參數(shù)資料
型號(hào): TEA3718SFP
廠商: 意法半導(dǎo)體
元件分類(lèi): 基準(zhǔn)電壓源/電流源
英文描述: STEPPER MOTOR DRIVER
中文描述: 步進(jìn)電機(jī)驅(qū)動(dòng)器
文件頁(yè)數(shù): 9/16頁(yè)
文件大?。?/td> 288K
代理商: TEA3718SFP
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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