Datasheet AP3917D (Diodes) - 8
| Hersteller | Diodes |
| Beschreibung | 700V Non-isolated regulator up to 370mA output current in SO-7 package |
| Seiten / Seite | 12 / 8 — AP3917D. Performance Characteristics. Operation Frequency and Peak … |
| Dateiformat / Größe | PDF / 593 Kb |
| Dokumentensprache | Englisch |
AP3917D. Performance Characteristics. Operation Frequency and Peak Current Characteristics. Switching Frequency vs. IOUT
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AP3917D Performance Characteristics
(continued) Figure 4 describes the driver time sequence. 62ms 31ms 15.5ms Driver Stage I Stage II Stage III 128 switching cycles 128 switching cycles 128 switching cycles Figure 4. Driver Time Sequence in Startup Process
Operation Frequency and Peak Current Characteristics
In order to achieve excellent efficiency performance at light load and improve the overall system efficiency, AP3917D utilizes an optimized frequency curve as is shown in Figure 5. By means of increasing MOSFET off time, switching frequency continuously decreases as the load decrease, which is optimized for better light-load efficiency. The peak current also decreases with the load decreases, which may avoid the audio noise when the frequency enters into audio frequency range. The switching-frequency equation is as follows: V − V V f IN O O = ( ) , for CCM s V 2 L I ( − I ) IN PK O V − V 2 V I f IN O O O = ( ) , for DCM s V 2 IN L I PK (kHz)
Switching Frequency vs. IOUT
70 60 50 40 30 20 10 0 0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 (mA) (mA)
Peak Current Limit vs. IOUT
600 500 400 300 200 100 0 0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 (mA) . Figure 5. Frequency and Peak Current Limit Characteristic (Vo = 12V, L1 = 1mH) AP3917D 8 of 12 March 2025 Document number: DS41540 Rev. 8 - 3
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(continued) Figure 4 describes the driver time sequence. 62ms 31ms 15.5ms Driver Stage I Stage II Stage III 128 switching cycles 128 switching cycles 128 switching cycles Figure 4. Driver Time Sequence in Startup Process
Operation Frequency and Peak Current Characteristics
In order to achieve excellent efficiency performance at light load and improve the overall system efficiency, AP3917D utilizes an optimized frequency curve as is shown in Figure 5. By means of increasing MOSFET off time, switching frequency continuously decreases as the load decrease, which is optimized for better light-load efficiency. The peak current also decreases with the load decreases, which may avoid the audio noise when the frequency enters into audio frequency range. The switching-frequency equation is as follows: V − V V f IN O O = ( ) , for CCM s V 2 L I ( − I ) IN PK O V − V 2 V I f IN O O O = ( ) , for DCM s V 2 IN L I PK (kHz)
Switching Frequency vs. IOUT
70 60 50 40 30 20 10 0 0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 (mA) (mA)
Peak Current Limit vs. IOUT
600 500 400 300 200 100 0 0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 (mA) . Figure 5. Frequency and Peak Current Limit Characteristic (Vo = 12V, L1 = 1mH) AP3917D 8 of 12 March 2025 Document number: DS41540 Rev. 8 - 3
www.diodes.com
© 2025 Copyright Diodes Incorporated. All Rights Reserved.