L6227Q STMicroelectronics, L6227Q Datasheet - Page 10

• Manufacturer Part Number: L6227Q
• Description: IC DRIVER FULL BRDG PWM 32VFQFPN
• Manufacturer: STMicroelectronics
• Type: H Bridger

Specifications of L6227Q

• Input Type: Non-Inverting
• Number Of Outputs: 4
• On-state Resistance: 730 mOhm
• Current - Output / Channel: 1.4A
• Current - Peak Output: 2.8A
• Voltage - Supply: 8 V ~ 52 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, 32-VFQFPN
• Product: H-Bridge Drivers
• Rise Time: 250 ns
• Fall Time: 250 ns
• Supply Voltage (min): 8 V
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Bridge Type: Full Bridge
• Maximum Turn-on Delay Time: 1900 ns
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 2
• For Use With: 497-6817 - EVAL BOARD FOR L6227Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Circuit description
4
4.1
10/27
Circuit description
Power stages and charge pump
The L6227Q 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
VCP
D1
C
P
D2
VBOO T
C
BOO T
220 nF
10 nF
1N4148
1N4148
VS
A
VS
B
D01IN1328
V
Value
S
L6227Q