L6460 STMicroelectronics, L6460 Datasheet - Page 63

• Manufacturer Part Number: L6460
• Description: MOSFET & Power Driver ICs SPI Config Stepper DC Multi Motor DRV
• Manufacturer: STMicroelectronics
• Type: Full-Bridge Driverr

Specifications of L6460

• Product: Half-Bridge Drivers
• Rise Time: 0.4 us
• Fall Time: 0.4 us
• Supply Voltage (max): 38 V
• Supply Voltage (min): 13 V
• Supply Current: 11 mA
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 4
• Output Current: 10 mA
• Output Voltage: 30 V
• Package / Case: TQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6460
14.1.4
Note:
14.1.5
Switch configuration
Each bridge can be configured to be used as 2 independent switches that connects the
output to supply or to ground. It is also possible to parallel the two switches and use them as
a single super switch.
All resulting switches will behave according to the following truth table.
Table 20.
When “low power mode” bit is active the bridge will reduce its biasing thus contributing to the
whole power saving.
When a current limit event occurs this event will be latched and the bridge will remain in high
impedance state for the toff time.
Bipolar stepper configuration
The bridges 3 and 4 can be configured to be used as a micro-stepping, bidirectional driver
for bipolar stepper motors.
The primary features of the driver are the following:
Each H-bridge is controlled with a fixed and selectable off-time PWM current control circuit
that limits the load current to a value set by choosing V
internal DAC and an the external R
The max current level could be calculated using the formula:
To obtain the best current profile, the user can choose three different current decay modes:
slow, fast and mixed. Initially, during Ton, a diagonal pair of source and sink power MOS is
enabled and current flows through the motor winding and the sense resistor. When the
voltage across the sense resistor reaches the programmed DAC output voltage, the control
logic will change the status of the bridge according to the selected decay mode (slow, fast or
mixed). In slow decay mode the current is recirculated through the path including both high
TSD
–
–
–
1
0
0
0
0
0
0
0
Internal PWM current control.
Micro stepping.
Fast, mixed and slow current decay modes.
Switch truth table
nReset
X
0
1
1
1
1
1
1
power
mode
Low
X
X
1
0
0
0
0
0
Doc ID 17713 Rev 1
I
MAX
SENSE
Enable
=V
X
X
X
0
1
1
1
1
STEPREF
value.
Current
limit
/R
X
X
X
X
0
0
0
1
SENSE
STEPREF
MtrXCtrl
SideA/B
X
X
X
X
0
1
1
X
voltage by means of the
PWM
X
X
X
X
X
X
0
1
Power bridges
OUT
Z
Z
Z
Z
Z
1
0
Z
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