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TOP248R Datasheet(PDF) 4 Page - Power Integrations, Inc. |
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TOP248R Datasheet(HTML) 4 Page - Power Integrations, Inc. |
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4 / 52 page  TOP242-250 4 G 1/02 Pin Functional Description DRAIN (D) Pin: High voltage power MOSFET drain output. The internal start-up bias current is drawn from this pin through a switched high-voltage current source. Internal current limit sense point for drain current. CONTROL (C) Pin: Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide inter- nal bias current during normal operation. It is also used as the connection point for the supply bypass and auto-restart/ compensation capacitor. LINE-SENSE (L) Pin: (Y, R or F package only) Input pin for OV, UV, line feed forward with DC MAX reduction, remote ON/OFF and synchronization. A connection to SOURCE pin disables all functions on this pin. EXTERNAL CURRENT LIMIT (X) Pin: (Y, R or F package only) Input pin for external current limit adjustment, remote ON/OFF, and synchronization. A connection to SOURCE pin disables all functions on this pin. MULTI-FUNCTION (M) Pin: (P or G package only) This pin combines the functions of the LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) pins of the Y package into one pin. Input pin for OV, UV, line feed forward with DC MAX reduction, external current limit adjustment, remote ON/OFF and synchronization. A connection to SOURCE pin disables all functions on this pin and makes TOPSwitch-GX operate in simple three terminal mode (like TOPSwitch-II). Figure 3. Pin Configuration (top view). PI-2509-040501 DC Input Voltage + - DM S C VUV = IUV x RLS VOV = IOV x RLS For RLS = 2 MΩ VUV = 100 VDC VOV = 450 VDC DCMAX@100 VDC = 78% DCMAX@375 VDC = 38% CONTROL RLS 2 M Ω PI-2517-040501 DC Input Voltage + - DM S C For RIL = 12 kΩ ILIMIT = 69% CONTROL RIL See fig. 55 for other resistor values (RIL) For RIL = 25 kΩ ILIMIT = 43% to select different ILIMIT values X PI-2629-040501 DC Input Voltage + - D S C CONTROL L R IL R LS 12 k Ω 2 M Ω VUV = IUV x RLS VOV = IOV x RLS For RLS = 2 M Ω DCMAX@100 VDC = 78% DCMAX@375 VDC = 38% For RIL = 12 kΩ ILIMIT = 69% See fig. 55 for other resistor values (RIL) to select different ILIMIT values VUV = 100 VDC VOV = 450 VDC Figure 4. Y/R/F Package Line Sense and Externally Set Current Limit. Figure 5. P/G Package Line Sense. Figure 6. P/G Package Externally Set Current Limit. FREQUENCY (F) Pin: (Y, R or F package only) Input pin for selecting switching frequency: 132 kHz if connected to SOURCE pin and 66 kHz if connected to CONTROL pin. The switching frequency is internally set for fixed 132 kHz operation in P and G packages. SOURCE (S) Pin: Output MOSFET source connection for high voltage power return. Primary side control circuit common and reference point. PI-2724-010802 Tab Internally Connected to SOURCE Pin Y Package (TO-220-7C) C D S S S S 1 C 3 X 2 L 5 F 4 S 7 D M P Package (DIP-8B) G Package (SMD-8B) R Package (TO-263-7C) F Package (TO-262-7C) 8 5 7 1 12 3 4 5 7 CL X S F D 4 2 3 |
Similar Part No. - TOP248R |
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Similar Description - TOP248R |
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