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參數(shù)資料
| 型號： | L6258EA |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2 A, PDSO36 |
| 封裝： | POWER, SO-36 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 214K |
| 代理商： | L6258EA |
17/23
L6258EA
5
APPLICATION INFORMATION
A typical application circuit is shown in Fig. 13.
Note: For avoid current spikes on falling edge of DISABLE a "DC feedback" would be added to the ERROR
Amplifier. (R1-R2 on Fig. 13).
5.1 Interference
Due to the fact that the circuit operates with switch mode current regulation, to reduce the effect of the wiring
inductance a good capacitor (100nF) can be placed on the board near the package, between the power supply
line (pin 13,31) and the power ground (pin 1,36,18,19) to absorb the small amount of inductive energy.
It should be noted that this capacitor is usually required in addition to an electrolytic capacitor, that has poor
performance at the high frequencies, always located near the package, between power supply voltage (pin
13,31) and power ground (pin 1,36,18,19), just to have a current recirculation path during the fast current decay
or during the phase change.
The range value of this capacitor is between few
F and 100F, and it must be chosen depending on application
parameters like the motor inductance and load current amplitude.
A decoupling capacitor of 100nF is suggested also between the logic supply and ground.
The EA_IN1 and EA_IN2 pins carry out high impedance lines and care must be taken to avoid coupled noise on this
signals. The suggestion is to put the components connected to this pins close to the L6258EA, to surround them with
ground tracks and to keep as far as possible fast switching outputs of the device. Remember also an 1 Mohm resistor
between EA_INx and EA_OUTx to avoid output current spike during supply startup/shutdown.
A non inductive resistor is the best way to implement the sensing. Whether this is not possible, some metal film
resistor of the same value can be paralleled.
The two inputs for the sensing of the winding motor current (SENSE_A & SENSE_B) should be connected di-
rectly on the sensing resistor Rs terminals, and the path lead between the Rs and the two sensing inputs should
be as short as possible.
Figure 13. Typical Application Circuit.
STEPPER
MOTOR
M
12mH 10
0.33
21
20
14
35
34
5
OUT2B
SENSE2
OUT2A
SENSE1
OUT1B
OUT1A
PH1
2
I0_1
4
I1_1
3
I2_1
32
I3_1
33
PH2
17
I0_2
15
I1_2
16
I2_2
23
I3_2
22
DISABLE
6
10nF
100nF
1nF
TRI_CAP
7
VS
13,31
VBOOT
12
VCP2
11
VCP1
10
9
GND
1,36
18,19
PWR_GND
VS
27
SIG_GND
28
D97IN626E
VREF1
26
VREF2
29
EA_IN1
30
EA_OUT1
820pF
1M
25
EA_IN2
24
EA_OUT2
820pF
1M
VREF
8
VDD
VDD(5V)
L6258
SOP36
PACKAGE
R2 1M
R1 1M
EA
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