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LM5177DCPR Datasheet(PDF) 32 Page - Texas Instruments |
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LM5177DCPR Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 60 page  Table 7-1. CFG Pin Configuration Overview # R(CFG) / kΩ DRSS SCP – Hiccup Mode PSM Entry Threshold Current Limit 1 0 DISABLED DISABLED 10% DISABLED 2 0.511 ENABLED DISABLED 3 1.15 DISABLED ENABLED 4 1.9 ENABLED ENABLED 5 2.7 DISABLED DISABLED 10% ENABLED 6 3.8 ENABLED DISABLED 7 5.1 DISABLED ENABLED 8 6.5 ENABLED ENABLED 9 8.3 DISABLED DISABLED 15% DISABLED 10 10.5 ENABLED DISABLED 11 13.3 DISABLED ENABLED 12 16.2 ENABLED ENABLED 13 20.5 DISABLED DISABLED 15% ENABLED 14 24.9 ENABLED DISABLED 15 30.1 DISABLED ENABLED 16 36.5 ENABLED ENABLED 7.3.17 Dual Random Spread Spectrum – DRSS The device provides a digital spread spectrum, which reduces the EMI of the power supply over a wide frequency range. This function is enabled by the CFG pin. When the spread spectrum is enabled, the internal modulator dithers the internal clock. When an external synchronization clock is applied to the SYNC pin, the internal spread spectrum is disabled. DRSS combines a low frequency triangular modulation profile with a high frequency cycle-by-cycle random modulation profile. The low frequency triangular modulation improves performance in lower radio frequency bands (for example, AM band), while the high frequency random modulation improves performance in higher radio frequency bands (for example, FM band). In addition, the frequency of the triangular modulation is further modulated randomly to reduce the likelihood of any audible tones. To minimize output voltage ripple caused by spread spectrum, duty cycle is modified on a cycle-by-cycle basis to maintain a nearly constant duty cycle when dithering is enabled. f(SW) x 1.078 f(SW) Inte rnal Low Freq uency Rand om Modul atio n High Fr equen cy Rando m Modulation f(SW) x 0.922 DRS S Disable d DRS S Enable d Low + Hi gh Fre quency Rando m Modulation (DRSS) Figure 7-18. Dual Random Spread Spectrum LM5177 SNVSBU4F – JUNE 2022 – REVISED JANUARY 2025 www.ti.com 32 Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated Product Folder Links: LM5177 |
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