TLE 8444SL Infineon Technologies, TLE 8444SL Datasheet - Page 28

• Manufacturer Part Number: TLE 8444SL
• Manufacturer: Infineon Technologies

Specifications of TLE 8444SL

• Packages: PG-SSOP-24-7
• Ipeak: 4 x 0.8 A
• Inhibit: Y
• Iq (typ): 1.0 µA
• Mounting: SMT
• Technology: BCD

5.5.1
Current Flow In a H-Bridge for stepper motor control
To achieve a continuous movement of a bipolar stepper motor rotor, the phase current has to be reversed step by
step. The current flow through a fullbridge is displayed in
a current flow over HS1 the phase coil of the stepper motor load, the LS2 to GND. The next step reverses the
current flow through the phase coil of the motor by switching off HS1 and LS2 and activating HS2 and LS1 instead
(Picture b).
Figure 20
Data Sheet
HS1
LS1
a
OUT1
Application Note for Bipolar Stepper Motor Control
Reversing the current in fullbridge operation to achieve a stepper motor movement
R
phase
Vs
GND
L
phase
OUT2
HS2
LS2
28
Figure 20
HS1
LS1
b
below. Picture a) on the left hand side shows
OUT1
R
phase
GND
Vs
L
phase
Rev. 1.1, 2009-07-07
Block Description
TLE 8444SL
OUT2
HS2
LS2