L6226Q STMicroelectronics, L6226Q Datasheet - Page 12

• Manufacturer Part Number: L6226Q
• Description: IC DRIVER FULL BRG DUAL 32VFQFPN
• Manufacturer: STMicroelectronics
• Type: H Bridger

Specifications of L6226Q

• Input Type: Non-Inverting
• Number Of Outputs: 4
• On-state Resistance: 730 mOhm
• Current - Output / Channel: 1.4A
• Current - Peak Output: 2.8A
• Voltage - Supply: 8 V ~ 52 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, 32-VFQFPN
• Product: H-Bridge Drivers
• Rise Time: 250 ns
• Fall Time: 250 ns
• Supply Voltage (min): 8 V
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Bridge Type: Full Bridge
• Maximum Turn-on Delay Time: 1900 ns
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 2
• For Use With: 497-6816 - EVAL BOARD FOR L6226Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Circuit description
4.3
4.4
12/29
Truth table
Table 7.
1. X = Don't care
2. High Z = High impedance output
Non-dissipative overcurrent detection and protection
An overcurrent detection circuit (OCD) is integrated. This circuit can be used to provides
protection against a short circuit to ground or between two phases of the bridge as well as a
roughly regulation of the load current. With this internal over current detection, the external
current sense resistor normally used and its associated power dissipation are eliminated.
Figure 9
bridge B is provided of an analogous circuit.
To implement the over current detection, a sensing element that delivers a small but precise
fraction of the output current is implemented with each high side power MOS. Since this
current is a small fraction of the output current there is very little additional power
dissipation. This current is compared with an internal reference current I
output current reaches the detection threshold Isover the OCD comparator signals a fault
condition. When a fault condition is detected, an internal open drain MOS with a pull down
capability of 4 mA connected to OCD pin is turned on.
This signal can be used to regulate the output current simply by connecting the OCD pin to
EN pin and adding an external R-C as shown in
normal operation can be easily programmed by means of the accurate thresholds of the
logic inputs.
I
following the equations:
●
●
Figure 11
to 40 kΩ.
The disable time t
means of the accurate thresholds of the logic inputs. It is affected whether by C
REF
and, therefore, the output current detection threshold are selectable by R
Isover = 2.8 A ± 30 % at -25 °C < T
(PROGCL connected to GND)
Isover =
EN
H
H
H
H
L
shows a simplified schematic of the overcurrent detection circuit for the bridge A.
shows the output current protection threshold versus R
Truth table
11050
--------------- -
R
DISABLE
CL
±10 % at -25 °C < T
Inputs
X
IN1
before recovering normal operation can be easily programmed by
H
H
L
L
(1)
Doc ID 14335 Rev 5
J
< 125 °C if R
IN2
J
X
H
H
L
L
< 125 °C if 5 kΩ < R
Figure
Figure 10
CL
9. The off time before recovering
= 0 Ω
High Z
OUT1
GND
GND
Vs
Vs
shows the OCD operation.
CL
CL
(2)
value in the range 5 kΩ
< 40 kΩ
Outputs
REF
. When the
CL
EN
High Z
OUT2
GND
GND
value,
Vs
Vs
and R
L6226Q
EN