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參數(shù)資料
| 型號： | TEA3718SP |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | STEPPER MOTOR DRIVER |
| 中文描述： | 步進電機驅(qū)動器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 288K |
| 代理商： | TEA3718SP |
ALARM OUTPUTS
(TEA3718SP - TEA3718DP)
The alarm output becomes low when the junc-
tion temperature reaches T
°
C.
When an alarm condition occours, parts of the
supply voltage (dividing bridge R - R
C
) is fed to
the comparator input pin (Fig. A)
Depending of the R
C
C value the behaviour of
the circuit is different on alarm condition:
1) R
C
> 80
the output stage is switched off
2) R
C
> 60
the current in the motor windings
is reduced according to the approximate formula:
(see also fig. E and F)
with V
TH
= Threshold of the comparator (V
CH
,
V
CM
, V
CL
) R = 700
(typical)
For several Multiwatt packages a common de-
tection can be obtained as in Fig. D
PRE-ALARM OUTPUT
When the junction temperature reaches T1
°
C
(typ. = 170
°
C) a prealarm signal is generated.
Soft thermal protection occours when function
temperaturereaches T2 (T2 > T1)
I
m
=
V
TH
R
S
V
CC
R
+
R
C
R
C
R
S
Figure C:
Alarm Detection for Powerdip Package
Figure D:
CommonDetectionfor Several Multiwatt Package
TEA3718-TEA3718S
9/16
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