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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 29/31頁 |
| 文件大小： | 484K |
| 代理商： | TLE7209R |
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TLE 7209R
Circuit Description
Final Datasheet
7
V2.5, 2004-may-25
2.2.2
Temperature-dependent Current Reduction
For
TILR < Tj <TSD
the
current
limit
decreases
from
IL =6.6 A ± 1.1 A to
Figure 4
Temperature dependent current reduction
2.3
Protection
The TLE 7209R is protected against short circuits, overload and invalid supply voltage
by the following measures:
2.3.1
Short circuit to Ground
The high-side switches are protected against a short of the output to ground by an over-
current shut-down. If a high-side switch is turned on and the current rises above the short
circuit detection current
IOUK all output transistors are turned off after a typical filter time
of 2
s, and the error bit “Short Circuit to Ground on output 1 (2)”, SCG1 (SCG2) is stored
in the internal status register.
2.3.2
Short circuit to VS
Due to the chopper current regulation, the low-side switches are already protected
against a short to the supply voltage. To be able to distinguish a short circuit from normal
current limit operation, the current limitation is deactivated for the blanking time
tb after
the current has exceeded the current limit threshold
IL. If the short circuit detection
current
IOUK is reached within this blanking time, a short circuit is detected (see
Figure 5). All output transistors are turned OFF and the according error bit “Short Circuit
to Battery on output 1 (2)”, SCB1 (SCB2) is set.
A
6.6A
2.5A
Tj
°C
T
SD
toleranceof temperature
dependent current
reduction
rangeof over-
temperatureshut-down
I
L
T
ILR
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