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AP3983R Datasheet(PDF) 10 Page - Diodes Incorporated |
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AP3983R Datasheet(HTML) 10 Page - Diodes Incorporated |
10 / 15 page AP3983R Document number: DS38247 Rev. 3 - 2 10 of 15 www.diodes.com June 2016 © Diodes Incorporated AP3983R Operation Principle Description (Cont.) VCS_L VCS_H Light-load High-load VCS_REF fSW 0.5kHz 80kHz 37% 5% 24kHz IO(MAX) 65kHz full load Figure 4 Multiple Segment Peak Current at CV Mode It can be seen from Figure 4, with multiple segment peak current control, the AP3983R power system can keep switching frequency above 24kHz at whole heavy load and most of light load to guarantee the audible noise-free performance. Constant Voltage Operation in LL Mode and Dynamic Response In primary side regulation of the AP3983R application, APR3415 must be used at secondary side as the output voltage regulator, low standby power and excellent dynamic response can be achieved. When the output voltage detected by APR3415 is lower than its trigger voltage, APR3415 outputs periodical signals which will be coupled to auxiliary side. When the AP3983R detects the signal which is valid that the signal voltage is higher than VTRIGGER and tOFF is longer than tDELAY, the AP3983R will begin an operating pulse, then primary switch immediately turns on to provide one energy pulse to output terminal and primary VCC. By fast response and cooperation, the APR3415 and AP3983R can maintain a constant output voltage with very low operating frequency in LL mode and also can effectively improve dynamic performance for primary side regulation power systems. The conditions of entering LL mode---VCPC<20mV and tOFF>256μs. The condition of exiting LL mode---VCPC ≥40mV or tOFF<256μs. The critical point of the LL mode is generally about 5% IO(MAX). 3-Segment Drive Current for Radiative EMI Suppression When the power switch is turned on, a turn-on spike will occur, that worsens the radiative EMI. It is an effective way to decrease drive current before gate voltage gets to miller platform. The AP3983R uses 3-segment drive current for radiative EMI suppression, as shown in Figure 5. When gate voltage gets to 6V, the AP3983R drive current switches from low current (43mA) to high current (110mA). When the gate voltage gets to 10V, the drive current will decrease gradually to 0mA until the gate voltage goes up to the clamp voltage (13V). |
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