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STA801M Scheda tecnica(PDF) 5 Page - Sanken electric |
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STA801M Scheda tecnica(HTML) 5 Page - Sanken electric |
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5 / 6 page  112 sSelecting External Components 1. Inductors L1 and L2 (1) Suitable for switching regulators Do not use a coil as a noise filter because it generates excess heat. (2) Appropriate inductance A low inductance may cause abnormal oscillation, or cause the overcurrent protection circuit to malfunction in the rated current range. (3) Satisfying the rated current Exceeding the rated current may generate an extremely high current to flow due to magnetic saturation. 2. Capacitors C1, C2, and C3 (1) Satisfy the breakdown voltage and allowable ripple current Exceeding the ratings of these capacitors or using them without derating may shorten their service lives and also cause abnormal oscillation. (2) Low impedance (C2, and C3) A low-impedance model is recommended for C2 and C3 to reduce the ripple voltage and stabilize switching. For stable operation throughout the input voltage range, however, the DC equivalent series resistance (ESR) of C2 and C3 should be 0.1 ohm or less. 3. Capacitors C4 and C5 (1) C4 and C5 are soft-start capacitors. sSelecting Ch2 Output Voltage When the VO2Cont terminal voltage is set to 0.5V or less, the output voltage changes to the values shown below. To switch the potential at the VO2Cont terminal, drive the open collector of the transistor. No external voltage can be applied to the terminal. Leave the terminal open when not in use because the terminal is already pulled up in the IC. When using terminal no. 9, short it to terminal no. 10. ( ): STA802M sSoft Start ON/OFF Circuit Terminal nos. 3 and 8 are soft start terminals. Connect a capacitor to the terminal to permit a soft start. Output can be turned on and off by using the soft start terminals. Set the soft start terminal voltage to VSSL (0.15V) or less to stop the output. To switch the potential at the soft start terminals, drive the open collector of the transistor. Since the discharge currents from C4 and C5 flow 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 to the terminal. 9pin 10pin STA801M STA802M OPEN Low OPEN Low 9V 12.1V 9.1V 12.1V 11.5V 15.5V 11.7V 15.7V STA800M VO2 Cont 1 9 10 7 VO2 9V (9.1V) 12.1V (12.1V) + STA800M VO2 Cont 1 10 7 VO2 11.5V (11.7V) 15.5V (15.7V) + STA800M S.S. C4, C5 3 or 8 + STA800M Soft start Soft start +VO ON/OFF S.S. C4, C5 3 or 8 + VO2Cont terminal (1 pin) VO2 sensing terminal VO2 output voltage Low : 0.5V or less qSTA801M/802M |
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