Transcription of 降圧コンバータIC のスナバ回路 : パワーマネジメント
1 IC . IC 1 .. RC .. RC . Figure 1 . Figure 2 LP CP .. MHz EMI . Figure 3 . RC . Figure 1.. Figure 4 RC .. Figure 5 .. CSNB . VIN VIN . 1 2 . RSNB . 1 2 . GND . CSNB . RSNB . 1 2 .. Figure 2.. CR.. - Rev. 001. 2016 ROHM Co., Ltd. All rights reserved. 1/5. AEK59-D1-0287-0. IC Application Note 10ns/div . 500ns/div Figure 3.. RC Snubber Circuit SWH. L. VIN CIN. RSNB. SWL CO RL. CSNB. Figure 4. RC . VIN VIN. SWH SWH. L L. CIN VO CIN VO. R SNB R SNB. SWL CO SWL CO. CSNB CSNB. GND GND GND GND. Figure 5.. - Rev. 001. 2016 ROHM Co., Ltd. All rights reserved. 2/5. AEK59-D1-0287-0. IC Application Note RC 8. RSNB . K. Harada, T. Ninomiya, M. Kohno, Optimum Design (8). of RC snubbers for Switching Regulators , IEEE Transactions of Aerospace and Electronics Systems, , , 2.
2 March 1979 RC . 2 RC . RC . (1) . 1.. 8 (2).. LP CP2 .. (Figure 6) . RC (Figure 7) .. 1. fr . 2. GND CP0 . 1/2 . 3. CP0 1/3 CP2 . Figure 6.. (3). 3. 4. CP2 LP . 1. (4). 2. 2V/div 5.. 10ns/div (5). 6. RSNB Z . Figure 7.. (6) 2. Figure 8 GND CP0 . 1/2 . 7. CSNB CP2 1 4 . 680pF . 1~4 (7). (Figure 9) . - Rev. 001. 2016 ROHM Co., Ltd. All rights reserved. 3/5. AEK59-D1-0287-0. IC Application Note 6. RSNB . Z . SWH. L . VIN CIN.. SWL CP 0 CO RL. 7. CSNB CP2 1 4 . 1~4 Figure 8. CP0 . 227pF 454pF 681pF 908pF . 220pF 470pF 680pF 1000pF .. Figure 10 14 680pF .. 10 .. 2V/div . 8. RSNB . 10ns/div VIN 5V fSW 1 MHz . 680pF 5 1 MHz 17 mW. Figure 9. CPO 680pF . 17mW .. 3.. 4 2.
3 CP2 CP0 1/3 CP0 . 680pF CP2 VIN 24V fSW . 1 MHz . 680. 227 pF. 3 3 680pF 24 1 MHz 1W 6432. 4. CP2 .. (2512 inch) . LP fr CP2 227pF 680pF .. 1 1.. 2 2 227.. 5.. 227. - Rev. 001. 2016 ROHM Co., Ltd. All rights reserved. 4/5. AEK59-D1-0287-0. IC Application Note 2V/div 2V/div 10ns/div 10ns/div Figure 10. Figure 14. RSNB= CSNB=1000pF. 2V/div 10ns/div Figure 11. RSNB= CSNB=220pF. 2V/div 10ns/div Figure 12. RSNB= CSNB=470pF. 2V/div 10ns/div Figure 13. RSNB= CSNB=680pF. - Rev. 001. 2016 ROHM Co., Ltd. All rights reserved. 5/5. AEK59-D1-0287-0. Notice . 1) . 2) .. 3) .. 4) .. 5) .. 6) AV OA .. 7) . 8) .. 9) .. 10) . 11) .. 12) RoHS .. RoHS . 13) .. 14) .. ROHM Customer Support System 2016 ROHM Co.
4 , Ltd. All rights reserved. R1102A.
