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L7983 データシート(PDF) 15 Page - STMicroelectronics |
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L7983 データシート(HTML) 15 Page - STMicroelectronics |
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15 / 43 page  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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