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STEF4S Folha de dados(PDF) 10 Page - List of Unclassifed Manufacturers

Nome de Peças STEF4S
Descrição Electrónicos  Electronic fuse for 3.3 V and 5 V lines
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Fabricante Electrônico  ETC2 [List of Unclassifed Manufacturers]
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Typical characteristics
STEF4S
10/21
DocID025259 Rev 1
The capacitance to be added to CSS pin can be also estimated by using the following
theoretical formula:
Equation 1
The above value is not valid if CSS is not connected. CSS is expressed in Farad and the time
in seconds.
A ceramic low leakage capacitor is suggested for this purpose. The formula is meant as a
theoretical support to choose the CSS capacitor and it does not take into account the
capacitor tolerance, temperature and process variations.
Figure 4. Startup time
5.3
UVLO and voltage clamp selection
The device can be used either on the 3.3 V or on the 5 V lines. The operating mode can be
selected through the VCP pin.
If this pin is set at high level (VCP > 2 V) the operating mode is 5 V. In this mode the UVLO
threshold is 3.6 V typical, the clamping voltage is set to 5.7 V.
If the VCP pin is pulled to low level (VCP < 0.4 V), the operating mode is 3.3 V. In this mode
the UVLO threshold is 2.3 V typical, the clamping voltage is set to 3.8 V.
5.4
Enable pin
The EN pin is used to turn on/off the device. The device is disabled when the EN pin voltage
is lower than 0.4 V, enabled if the EN pin voltage is higher than 2 V.
C
SS
4.35
10 6
×
Tss
×
=


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