L6229Q STMicroelectronics, L6229Q Datasheet - Page 11

• Manufacturer Part Number: L6229Q
• Description: Motor / Motion / Ignition Controllers & Drivers DMOS Driver for 3-phase DC motor
• Manufacturer: STMicroelectronics
• Type: 3 Phase Brushless DC Motor Controllerr

Specifications of L6229Q

• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 8V
• Operating Supply Voltage (max): 52V
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 8 V to 52 V
• Supply Current: 3.55 A
• Mounting Style: SMD/SMT
• Package / Case: VQFN-32
• Operating Temperature: + 150 C
• Lead Free Status / RoHS Status: Compliant

L6229Q
5
5.1
Circuit description
Power stages and charge pump
The L6229Q integrates a three-phase bridge, which consists of 6 power MOSFETs
connected as shown on the block diagram (see
R
patterns are generated by the PWM current controller and the hall effect sensor decoding
logic (see relative paragraph 3.3 and 3.5). Cross conduction protection is implemented by
using a dead time (t
and turn on of two power MOSFETs in one leg of a bridge.
Pins VS
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 (V
through an internal oscillator and few external components to realize a charge pump circuit
as shown in
with 10 V amplitude. Recommended values/part numbers for the charge pump circuit are
shown in
Table 7.
Figure 5.
DS(ON)
A
= 0.73 Ω (typical value @ 25 °C) with intrinsic fast freewheeling diode. Switching
Table
and VS
Figure
Charge pump external component values
Charge pump circuit
Component
7.
C
B
BOOT
C
D1
D2
must be connected together to the supply voltage (V
5. The oscillator output (pin VCP) is a square wave at 600 kHz (typically)
P
DT
= 1 µs typical value) set by internal timing circuit between the turn off
VCP
Doc ID 15209 Rev 3
D1
C
P
D2
VBOO T
C
BOO T
VS
Figure
A
VS
B
1). each power MOS has an
D01IN1328
1N4148
1N4148
220 nF
Value
10 nF
V
S
BOOT
Circuit description
S
).
) is obtained
11/28