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L6227Q 数据表(PDF) 10 Page - STMicroelectronics

部件名 L6227Q
功能描述  DMOS dual full bridge driver with PWM current controller
Download  27 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6227Q 数据表(HTML) 10 Page - STMicroelectronics

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Circuit description
L6227Q
10/27
4
Circuit description
4.1
Power stages and charge pump
The L6227Q integrates two independent power MOS Full Bridges. Each power MOS has an
RDS(on) = 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Cross
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
Figure 5. The oscillator output (VCP) is a square wave at 600 kHz (typical) with
10 V amplitude. Recommended values/part numbers for the charge pump circuit are shown
in
Table 6.
Figure 5.
Charge pump circuit
Table 6.
Charge pump external components values
Component
Value
CBOOT
220 nF
CP
10 nF
D1
1N4148
D2
1N4148
D2
CBOOT
D1
CP
VS
VSA
VCP
VBOOT
VSB
D01IN1328


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