E-L6258EP STMICROELECTRONICS [STMicroelectronics], E-L6258EP Datasheet - Page 16

• Manufacturer Part Number: E-L6258EP
• Description: PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

L6258EP
5
A typical application circuit is shown in Fig. 11.
Note: For avoid current spikes on falling edge of DISABLE a "DC feedback" would be added to the ERROR
Amplifier. (R1-R2 on Fig. 11).
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 µF and 100µF, 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 L6258EP, 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 11. Typical Application Circuit.
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APPLICATION INFORMATION
VS
100nF
10nF
1nF
DISABLE
TRI_CAP
VBOOT
VCP1
VCP2
PH1
I0_1
I1_1
I2_1
I3_1
PH2
I0_2
I1_2
I2_2
I3_2
VS
EA_IN1
10
11
12
13,31
7
2
4
3
32
33
17
15
16
23
22
6
29
1M
EA_OUT1
R1 1M
820pF
30
L6258EP
PWSSO36
PACKAGE
EA_IN2
25
1M
EA_OUT2
R2 1M
820pF
18,19
1,36
24
21
20
14
35
34
27
28
26
5
9
8
OUT2B
SENSE2
OUT2A
SENSE1
OUT1B
OUT1A
GND
PWR_GND
V
SIG_GND
VREF1
VREF2
DD
0.33
0.33
D97IN626EP
V
VREF
M
DD
(5V)
STEPPER
MOTOR
12mH 10Ω