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BD9P1X5EFV-C Datasheet(PDF) 23 Page - Rohm |
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BD9P1X5EFV-C Datasheet(HTML) 23 Page - Rohm |
23 / 60 page 23/57 TSZ02201-0J1J0AL01480-1-2 © 2019 ROHM Co., Ltd. All rights reserved. 08.Apr.2020 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5EFV-C Series Function Explanation - continued 7. Spread Spectrum Function Connecting the SSCG pin with the VREG pin activates the Spread Spectrum function, reducing the EMI noise level. When the Spread Spectrum function is activated, the swi tching frequency is varied with triangular wave of ΔfSSCG (±4.5 %, Typ) amplitude centered on typical frequency fSW (2.2 MHz, Typ). The period of the triangular wave is tSSCG_CYCLE (466 µs, Typ). However, this function is masked when the RESET output is low. Connecting the SSCG pin with GND deactivates this function. Figure 37. Spread Spectrum Function VIN VEN VOUT fSW VRESET VSSCG tDLY fSW 2.2 MHz (Typ) tRSTNACT Δ f SSCG = -4.5 % (Typ) SSCG OFF SSCG ON VRTH 3.6 ms (Typ) 400 µs (Typ) tSSCG_CYCLE 466 µs (Typ) Δ f SSCG = +4.5 % (Typ) |
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