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L6985F Datasheet(PDF) 23 Page - STMicroelectronics

Part # L6985F
Description  Internal current limiting
PDF  65 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6985F Datasheet(HTML) 23 Page - STMicroelectronics

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L6985F
Functional description
65
4.5
Light-load operation
The MLF pinstrapping during the power-up phase determines the light-load operation (refer
to Table 7 on page 11).
4.5.1
Low noise mode (LNM)
The low noise mode implements a forced PWM operation over the different loading
conditions. The LNM features a constant switching frequency to minimize the noise in the
final application and a constant voltage ripple at fixed VIN. The regulator in steady loading
condition never skip pulses and it operates in the continuous conduction mode (CCM) over
the different loading conditions thus making this operation mode ideal for noise sensitive
applications.
Figure 13. Low noise mode operation



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