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L7983 Datasheet(PDF) 16 Page - STMicroelectronics

No. de pieza L7983
Descripción Electrónicos  60 V, 300 mA synchronous step-down switching regulator with 10 μA quiescent current
PDF  43 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7983 Datasheet(HTML) 16 Page - STMicroelectronics

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The dithering function, enabled by connecting the proper RFSW resistor to VCC, is intended to reduce the DC-DC
electromagnetic emissions, with small impact on output voltage ripple.
Figure 12. RVCC = 0 Ω, dithering enabled, no load
Figure 13. RVCC = 0 Ω, dithering enabled, no load. Detail
The internal dithering circuitry changes the switching frequency in the range of ± 5% of the nominal value. The
device updates the frequency every clock period by fixed steps:
•
Ramps up in 63 steps from minimum to maximum switching frequency
•
Ramps down in 63 steps from maximum to minimum switching frequency
The resulting frequency modulation is almost triangular, with a frequency of:
FDitℎ=FSW126
(3)
L7983
Switching frequency programming and dithering
DS13354 - Rev 1
page 16/43



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