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L6935 Scheda tecnica(PDF) 11 Page - STMicroelectronics

Il numero della parte L6935
Spiegazioni elettronici  High performance 3 A ULDO linear regulator
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6935 Scheda tecnica(HTML) 11 Page - STMicroelectronics

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Device description
L6935
11/20
5
Device description
5.1
Soft-start
L6935 implements a soft-start feature to smoothly charge the output filter avoiding high in-
rush currents to be required to the input power supply.
The soft-start process begins as soon as VBIAS reaches UVLO and ENABLE is asserted.
A constant current ISS = 1.0 µA is sourced through the SS pin: connecting an external
capacitor (CSS) to this pin a voltage ramp is implemented; the voltage ramp internally
clamps the E.A. reference, resulting in a controlled slope for the output voltage. As the
voltage on CSS reaches the VREF value the internal clamp is released.
In this way, the soft-start process lasts for:
where CSS is the external capacitor [F] and TSS is the soft-start time [sec.].
If the device is disabled (ENABLE low) and the VBIAS is still present, the SS pin is clamped
to GND for a fixed time of about 50
µs. in order to discharge the residual charge present on
CSS: in this way, the device will be ready for a new SS process as ENABLE is asserted
again.
Figure 9 describes a typical soft-start process.
Figure 9.
Soft start process diagram (left) and measured (right)
T
SS
C
SS
V
REF
I
SS
--------------
510
5
C
SS F
[]
⋅⋅
==
ENABLE
Vbias
ADJ
Vout
0.5V
>0.7V
>1.1V
Programmed Vout
~50
µsec
Programmed Tss


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