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L7986 Folha de dados(PDF) 11 Page - STMicroelectronics

Nome de Peças L7986
Descrição Electrónicos  3 A step-down switching regulator
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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L7986 Folha de dados(HTML) 11 Page - STMicroelectronics

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L7986
Functional description
43
5.2
Soft-start
The soft-start is essential to assure correct and safe startup of the step-down converter. It
avoids inrush current surge and makes the output voltage increase monothonically.
The soft-start is performed by a staircase ramp on the non inverting input (VREF) of the error
amplifier. So the output voltage slew rate is:
Equation 1
where SRVREF is the slew rate of the non inverting input, while R1and R2 is the resistor
divider to regulate the output voltage (see Figure 7). The soft-start staircase consists of 64
steps of 9.5 mV each, from 0 V to 0.6 V. The time base of one step is of 32 clock cycles. So
the soft-start time and then the output voltage slew rate depend on the switching frequency.
Figure 7. Soft-start scheme
Soft-start time results:
Equation 2
For example, with a switching frequency of 250 kHz, the SSTIME is 8 ms.
SROUT
SRVREF 1
R1
R2
--------
+


=
SSTIME
32 64
Fsw
-----------------
=


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