ATA6830-PKHW Atmel, ATA6830-PKHW Datasheet - Page 14

• Manufacturer Part Number: ATA6830-PKHW
• Description: Motor / Motion / Ignition Controllers & Drivers IC Automotive for Headlamp Adjustment
• Manufacturer: Atmel
• Type: 2 Phase Stepper Motor Driverr

Specifications of ATA6830-PKHW

• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 7 V to 20 V
• Supply Current: 7 mA
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.10
14
Bridge Current Control
ATA6830
The bridge current is controlled by a chopper current control, shown in
is turned on every 40 µs (25 kHz chopper frequency). The current flow in the H-bridge is shown
in
sured via the shunt voltage. As soon as the current has reached its nominal value it is turned off
again. The current flow in this state is shown in
Figure 3-11. Chopper Current Control
Figure 3-12. Current Flow in Halfbridge
Figure
OFF
3-12a. After a blanking time of 2.5 µs to suppress turn-on peaks the current is mea-
ON
turn on signal
shunt resistor
comparator
coil current
voltage
flyback
I
max
blanking time
a)
OFF
ON
Figure
3-12b.
OFF
ON
Figure
3-11. The current
b)
4575D–BCD–09/05
ON
OFF