Collector-emitter saturation voltage. VCE (sat). IC = 1 A, IB = A. ―. ―. V. Base-emitter saturation voltage. VBE (sat). IC = 1 A, IB = A. ―. ―. V. 2SCY datasheet, 2SCY circuit, 2SCY data sheet: TOSHIBA – Power Amplifier Applications Power Switching Applications,alldatasheet. Absolute Maximum Ratings. Unless otherwise specified, TA = 25 °C. Parameter. Symbol. Conditions. Rating. Unit. Collector to Base Voltage.
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The IDP is specially designed for switch mode power supplies used in TV power system applications. The auxiliary power supply can be eliminated by the integrated high-voltage start-up cell and advanced burst mode control.
With an active X-CAP discharge function, low stand-by power consumption during burst mode is supported. A comprehensive set of built-in protection features can greatly enhance the system operation and safety. Up to 40 different parameters ensure flexibility during system design and achieve optimal performance. Application Note 3 Revision 1. Typical operating characteristics such as performance curves and oscilloscope waveforms are shown at the end of the document.
The sense voltage is fed into the CS0 pin and compared to the internal voltage level for current limiting. Multi-mode operation is implemented by the IDP Based on constant on time control, it does not require a direct sine wave reference signal.
However, with CrCM operation, the PFC switching frequency may increase to a quite a high value at light load, which leads to high switching losses.
In this way, the switching frequency is limited between a minimum and maximum value. Thus, it can effectively monitor and protect the PFC bus voltage against any overshoot in the case of the abrupt load or input voltage variations. The IDP features VS pin open loop protection, which can effectively protect the whole system in the case of the VS pin external high side resistor becoming open circuit.
Brown-in and brown-out protections are provided with the integrated startup cell via the HV pin to avoid the system working at extremely low AC input. In order to meet the increasingly stringent system safety requirements, the IDP also features VS pin open circuit protection and VS pin short to adjacent pin protection.
In addition, the IDP features long term continuous conduction mode protection, which can help to protect the whole system in the case of a shorted PFC bypass diode or heavy load condition. The switching frequency can be changed by the IDP to regulate the output voltage against the load and input voltage variations.
Application Note 7 Revision 1. Hence, high power conversion efficiency is achieved. Hence, the system BOM cost and design effort is greatly reduced. The mains transformer T1 uses a magnetic integration approach, incorporating the resonant series and shunt inductances.
2SC2655Y . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características
Thus, no additional datasheer coils are required for resonance. The transformer configuration for the secondary winding is center-tapped, and the output rectifiers, D3 and D9, are schottky type diodes, in order to reduce the power dissipation. Thus, the current flowing through the primary winding is strictly controlled to ensure the system max power 2sc2655u and over current protection.
Since the IDP has an internal voltage reference and pull-up resistor for the HBFB pin, the feedback signal from the opto-coupler U2 can be directly fed into this pin, which also minimizes the BOM cost and design effort. As a result, the LLC will stop switching after a blanking time and enter the auto-restart mode, with a configurable break time to protect the whole power supply system. Thus, at extremely light load conditions, with this burst mode feature, the LLC output will still 2sf2655y under regulation.
To achieve good cross regulation, a weighted voltage control is adopted.
On the other hand, during standby operation switch SW1 pin 1 disconnects from pin 3Q5 is off, and R32 is disconnected, which 2sc255y reduce the output voltage to lower standby power consumption.
Output voltage regulation is controlled through the shunt regulator TL U3 and the optocoupler U2 provides electrical isolation between the primary and secondary sides. Resistor R29 provides the bias current required by U3 and is placed in parallel with U2 to ensure that the bias current to the TL does not become a part of the feedback current.
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Resistor R21 sets the overall DC loop gain and limits the current through U2 during transient conditions. R22, C10 and C11 set the frequency response for the feedback circuit. Application Note 8 Revision 1. T18 x x10 x 6, holder: The full load efficiency at V AC reaches The output common was connected to the primary side PE. Application Datashet 20 Revision 1. To further improve conducted EMI performance at high frequency, two ferrite beads are added to the output rectifier diodes, which are not shown in the BOM.
The system has a metal chasis during the measurement. The measurements were taken after two hours running at full load. Table 6 Hottest temperature of demo board No. Moreover, with multi-mode operation, the PFC switching frequency is limited to the design range, which breaks down the switching loss under high line and light datashest.
Hence, unity power factor has been achieved. Daatasheet Figure 22, even in the case of an extremely dynamic load change between minimum and datasheeet load, the PFC bus voltage only varies within the acceptable range. When the CS0 voltage exceeds 0. In the case of an extreme load or line jump, the PFC output may suffer significant overshoot. The measured OVP1 threshold is 2.
However, the requirements on standby power consumption are becoming tighter. Thus, in order to reduce the power consumed by the voltage divider on the MFIO pin, a lossless sensing circuit with a BSS is recommended as shown in Figure Thus, the bus voltage increases immediately since the PFC is working in a closed loop and trying to regulate the VS voltage to 2.
If the fault condition is not removed, after ten continuous triggers of an ROVP event, the system dtasheet enter auto-restart mode. For more details, please refer to the IDP datasheet. In Figure 28 and Figure 29, the PFC bus voltage smoothly increases until reaching the target regulation value.
While under normal operation, svp is set to 6 to achieve more stable operation. Moreover, during the PFC start-up phase, its gate driver voltage is set to 7. Accordingly, when the VS voltage reaches 2. Its default maximum soft-start frequency is khz, and the LLC switching frequency 2ssc2655y sweeps from a high level to a low level and finally enters normal operation.
Application Note 28 Revision 1. It can be seen that the LLC switching frequency varies against the load changes, and the measured output voltage ripple at 12 V is around mv. Application Note 29 Revision 1. During the holdup time, the LLC switching frequency drops to regulate the output voltage against the bus voltage drop. The measured holdup time is around 24 ms, which meets most of the power supply specification.
Application Note 30 Revision 1. However, during the burst on period if the bus voltage is higher than its target, then the PFC will not switch. To achieve datashet standby power consumption, the default target bus voltage during burst mode is around V the VS reference is set at 2sc655y.
The default LLC switching frequency under burst mode is set to khz, which is configurable and should be based on the LLC resonant tank design. For a detailed description of burst mode operation, please refer to the IDP datasheet.
There is a 10ms blanking time before the system enters burst mode as shown in the left side waveform. In the right side waveform, the system is leaving burst mode. It can be seen that another quick softstart is implemented for the LLC when the system is leaving burst mode. Thus, the LLC output may drop slightly during the load jump from standby load to full load. Overcurrent protection triggered by these two thresholds has different reactions in the HB LLC converter.
Once the voltage is higher than the threshold, the LLC frequency will be increased to khz immediately, which is configurable and should be based on the LLC resonant tank design, followed by a softstart. The second level over current protection is designed to prevent an extremely large current flowing through the shunt resistor.
In Figure 36, during normal operation, the first level OCP is triggered when the 24 V output is shorted to ground. Accordingly, the LLC switching frequency jumps to khz to limit the primary current. After eight continuous OCP1 triggers, the system enters auto-restart mode with two seconds break time. Once the overcurrent condition is removed, the system will recover with a soft-start. Application Note 32 Revision 1. The AC input voltage is measured via the HV pin during burst mode, and once the AC is unplugged, the IC detects the event, and after a blanking time, it turns on the start-up cell to discharge the X-Capacitor.
For details, please refer to the IDP datasheet. In Figure 37, the X-Capacitor discharge feature during burst mode with typical standby loading is demonstrated, where it takes less than 1 s to detect and discharge the X-Capacitor after the AC is unplugged. With selected applications, the table of its configurable parameters can be loaded as shown in the right side of the figure.
In order to provide a clear understanding, the parameters are explained with images, waveforms and descriptions. Detailed information about the configurable parameters is shown in the datasheet, and a detailed description of the configuration tool is shown in the dpvision user manual. Configuration tool dpvision setup Figure 38 Parameter configuration tool dpvision dpvision parameter configuration page Application Note 34 Revision 1.
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Application Note Version 1.