L6228QTR STMicroelectronics, L6228QTR Datasheet - Page 19

• Manufacturer Part Number: L6228QTR
• Description: IC DVR BIPO STEP MOTOR 32-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Bipolar Stepper Motor Driverr

Specifications of L6228QTR

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: 1.4A
• Voltage - Supply: 8 V ~ 52 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, 32-VFQFPN
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 48 V
• For Use With: 497-6818 - EVAL BOARD FOR L6228Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-6864-2; L6228QTR

L6228Q
4.9
Figure 20. Wave drive mode
Non-dissipative overcurrent protection
The L6228Q integrates an overcurrent detection circuit (OCD) for full protection. This circuit
provides protection against a short circuit to ground or between two phases of the bridge.
With this internal over current detection, the external current sense resistor normally used
and its associated power dissipation are eliminated.
of the overcurrent detection 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 (typically 2.8 A) the OCD comparator signals
a fault condition. When a fault condition is detected, the EN pin is pulled below the turn off
threshold (1.3 V typical) by an internal open drain MOS with a pull down capability of 4 mA.
By using an external R-C on the EN pin, the off time before recovering normal operation can
be easily programmed by means of the accurate thresholds of the logic inputs.
Start Up or Reset
3
2
1
4
8
Doc ID 14321 Rev 4
5
6
7
D01IN1321
CLOCK
I
I
OUTA
OUTB
2
4
6
Figure 21
8
2
shows a simplified schematic
4
6
8
Circuit description
REF
. When the
19/32