voltage
Higher Threshold Voltage
Internal Discharge Resistor
0.69 RC
1
sense
Parameter
Parameter
Parameter
) is equal to V
for R
10 K
ref
and the cor-
V
V
I
V
I
V
OH
OH
IN
CC
CC
CC
= 1.4V
= 400 A
= 4mA
= 4.75V
= 4.75V
= 4.75V
Test Condtions
Test Condtions
Test Condtions
tor and V
each chopper, each of the loads may be pro-
grammed independently allowing the device to be
used to implement microstepping of the motor.
Lower threshold of L6506’s oscillator is 1/3 V
per threshold is 2/3 V
sistor is 1 K
Ground noise problems in multiple configurations
can be avoided by synchronizing the oscillators.
This may be done by connecting the sync pins of
each of the devices with the oscillator output of the
master device and connecting the R/C pin of the un-
used oscillators to ground.
The equations for the active time of the sync pulse
(T2), the inactive time of the sync signal (T1) and the
duty cycle can be found by looking at the figure 1 and
are :
ref
T2 = 0.69 C1
. Since separate inputs are provided for
T1 = 0.69 R1 C1
DC =
Min.
30 %.
0.7
5
Min.
Min.
2.75
T1 + T2
2
2
CC
T2
0.33 V
0.66 V
and internal discharge re-
R1 + R
Typ.
R1 R
1
Typ.
Typ.
0.25
3.5
L6506 - L6506D
CC
CC
IN
IN
Max.
Max.
Max.
0.8
0.4
1.3
500
70
V
20
s
CC
Unit
Unit
Unit
KHz
mV
mA
nA
k
V
V
V
V
V
V
. Up-
(1)
(2)
(3)
3/8