STMicroelectronics Demonstration board using a dual full-bridge L6227Q EVAL6227QR EVAL6227QR Fiche De Données
Codes de produits
EVAL6227QR
L6227Q
Circuit description
11/27
4.2 Logic
inputs
Pins IN1
A
, IN2
B
, IN1
B
and IN2
B
are TTL/CMOS and microcontroller compatible logic inputs.
The internal structure is shown in
. Typical value for turn-on and turn-off thresholds
are respectively Vthon = 1.8 V and Vthoff = 1.3 V.
Pins EN
A
and EN
B
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 EN
bridge B) are also connected to these pins. Due to these connections some care needs to
be taken in driving these pins. The EN
A
and EN
B
inputs may be driven in one of two
. If driven by an open drain (collector)
structure, a pull-up resistor R
EN
and a capacitor C
EN
are connected as shown in
. If
the driver is a standard push-pull structure the resistor R
EN
and the capacitor C
EN
are
connected as shown in
. The resistor R
EN
should be chosen in the range from
2.2 k
Ω to 180 kΩ. Recommended values for R
EN
and C
EN
are respectively 100 k
Ω 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.
EN
A
and EN
B
pins open collector driving
Figure 8.
EN
A
and EN
B
pins push-pull driving
5V
D01IN1329
ESD
PROTECTION
5V
5V
OPEN
COLLECTOR
OUTPUT
R
EN
C
EN
EN
D01IN1330
ESD
PROTECTION
5V
PUSH-PULL
OUTPUT
R
EN
C
EN
EN
D01IN1331
ESD
PROTECTION