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TOP253EN Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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TOP253EN Datasheet(HTML) 6 Page - Power Integrations, Inc. |
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6 / 48 page  Rev. F 01/09 6 TOP252-262 www.powerint.com Pin Functional Description DRAIN (D) Pin: High-voltage power MOSFET DRAIN pin. 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. EXTERNAL CURRENT LIMIT (X) Pin (Y, M, E and L package): Input pin for external current limit adjustment and remote ON/OFF. A connection to SOURCE pin disables all functions on this pin. Figure 4. Pin Configuration (Top View). X DC Input Voltage + - D S C CONTROL V R IL R LS 12 k 4 M V UV = IUV × RLS +VV (IV = IUV) V OV =IOV ×RLS +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 Figure 5. TOP254-258 Y and All M/E/L Package Line Sense and Externally Set Current Limit. PI-4712-120307 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 7. P/G Package Line Sense. XG DC Input Voltage + - D S C CONTROL V R IL R LS 12 k 4 M V UV = IUV × RLS +VV (IV = IUV) V OV =IOV ×RLS +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 Figure 6. TOP259-261 Y Package Line Sense and External Current Limit. VOLTAGE MONITOR (V) Pin (Y & M package only): Input for OV, UV, line feed forward with DC MAX reduction, output overvoltage protection (OVP), remote ON/OFF and device reset. A connection to the SOURCE pin disables all functions on this pin. MULTI-FUNCTION (M) Pin (P & G packages only): This pin combines the functions of the VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) pins of the Y package into one pin. Input pin for OV, UV, line feed forward with DC MAX PI-4644-091108 Tab Internally Connected to SOURCE Pin Tab Internally Connected to SOURCE Pin Lead Bend Outward from Drawing (Refer to eSIP-7F Package Outline Drawing) Exposed Pad (Hidden) Internally Connected to SOURCE Pin Y Package (TO-220-7C) D C S S S S S S S S S 7 D 5 F 4 S 3 C 2 X 1 V 7 D 5 S 4 F 3 C 2 X 1 V 7 D 5 S 4 F 3 C 2 X 1 V 7 D 5 G 4 S 3 C 2 X 1 V M P and G Package M Package 8 5 7 1 4 2 6 D X C V 10 6 9 1 5 8 7 2 3 Note: Y package for TOP259-261 Note: Y package for TOP254-258 E Package (eSIP-7C) L Package (eSIP-7F) Y Package (TO-220-7C) |
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