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TOP268VG-TL Datasheet(PDF) 9 Page - Power Integrations, Inc. |
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TOP268VG-TL Datasheet(HTML) 9 Page - Power Integrations, Inc. |
9 / 36 page Rev. B 03/10 9 TOP264-271 www.powerint.com Figure 8. VOLTAGE MONITOR and EXTERNAL CURRENT LIMIT (E and V package) Pin Characteristics. -250 -200 -150 -100 -50 0 25 50 75 100 125 336 PI-5528-060409 Output MOSFET Switching (Enabled) (Disabled) (Non-Latching) (Latching) ILIMIT (Default) DCMAX (78%) Current Limit V Pin X Pin Maximum Duty Cycle VBG I I I I IUV IREM(N) IOV IOV(LS) Pin Voltage Note: This figure provides idealized functional characteristics with typical performance values. Please refer to the parametric table and typical performance characteristics sections of the data sheet for measured data. For a detailed description of each functional pin operation refer to the Functional Description section of the data sheet. X and V Pins Current ( µA) Disabled when supply output goes out of regulation section above) and runs entirely off the high voltage DC input, but with very low power consumption (<100 mW typical at 230 VAC with X pin open). When the TOP264-271 is remotely turned on after entering this mode, it will initiate a normal start-up sequence with soft-start the next time the CONTROL pin reaches 5.8 V. In the worst case, the delay from remote-on to start-up can be equal to the full discharge/charge cycle time of the CONTROL pin, which is approximately 125 ms for a 47 mF CONTROL pin capacitor. This reduced consumption remote off mode can eliminate expensive and unreliable in-line mechanical switches. It also allows for microprocessor controlled turn-on and turn-off sequences that may be required in certain applications such as inkjet and laser printers. Soft-Start The 17 ms soft-start sweeps the peak drain current and switching frequency linearly from minimum to maximum value by operating through the low frequency PWM mode and the variable frequency mode before entering the full frequency mode. In addition to start-up, soft-start is also activated at each restart attempt during auto-restart and when restarting after being in hysteretic regulation of CONTROL pin voltage (V C), due to remote OFF or thermal shutdown conditions. This effectively minimizes current and voltage stresses on the output MOSFET, the clamp circuit and the output rectifier during start-up. This feature also helps minimize output overshoot and prevents saturation of the transformer during start-up. |
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