參數(shù)資料
型號(hào)： L8229
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 1.5 A, PDSO24
封裝： LEAD FREE, SSO-24
文件頁(yè)數(shù)： 8/42頁(yè)
文件大?。?/td> 858K
代理商： L8229
Obsolete
Product(s)
- Obsolete
Product(s)
L6219_HI mode
L8229
Note that Iout max is 1.2A and the wide range allowed for Vref requires the choice of a
suitable sense resistor to prevent current range over the maximum.
6.4
Single-pulse Generator
The pulse generator is a monostable circuit triggered on the positive going edge of the
comparator output. The circuit output is high during the pulse time Toff that is determined by
the time components Rt and Ct.
Toff =~ 1.1 x RtCt
(including switching dead time)
The single pulse turns off the power switch connected to the motor winding, causing the
winding current to decrease during Toff. If a new trigger signal should occur during Toff it will
be ignored.
6.5
Output Stage
Each of the two outputs stage contains four LDMOS transistors (P and N channel)
connected in two H Bridges. The intrinsic body diode of the LDMOS serve as recirculation
diode for flyback current.
The LDMOS are used to switch the power supply to the motor winding, thus driving a
constant current through the winding. It should be noted however, that is not permitted to
short-circuit the outputs. Internal circuitry is added in order to increase the accuracy of the
motor current particularly with low current levels.
6.6
Vs, Vcc, Vref
The circuit will stand any order of turn-on or turn-off of the supply voltages Vs and Vcc.
Normal dV/dt values are then assumed.
Preferably, Vref should be tracking Vcc during power-on and power-off if Vs is established.
Figure 3.
Ton and Toff
Normalized
output current
Ton
Toff
Tdelay
VSense
Vref
VRC
0.5
0
1.0
Normalized
output current
Ton
Toff
Tdelay
VSense
Vref
VRC
0.5
0
1.0
Ton
Toff
Tdelay
VSense
Vref
VRC
0.5
0
1.0
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