L6228QTR STMicroelectronics, L6228QTR Datasheet - Page 11

• 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
4.1
Circuit description
Power stages and charge pump
The L6228Q integrates two independent power MOS full bridges. Each power MOS has an
R
patterns are generated by the PWM Current Controller and the Phase Sequence Generator
(see below). Cross conduction protection is achieved using a dead time (t
value) between the switch off and switch on of two power MOSFETs in one leg of a bridge.
Pins VS
operates with a supply voltage in the range from 8 V to 52 V. It has to be noticed that the
R
12 V.
Using N-channel power MOS for the upper transistors in the bridge requires a gate drive
voltage above the power supply voltage. The bootstrapped supply voltage V
through an internal Oscillator and few external components to realize a charge pump circuit
as shown in
10V amplitude. Recommended values/part numbers for the charge pump circuit are shown
in
Table 6.
Figure 8.
DS(on)
DS(on)
Table
= 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Switching
increases of some percents when the supply voltage is in the range from 8 V to
A
6.
and VS
Figure
Charge pump external components values
Charge pump circuit
Component
C
B
BOOT
C
D1
D2
must be connected together to the supply voltage V
8. The oscillator output (VCP) is a square wave at 600 kHz (typical) with
P
VCP
Doc ID 14321 Rev 4
D1
C
P
D2
VBOO T
C
BOO T
VS
A
VS
B
D01IN1328
1N4148
1N4148
220 nF
Value
10 nF
V
S
S
Circuit description
. The device
DT
= 1 μs typical
BOOT
is obtained
11/32