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L6227Q Fiches technique(PDF) 11 Page - STMicroelectronics

No de pièce L6227Q
Description  DMOS dual full bridge driver with PWM current controller
Download  27 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6227Q Fiches technique(HTML) 11 Page - STMicroelectronics

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L6227Q
Circuit description
11/27
4.2
Logic inputs
Pins IN1A, IN2B, IN1B and IN2B are TTL/CMOS and microcontroller compatible logic inputs.
The internal structure is shown in Figure 6. Typical value for turn-on and turn-off thresholds
are respectively Vthon = 1.8 V and Vthoff = 1.3 V.
Pins ENA and ENB have identical input structure with the exception that the drains of the
Overcurrent and thermal protection MOSFETs (one for the bridge A and one for the
bridge B) are also connected to these pins. Due to these connections some care needs to
be taken in driving these pins. The ENA and ENB inputs may be driven in one of two
configurations as shown in Figure 7 or Figure 8. If driven by an open drain (collector)
structure, a pull-up resistor REN and a capacitor CEN are connected as shown in Figure 7. If
the driver is a standard push-pull structure the resistor R
EN and the capacitor CEN are
connected as shown in Figure 8. The resistor R
EN should be chosen in the range from
2.2 k
Ω to 180 kΩ. Recommended values for R
EN and CEN are respectively 100 kΩ and 5.6 nF.
More information on selecting the values is found in the overcurrent protection section.
Figure 6.
Logic inputs internal structure
Figure 7.
ENA and ENB pins open collector driving
Figure 8.
ENA and ENB pins push-pull driving
5V
D01IN1329
ESD
PROTECTION
5V
5V
OPEN
COLLECTOR
OUTPUT
REN
CEN
EN
D01IN1330
ESD
PROTECTION
5V
PUSH-PULL
OUTPUT
REN
CEN
EN
D01IN1331
ESD
PROTECTION


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