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TOP261YN 数据表(PDF) 19 Page - Power Integrations, Inc. |
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TOP261YN 数据表(HTML) 19 Page - Power Integrations, Inc. |
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19 / 49 page ![]() Rev. F 01/09 19 TOP252-262 www.powerint.com PI-4729-120307 DC Input Voltage Sense Output Voltage + - DM S C V UV = IUV × RLS +VM (IM = IUV) V OV =IOV ×RLS +VM (IM = IOV) For R LS = 4 M V UV = 102.8 VDC V OV = 451 VDC DC MAX @ 100 VDC = 76% DC MAX @ 375 VDC = 41% CONTROL R LS 4 M Figure 31. Line Sensing for Undervoltage, Overvoltage, Line Feed-Forward and Latched Output Overvoltage Protection. PI-4730-120307 DC Input Voltage Sense Output Voltage + - DM S C V UV = IUV × RLS +VM (IM = IUV) V OV =IOV ×RLS +VM (IM = IOV) For R LS = 4 M V UV = 102.8 VDC V OV = 451 VDC DC MAX @ 100 VDC = 76% DC MAX @ 375 VDC = 41% CONTROL R LS 4 M VR OVP ROVP R OVP >3k Figure 32. Line Sensing for Undervoltage, Overvoltage, Line Feed-Forward and Hysteretic Output Overvoltage Protection. PI-4731-120307 DC Input Voltage + - DM S C V UV = RLS × IUV +VM (IM = IUV) For Values Shown V UV = 103.8 VDC R LS 6.2 V 4 M 40 k CONTROL PI-4732-120307 DC Input Voltage + - DM S C V OV = IOV ×RLS +VM (IM = IOV) For Values Shown V OV = 457.2 VDC CONTROL R LS 1N4148 4 M 55 k Figure 33. Line Sensing for Undervoltage Only (Overvoltage Disabled). Figure 34. Line Sensing for Overvoltage Only (Undervoltage Disabled). Maximum Duty Cycle Reduced at Low Line and Further Reduction with Increasing Line Voltage. Typical Uses of MULTI-FUNCTION (M) Pin (cont.) Figure 35. Externally Set Current Limit (Not Normally Required – See M Pin Operation Description). PI-4733-021308 DC Input Voltage + - DM S C For R IL = 12 k I LIMIT = 61% CONTROL R IL See Figures 55b for other resistor values (R IL) to select different I LIMIT values. For R IL = 19 k I LIMIT = 37% PI-4734-092107 DC Input Voltage + - DM S C CONTROL R IL R LS 2.5 M 6 k 100% @ 100 VDC 53% @ 300 VDC I LIMIT = I LIMIT = Figure 36. Current Limit Reduction with Line Voltage (Not Normally Required – See M Pin Operation Description). |
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