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SI-8504L 数据表(PDF) 4 Page - Sanken electric |
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SI-8504L 数据表(HTML) 4 Page - Sanken electric |
4 / 6 page 99 sTa-PD Characteristics sSI-8500L application circuit Terminal no.2 is for soft start. Connecting a capacitor to the terminal enables the soft start function. See page 85 for the formulas to calcu- late delay time and rise time. Output can be turned on and off by using the soft start terminal. To stop output, set the soft start terminal voltage to VSSL (0.2V typ.) or less. To switch the potential of the soft start terminal, drive the open collector of the transistor. Since the discharge current from C3 flows to the ON/OFF control transistor, limit the current for protection. The SS terminal is pulled up to the power supply in the IC and no external voltage can be applied. sCaution 1. Allocation of Components For the best operating environment, the ground should be a single ground line at the GND terminal (terminal 2 on the SI-8400L, terminal 3 on the SI-8500L), and the wiring from C1 and C2 to ground should be as short as possible. 2. Capacitors C1 and C2 1) They must satisfy the breakdown voltage and allowable ripple current. Exceeding the ratings of these capacitors or using them without derating shortens their service lives and may also cause abnormal oscillation of the IC. 2) C2 must be a low-impedance type capacitor to ensure minimum ripple voltage and stable switching operation. 3) C3 (SI-8500L only) is a capacitor for soft start. When not using soft start, leave terminal 2 open. It is pulled up inside the IC. 3. Terminals LIN and NC in the connection diagram must be left unconnected to other circuits. 4. The IC's metalic heatsink is electrically floating. Do not connect it to GND or any other circuit. 5. Since the SI-8400L and 8500L series have an open-package construction, they can only be operated in specific environments. Verify the operating environment and use the conditions indicated in the reliability data. 1.5 1.0 0.5 0 025 50 Ambient Temperature Ta ( °C) 75 100 SI-8400L 3.0 2.0 1.0 0 0 25 50 75 100 SI-8500L Ambient Temperature Ta ( °C) SI-8500L SI-8500L S.S. 2 S.S. 2 S.S. C3 C3 2 VO. ON/OFF Soft start Soft start +VO ON/OFF SI-8500L qSI-8400L/8500L Series VO :Output voltage IO :Output current ηχ :Efficiency (%) The efficiency depends on the input voltage and the output current.Thus, obtain the value from the efficiency graph and substitute the percentage in the formula above. PD=VO•IO 100 –1 ηχ |
类似零件编号 - SI-8504L |
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类似说明 - SI-8504L |
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