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PDF ( 数据手册 , 数据表 ) L6208

零件编号 L6208
描述 FULLY INTEGRATED STEPPER MOTOR DRIVER
制造商 STMicroelectronics
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L6208 数据手册, 描述, 功能
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February 2014
This is information on a product in full production.
L6208
DMOS driver for bipolar stepper motor
Datasheet - production data
Features
Operating supply voltage from 8 to 52 V
5.6 A output peak current (2.8 A RMS)
RDS(ON) 0.3 typ. value at Tj = 25 °C
Operating frequency up to 100 KHz
Non-dissipative overcurrent protection
Dual independent constant tOFF PWM current
controllers
Fast/slow decay mode selection
Fast decay quasi-synchronous rectification
Decoding logic for stepper motor full and half
step drive
Cross conduction protection
Thermal shutdown
Undervoltage lockout
Integrated fast freewheeling diodes
Applications
Bipolar stepper motor
Description
The L6208 device is a DMOS fully integrated
stepper motor driver with non-dissipative
overcurrent protection, realized in BCD
technology, which combines isolated DMOS
power transistors with CMOS and bipolar circuits
on the same chip. The device includes all the
circuitry needed to drive a two phase bipolar
stepper motor including: a dual DMOS full bridge,
the constant off time PWM current controller that
performs the chopping regulation and the phase
sequence generator, that generates the stepping
sequence. Available in PowerDIP24 (20 + 2 + 2),
PowerSO36 and SO24 (20 + 2 + 2) packages, the
L6208 device features a non-dissipative
overcurrent protection on the high-side Power
MOSFETs and thermal shutdown.
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L6208 pdf, 数据表
Electrical characteristics
4 Electrical characteristics
L6208
Symbol
Table 5. Electrical characteristics
(Tamb = 25 °C, Vs = 48 V, unless otherwise specified)
Parameter
Test conditions
Min. Typ. Max. Unit
VSth(ON) Turn-on threshold
VSth(OFF) Turn-off threshold
IS Quiescent supply current
Tj(OFF) Thermal shutdown temperature
Output DMOS transistors
All bridges OFF;
Tj = -25 °C to 125 °C(1)
6.6 7 7.4 V
5.6 6 6.4 V
5 10 mA
165 C
RDS(ON)
High-side switch ON resistance
Low-side switch ON resistance
IDSS Leakage current
Tj = 25 °C
Tj = 125 °C(1)
Tj = 25 °C
Tj =125 °C(1)
EN = low; OUT = VS
EN = low; OUT = GND
0.34
0.53
0.28
0.47
-0.15
0.4
0.59
0.34
0.53
2
W
W
W
W
mA
mA
Source drain diodes
VSD Forward ON voltage
trr Reverse recovery time
tfr Forward recovery time
ISD = 2.8 A, EN = LOW
If = 2.8 A
Logic inputs (EN, CONTROL, HALF/FULL, CLOCK, RESET, CW/CCW)
1.15 1.3
300
200
V
ns
ns
VIL
VIH
IIL
IIH
Vth(ON)
Vth(OFF)
Vth(HYS)
Low level logic input voltage
High level logic input voltage
Low level logic input current
High level logic input current
Turn-on input threshold
Turn-off input threshold
Input threshold hysteresis
Switching characteristics
GND logic input voltage
7 V logic input voltage
-0.3 0.8 V
2 7V
-10 µA
10 µA
1.8 2.0 V
0.8 1.3
V
0.25 0.5
V
tD(ON)EN
tD(OFF)EN
tRISE
tFALL
tDCLK
tCLK(min)L
Enable to output turn-on delay time(2)
Enable to output turn-off delay time(2)
Output rise time(2)
Output fall time(2)
Clock to output delay time(3)
Minimum clock time(4)
ILOAD = 2.8 A, resistive load
ILOAD = 2.8 A, resistive load
ILOAD = 2.8 A, resistive load
ILOAD = 2.8 A, resistive load
ILOAD = 2.8 A, resistive load
100 250 400
300 550 800
40 250
40 250
2
1
ns
ns
ns
ns
µs
µs
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L6208 equivalent, schematic
PWM current control
L6208
Therefore:
Equation 3
tOFF(MIN) = 6.6 µs
tOFF(MAX) = 6 ms
These values allow a sufficient range of tOFF to implement the drive circuit for most motors.
The capacitor value chosen for COFF also affects the rise time tRCRISE of the voltage at the
pin RCOFF. The rise time tRCRISE will only be an issue if the capacitor is not completely
charged before the next time the monostable is triggered. Therefore, the on time tON, which
depends by motors and supply parameters, has to be bigger than tRCRISE for allowing
a good current regulation by the PWM stage. Furthermore, the on time tON can not be
smaller than the minimum on time tON(MIN).
Equation 4
tON > tONMIN= 1.5s (typ. value)
tON > tRCRISE tDT
tRCRISE = 600 · COFF
Figure 15 shows the lower limit for the on time tON for having a good PWM current
regulation capacity. It has to be said that tON is always bigger than tON(MIN) because the
device imposes this condition, but it can be smaller than tRCRISE - tDT. In this last case the
device continues to work but the off time tOFF is not more constant.
So, small COFF value gives more flexibility for the applications (allows smaller on time and,
therefore, higher switching frequency), but, the smaller is the value for COFF, the more
influential will be the noises on the circuit performance.
Figure 14. tOFF versus COFF and ROFF
 
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DocID7514 Rev 2

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