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参数资料
| 型号： | TEA3718SP |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.5 A, PZFM15 |
| 封装： | MULTIWATT-15 |
| 文件页数： | 21/21页 |
| 文件大小： | 3436K |
| 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 - RC) is fed to
the comparator input pin (Fig. A)
Depending of the RCC value the behaviour of
the circuit is different on alarm condition:
1) RC > 80
the output stage is switched off
2) RC > 60
the current in the motor windings
is reduced according to the approximate formula:
(see also fig. E and F)
with VTH = Threshold of the comparator (VCH,
VCM, VCL) 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
temperature reaches T2 (T2 > T1)
Im
=
VTH
RS
VCC
R
+ RC
RC
RS
Figure C: Alarm Detection for Powerdip Package
Figure D: CommonDetection for Several Multiwatt Package
TEA3718-TEA3718S
9/16
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