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TOP250YN- Datasheet(PDF) 12 Page - Power Integrations, Inc. |
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TOP250YN- Datasheet(HTML) 12 Page - Power Integrations, Inc. |
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12 / 52 page  TOP242-250 M 12/04 12 be used as a remote ON/OFF and a synchronization input in both modes. Please refer to Table 3 for possible combinations of the functions with example circuits shown in Figure 30 through Figure 40. A description of specific functions in terms of the MULTI-FUNCTION pin I/V characteristic is shown in Figure 11. The horizontal axis represents MULTI-FUNCTION pincurrentwithpositivepolarityindicatingcurrentsflowinginto the pin. The meaning of the vertical axes varies with functions. For those that control the ON/OFF states of the output such as UV, OV and remote ON/OFF, the vertical axis represents the enable/disable states of the output. UV triggers at I UV (+50 µA typical) and OV triggers at I OV (+225 µA typical with 30 µA hysteresis). Between the UV and OV thresholds, the output is enabled. For external current limit and line feed- forward with DC MAX reduction, the vertical axis represents the magnitude of the I LIMIT and DCMAX. Line feed-forward with DC MAX reduction lowers maximum duty cycle from 78% at IM(DC) (+60 µA typical) to 38% at I OV (+225 µA). External current limit is available only with negative MULTI-FUNCTION pin current. Please see graphs in the Typical Performance Characteristics section for the current limit programming range and the selection of appropriate resistor value. -250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 PI-2636-010802 Output MOSFET Switching (Enabled) (Disabled) ILIMIT (Default) DCMAX (78.5%) Current Limit M Pin L Pin X Pin Maximum Duty Cycle VBG -22 µA -27 µA VBG + VTP I I I I IUV IREM(N) IOV 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. X and L Pins (Y, R or F Package) and M Pin (P or G Package) Current ( µA) Disabled when supply output goes out of regulation Figure 11. MULTI-FUNCTION (P or G package), LINSE-SENSE, and EXTERNAL CURRENT LIMIT (Y, R or F package) Pin Characteristics. |
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