L6208N STMicroelectronics, L6208N Datasheet - Page 16

IC DRIVER STEPPER MOTOR 24PWRDIP

L6208N

Manufacturer Part Number
L6208N
Description
IC DRIVER STEPPER MOTOR 24PWRDIP
Manufacturer
STMicroelectronics
Type
Driverr
Datasheet

Specifications of L6208N

Applications
Stepper Motor Driver, 2 Phase
Number Of Outputs
2
Current - Output
5.6A
Voltage - Supply
8 V ~ 52 V
Operating Temperature
-25°C ~ 125°C
Mounting Type
Through Hole
Package / Case
24-DIP (0.300", 7.62mm)
Operating Supply Voltage
8 V to 52 V
Supply Current
0.01 A
Mounting Style
Through Hole
Motor Type
Stepper
No. Of Outputs
4
Output Current
7.1A
Output Voltage
52V
Supply Voltage Range
8V To 52V
Driver Case Style
DIP
No. Of Pins
24
Rohs Compliant
Yes
For Use With
497-5488 - EVAL BOARD FOR L6208N DIP497-4136 - EVAL BOARD FOR L6208 SERIES
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Load
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-5342-5
L6208N

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L6208
Figure 18. Wave Drive Mode
NON-DISSIPATIVE OVERCURRENT PROTECTION
The L6208 integrates an Overcurrent Detection Circuit (OCD). This circuit provides protection against a short
circuit to ground or between two phases of the bridge. With this internal over current detection, the external cur-
rent sense resistor normally used and its associated power dissipation are eliminated. Figure 19 shows a sim-
plified schematic of the overcurrent detection circuit.
To implement the over current detection, a sensing element that delivers a small but precise fraction of the out-
put current is implemented with each high side power MOS. Since this current is a small fraction of the output
current there is very little additional power dissipation. This current is compared with an internal reference cur-
rent I
a fault condition. When a fault condition is detected, the EN pin is pulled below the turn off threshold (1.3V typ-
ical) by an internal open drain MOS with a pull down capability of 4mA. By using an external R-C on the EN pin,
the off time before recovering normal operation can be easily programmed by means of the accurate thresholds
of the logic inputs.
Figure 19. Overcurrent Protection Simplified Schematic
16/27
C or LOGIC
V
DD
REF
. When the output current reaches the detection threshold (typically 5.6A) the OCD comparator signals
R
C
EN
EN
.
.
EN
Start Up or Reset
40 TYP.
R
DS(ON)
3
2
1
TO GATE
LOGIC
4
8
OPEN-DRAIN
INTERNAL
POWER SENSE
COMPARATOR
5
6
7
D01IN1321
COMPARATOR
1 cell
OCD
OCD
CLOCK
I
I
OUTA
OUTB
POWER DMOS
OVER TEMPERATURE
n cells
2
4
6
OUT1
I
1A
FROM THE
BRIDGE B
8
/ n
(I
1A
I
A
REF
2
I
1A
+I
VS
2A
4
+
) / n
A
I
2A
6
OUT2
8
I
2A
POWER DMOS
A
/ n
n cells
HIGH SIDE DMOSs OF
THE BRIDGE A
D01IN1337
POWER SENSE
1 cell

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