EVAL6226QR STMicroelectronics, EVAL6226QR Datasheet - Page 10

• Manufacturer Part Number: EVAL6226QR
• Description: EVAL BOARD FOR L6226Q
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of EVAL6226QR

• Mfg Application Notes: EVAL6226QR AppNote
• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: L6226Q
• Primary Attributes: Stepper, Bi-Polar/2-Phase, 1A DC, 8 ~ 52V Output
• Secondary Attributes: Thermal Protection, Internal Free Wheeling Diodes
• Board Size: 27 mm x 24.5 mm
• Maximum Operating Temperature: + 125 C
• Operating Supply Voltage: 8 V to 52 V
• Product: Power Management Modules
• Dimensions: 27 mm x 24.5 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6226Q
• Other names: 497-6816

Circuit description
4
4.1
10/29
Circuit description
Power stages and charge pump
The L6226Q integrates two independent power MOS full bridges. Each power MOS has an
R
conduction protection is achieved using a dead time (td = 1 μs typical) between the switch
off and switch on of two power MOS in one leg of a bridge.
Using N-channel power MOS for the upper transistors in the bridge requires a gate drive
voltage above the power supply voltage. The bootstrapped (VBOOT) supply is obtained
through an internal oscillator and few external components to realize a charge pump circuit
as shown in
10 V amplitude. Recommended values/part numbers for the charge pump circuit are shown
in
Table 6.
Figure 5.
C
C
D1
D2
DS(on)
BOOT
P
Table
= 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Cross
6.
Figure
Charge pump external components values
Charge pump circuit
Component
5. The oscillator output (VCP) is a square wave at 600 kHz (typical) with
Doc ID 14335 Rev 5
220 nF
10 nF
1N4148
1N4148
Value
L6226Q