參數(shù)資料
型號(hào)： L6208PD
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 5.6 A, PDSO36
封裝： POWER, SO-36
文件頁數(shù)： 13/27頁
文件大?。?/td> 462K
代理商： L6208PD
L6208
20/27
Output Current Capability and IC Power Dissipation
In Fig. 24, 25, 26 and 27 are shown the approximate relation between the output current and the IC power dis-
sipation using PWM current control driving a two-phase stepper motor, for different driving sequences:
– HALF STEP mode (Fig. 24) in which alternately one phase / two phases are energized.
– NORMAL DRIVE (FULL-STEP TWO PHASE ON) mode (Fig. 25) in which two phases are energized
during each step.
– WAVE DRIVE (FULL-STEP ONE PHASE ON) mode (Fig. 26) in which only one phase is energized at
each step.
– MICROSTEPPING mode (Fig. 27), in which the current follows a sine-wave profile, provided through
the Vref pins.
For a given output current and driving sequence the power dissipated by the IC can be easily evaluated, in order
to establish which package should be used and how large must be the on-board copper dissipating area to guar-
antee a safe operating junction temperature (125°C maximum).
Figure 24. IC Power Dissipation versus Output Current in HALF STEP Mode.
Figure 25. IC Power Dissipation versus Output Current in NORMAL Mode (full step two phase on).
No PWM
f
SW
= 30 kHz (slow decay)
Test Conditions:
Supply Voltage = 24V
I A
I B
IOUT
0
0.5
1
1.5
2
2.5
3
0
2
4
6
8
10
PD [W]
I OUT [A]
HALF STEP
No PWM
fSW = 30 kHz (slow decay)
Test Conditions:
Supply Volt age =24 V
I A
I B
IOUT
00.5
11.5
22.5
3
0
2
4
6
8
10
PD [W ]
I OUT [A ]
NORM AL DRIVE
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