SPH4692 Просмотр технического описания (PDF) - Siemens AG
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SPH4692 Datasheet PDF : 22 Pages
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SPH 4692
Block Diagram
Pin 1
The regulating voltage forwarded to this pin is compared with a stable internal reference voltage VR
in the regulating and overload amplifier. The output of this stage is fed to the stop comparator. If
the control voltage is rather small at pin 1 an additional current is added by means of current source
which is controlled according the level at pin 17. This additional current is virtually reducing the
control voltage present at pin 1.
Pin 2
A voltage proportional to the drain current of the switching transistor is generated there by the
external RC-combination in conjunction with the primary current transducer. The output on this
transducer is controlled by the logic and referenced to the internal stable voltage V2B . If the voltage
V2 exceeds the output voltage of the regulations amplifier, the logic is reset by the stop comparator
and consequently the output of pin 15 is switched to low potential. Further inputs for the logic stage
are the output for the start impulse generator with the stable reference potential VST and the
supply voltage motor.
Pin 3
The down divide primary voltage applied there stabilized the overload point. In addition the logic is
disabled in the event of low voltage by comparison with the internal stable voltage VV in the primary
voltage monitor block.
Pin 4
Ground
Pin 15
In the output stage the output signals produced by the logic are shifted to a level suitable for MOS-
power transistors.
Pin 16
From the supply voltage V16 are derived a stable internal references VREF and the switching
threshold V16 A , V16 E , V16 max and V16 min for the supply voltage monitor. All references values
(VR , V2 B , VST) are derived from VREF . If V16 > VVE , the VREF is switched on and switched off
when V16 < V16 A. In addition, the logic is released only for V16 min < V16 < V16 max .
Pin17
The output of the overload amplifier is connected to pin 17. A load on this output causes a reduction
in maximal impulse duration. This function can be used to implement a soft start, when pin 17 is
connected to ground by a capacitor.
Semiconductor Group
6
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