參數(shù)資料
型號(hào)： TLE7209R
廠商： INFINEON TECHNOLOGIES AG
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, PDSO20
封裝： PLASTIC, SOP-20
文件頁(yè)數(shù)： 28/31頁(yè)
文件大?。?/td> 484K
代理商： TLE7209R
TLE 7209R
Circuit Description
Final Datasheet
6
V2.5, 2004-may-25
2.2
Power Stages
Four n-channel power-DMOS transistors build up the output H-bridge. Integrated circuits
protect the outputs against over-current and over-temperature if there is a short-circuit
to ground, to the supply voltage or across the load. Positive and negative voltage spikes,
which occur when switching inductive loads, are limited by integrated freewheeling
diodes. To drive the gates of the high-side DMOS, an internal charge pump is integrated
to generate a voltage higher than the supply voltage.
2.2.1
Chopper Current Limitation
To limit the output current at low power loss, a chopper current limitation is integrated as
shown in Figure 3. The current is measured by sense cells integrated in the low-side
switches. When the current limit
IL has been exceeded for a time tb, all output stages are
switched off for a fixed time
ta.
Figure 3
Chopper current limitation
I OUT
Current limit I
L
Switch-off time t
a
time
Blanking time t
b
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