- 您现在的位置：买卖IC网 > PDF目录97995 > L6238SQT (STMICROELECTRONICS) BRUSHLESS DC MOTOR CONTROLLER, 5 A, PQFP64 PDF资料下载
参数资料
| 型号： | L6238SQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 5 A, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 19/31页 |
| 文件大小： | 3465K |
| 代理商： | L6238SQT |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
sufficient
response,
commensurate
with
the
switching speed of the output drivers. At higher
frequencies the switching losses inherent in the
drivers start to negative any of the power dissipa-
tion savings gained with PWM operation.
The current sense amplifier has a minimum slew
rate of 0.31V/
s. With a worst case Motor peak
start-up current of 2.5A and Sense Resistor of
0.33, the resultant Rsense voltage would be equal
to 825mV. With a minimum gain of 3.8V/V, the
CSA output voltage would have to slew to 3.14V.
Therefore it would require approximately 10
s for
the output voltage to reach the required com-
manded level.
If an ON time were selected that was less than
this time, the motor current would overshoot the
desired level resulting in incorrect current control
possibly exceeding the output capabilities of the
drivers.
5.1.5 Noise Blanking
Referring to Figure 5-8, when operating with
lower levels of current (i.e. < 700mA, with Rsense
= 0.33
), the possibility exiss where the noise
due to output Turn-ON can exceed the Com-
manded Current Level causing prematire Turn-
OFF.
In order to provide noise immunity from this
switching noise, a blanking circuit automatically
rejects any signal appearing at the output of the
CSA for a 3
s period.
Figure 5-9 is an additional block diagram of the
PWM control loop including the noise blanking cir-
cuit. The output of A3 goes high when ever the
voltage at the CSA input is more positive then the
Control Voltage.
This is the case when either the motor current or
the turn-ON transient has reached the com-
manded level. The output of A3 is gates by N11.
In order to provide a blanking period, Q1 is turned
10
s/DIV
Vrsense
D95IN325
1
3
s BLANKING PULSE
COMMANDED
CURRENT LEVEL
Figure 5-8
C1
8pF
Q1
N6
N10
I1
5
A
N1
DELAY
TO OUPUT
DRIVERS
N7
N8
N11
N9
N12
2.4V
SW1
A2
+
-
1.2V
A3
+
-
N4
N2
N3
CLK_BEMF
N5
I2
20
A
Q2
X4
PWM/LIN
RUN/BRAKE
N12
Q3
PWM TIMER
C4
PWM COMP
VCONTROL
CSA INPUT
PWM_SLEW
C3
R1
D95IN326
Figure 5-9
L6238S
26/31
相关PDF资料 |
PDF描述 |
|---|---|
| L6238S013TR | BRUSHLESS DC MOTOR CONTROLLER, 5 A, PQCC44 |
| L6246 | VOICE COIL MOTOR CONTROLLER, 3 A, PQFP44 |
| L6258EA | STEPPER MOTOR CONTROLLER, 2 A, PDSO36 |
| L6268 | VOICE COIL MOTOR CONTROLLER, 2.1 A, PQFP44 |
| L6269 | VOICE COIL MOTOR CONTROLLER, 2.1 A, PQFP44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6239 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| L623C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T) |
| L623F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T) |
| L624 | 制造商:CRYDOM 制造商全称:Crydom Inc., 功能描述:Power Modules |
| L6242 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:VOICE COIL MOTOR DRIVER |
发布紧急采购，3分钟左右您将得到回复。