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TOP254PN Datasheet(PDF) 18 Page - Power Integrations, Inc. |
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TOP254PN Datasheet(HTML) 18 Page - Power Integrations, Inc. |
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18 / 48 page 
Rev. F 01/09 18 TOP252-262 www.powerint.com Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins (cont.) PI-4727-061207 DC Input Voltage + - D S C CONTROL M D SS S DS C S C M PI-4728-120307 DC Input 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 29. Three Terminal Operation (MULTI-FUNCTION Features Disabled). Figure 30. Line Sensing for Undervoltage, Overvoltage and Line Feed-Forward. Figure 28. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and Latched Output Overvoltage Protection with Device Reset. PI-4756-121007 DC Input Voltage Sense Output Voltage + - DV S C V UV = IUV × RLS +VV (IV = IUV) V OV =IOV ×RLS +VV (IV = 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 10 k Reset Q R Typical Uses of MULTI-FUNCTION (M) Pin X ON/OFF 16 k PI-4725-011008 DC Input Voltage + - D S C CONTROL V R IL R LS Q R 4 M V UV = IUV × RLS +VV (IV = IUV) V OV =IOV ×RLS +VV (IV = IoV) DC MAX@100 VDC = 76% DC MAX@375 VDC = 41% 12 k For R IL = I LIMIT = 61% Q R can be an optocoupler output or can be replaced by a manual switch. TOP259-261YN would use the G pin as the return for Q R. X DC Input Voltage + - D S C CONTROL V R IL R LS 12 k 4 M V UV = IUV x RLS +VV (IV = IUV) V OV =IOV xRLS +VV (IV = IoV) For R LS =4M DC MAX @ 100 VDC = 76% DC MAX @ 375 VDC = 41% For R IL = 12 k I LIMIT = 61% See Figure 55b for other resistor values (R IL) to select different I LIMIT values. V UV = 102.8 VDC V OV = 451 VDC TOP259-261YN would use the G pin as the return for R IL. Figure 26. Active-on Remote ON/OFF with Line-Sense and External Current Limit. Figure 27. Line Sensing and Externally Set Current Limit. |
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