L6229DTR STMicroelectronics, L6229DTR Datasheet - Page 9
![IC DRIVER 3PHASE DC MOTOR 24SOIC](/photos/6/88/68802/497-24-soic__7_5mm_width__series_sml.jpg)
L6229DTR
Manufacturer Part Number
L6229DTR
Description
IC DRIVER 3PHASE DC MOTOR 24SOIC
Manufacturer
STMicroelectronics
Type
Driverr
Datasheet
1.L6229DTR.pdf
(25 pages)
Specifications of L6229DTR
Applications
DC Motor Driver, Brushless (BLDC), 3 Phase
Number Of Outputs
1
Current - Output
2.8A
Voltage - Supply
12 V ~ 52 V
Operating Temperature
-40°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Operating Supply Voltage
8 V to 52 V
Supply Current
1.4 A
Mounting Style
SMD/SMT
For Use With
497-5491 - EVAL BOARD FOR L6229PD SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Load
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-4008-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L6229DTR
Manufacturer:
STMicroelectronics
Quantity:
1 924
L6229
Figure 7. Logic Input Internal Structure
5V
ESD
PROTECTION
D01IN1329
Figure 8. Pin EN Open Collector Driving
DIAG
5V
5V
R
EN
OPEN
COLLECTOR
EN
OUTPUT
C
EN
ESD
PROTECTION
D02IN1378
Figure 9. Pin EN Push-Pull Driving
DIAG
5V
R
EN
PUSH-PULL
EN
OUTPUT
C
EN
ESD
PROTECTION
D02IN1379
3.3 PWM CURRENT CONTROL
The L6229 includes a constant off time PWM Current Controller. The current control circuit senses the bridge
current by sensing the voltage drop across an external sense resistor connected between the source of the
three lower power MOS transistors and ground, as shown in Figure 10. As the current in the motor increases
the voltage across the sense resistor increases proportionally. When the voltage drop across the sense resistor
becomes greater than the voltage at the reference input pin VREF the sense comparator triggers the
monostable switching the bridge off. The power MOS remain off for the time set by the monostable and the mo-
tor current recirculates around the upper half of the bridge in Slow Decay Mode as described in the next section.
When the monostable times out, the bridge will again turn on. Since the internal dead time, used to prevent
cross conduction in the bridge, delays the turn on of the power MOS, the effective Off Time t
is the sum of
OFF
the monostable time plus the dead time.
Figure 11 shows the typical operating waveforms of the output current, the voltage drop across the sensing re-
sistor, the pin RC voltage and the status of the bridge. More details regarding the Synchronous Rectification and
the output stage configuration are included in the next section.
Immediately after the Power MOS turn on, a high peak current flows through the sense resistor due to the re-
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