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L7983 Fiches technique(PDF) 15 Page - STMicroelectronics

No de pièce L7983
Description  60 V, 300 mA synchronous step-down switching regulator with 10 μA quiescent current
PDF  43 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7983 Fiches technique(HTML) 15 Page - STMicroelectronics

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5.3
Switching frequency programming and dithering
The L7983 has one programming pin, FSW (pin 4), which is used to set the regulator free running switching
frequency.
The switching frequency programming feature is performed by selecting the proper 1% accuracy resistor, to be
mounted between pin 4 and ground or VCC, as summarized in the following table. The pinstrapping is active only
before the soft-start phase to minimize the IC consumption.
Refer also to Figure 1 for reference schematic.
Table 7. FSW pin programming resistor
Dithering enabled
Dithering disabled
#
RVCC [kΩ]
RGND [kΩ]
Fsw [kHz] (1)
#
RVCC [kΩ]
RGND [kΩ]
Fsw [kHz] (1)
1
0
--
1000
1
--
0
1000
2
1,8
--
200
2
--
1,8
200
3
3,3
--
400
3
--
3,3
400
4
5,6
--
500
4
--
5,6
500
5
10
--
700
5
--
10
700
6
18
--
1500
6
--
18
1500
7
33
--
2000
7
--
33
2000
8
56
--
2200
8
--
56
2200
1. Typical value. Refer to Table 6 for details.
L7983
Switching frequency programming and dithering
DS13354 - Rev 1
page 15/43



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