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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RT9245PC датащи(PDF) 13 Page - Richtek Technology Corporation |
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RT9245PC датащи(HTML) 13 Page - Richtek Technology Corporation |
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13 / 22 page  RT9245 13 DS9245-06 March 2007 www.richtek.com Figure 7. Over Current Protection at steady state Current Ratio Setting Figure 8. Application circuit for current ratio setting For some case with preferable current ratio instead of current balance, the corresponding technique is provided. Due to different physical environment of each channel, it is necessary to slightly adjust current loading between channels. Figure 8 shows the application circuit of GM for current ratio requirement. Applying KVL along L+DCR branch and R1+C//R2 branch : L 2 1 C C 2 2 1 C 1 C C 2 C 1 L L I DCR R R R2 V For V R R R dt dV C R V ) dt dV C R V ( R I DCR dt dI L × + = + + = + + = × + Look for its corresponding conditions : C (R1//R2) DCR L Let I DCR dt dI DCR C (R1//R2) I DCR dt dI L L L L L × = × + × × × = × + With internal current balance function, this phase would share (R1+R2)/R2 times current than other phases. Figure 9 &10 show different settings for the power stages. Figure 11 shows the performance of current ratio compared with conventional current balance function in Figure 12. Figure 9. GM4 Setting for current ratio function Figure 10. GM1~3 Setting for current ratio function Figure 11 CH1:(5V/Div) CH2:(5V/Div) Over Current Protection Time (25ms/Div) PWM VSS Current Ratio Function 0 5 10 15 20 25 30 35 0 15 304560 7590 IOUT (A) IL3 IL4 IL2 IL1 Thus if C (R1//R2) DCR L × = Then L C I DCR R2 R1 R2 V × × + = |
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