L6208QTR STMicroelectronics, L6208QTR Datasheet - Page 10

• Manufacturer Part Number: L6208QTR
• Description: Motor / Motion / Ignition Controllers & Drivers DMOS Dual Full Bridge Driver 5.6A
• Manufacturer: STMicroelectronics

Specifications of L6208QTR

• Product Category: Motor / Motion / Ignition Controllers & Drivers
• Rohs: yes

Circuit description
4
4.1
10/33
Circuit description
Power stages and charge pump
The L6208Q integrates two independent power MOSFET full bridges, each power MOSFET
has an R
conduction protection is implemented by using a dead time (t
internal timing circuit between the turn-off and turn-on of two power MOSFETs in one leg of
a bridge.
Pins VS
Using an N-channel power MOSFET 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 a few external components to realize a charge pump
circuit, as shown in
(typically) with 10 V amplitude. Recommended values/part numbers for the charge pump
circuit are shown in
Table 5.
Figure 8.
A
DS(ON)
and VS
Charge pump external component values
Charge pump circuit
Component
= 0.3 Ω (typical value @ 25 °C) with intrinsic fast freewheeling diode. Cross
C
B
BOOT
C
R
D1
D2
must be connected together to the supply voltage (V
P
P
Figure
Table
5.
8. The oscillator output (pin VCP) is a square wave at 600 kHz
Doc ID 018710 Rev 2
VCP
D1
R
C
P
P
D2
VBOOT
C
BOOT
VS
A
VS
B
V
S
DT
1N4148
1N4148
220 nF
100
Value
10 nF
= 1 µs typical value) set by
Ω
S
).
BOOT
) is obtained
L6208Q
AM02559v1