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TOP246Y Datasheet(PDF) 4 Page - Power Integrations, Inc. |
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TOP246Y Datasheet(HTML) 4 Page - Power Integrations, Inc. |
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4 / 48 page  TOP242-249 4 E 7/01 August 8, 2000 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 internal 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 or R 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 or R 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). FREQUENCY (F) Pin: (Y or R package only) Input pin for selecting switching frequency: 132 kHz if 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 M Ω 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 k Ω ILIMIT = 69% CONTROL RIL See fig. 55 for other resistor values (RIL) For RIL = 25 k Ω 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 k Ω 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 Package Line Sense and Externally Set Current Limit. Figure 5. P/G Package Line Sense. Figure 6. P/G Package Externally Set Current Limit. 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-2724-033001 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) 8 5 7 1 12 3 4 5 7 CL X S F D 4 2 3 |
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