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DPA424 Datasheet(PDF) 3 Page - Power Integrations, Inc. |
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DPA424 Datasheet(HTML) 3 Page - Power Integrations, Inc. |
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3 / 36 page  Rev. S 12/07 3 DPA422-426 www.powerint.com Figure 2. Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: High voltage power MOSFET drain output. The internal startup 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: Input pin for overvoltage (OV), under-voltage (UV) lock out, line feed-forward with the maximum duty cycle (DC MAX) reduction, remote ON/OFF and synchronization. A connection to SOURCE pin disables all functions on this pin. EXTERNAL CURRENT LIMIT (X) Pin: Input pin for external current limit adjustment and remote ON/OFF. A connection to SOURCE pin disables all functions on this pin. FREQUENCY (F) Pin: Input pin for selecting switching frequency: 400 kHz if connected to SOURCE pin and 300 kHz if connected to CONTROL pin. SOURCE (S) Pin: Output MOSFET source connection for the power return. Primary side control circuit common and reference point. PI-2760-070501 SHUTDOWN/ AUTO-RESTART PWM COMPARATOR CLOCK SAW 300/400 kHz CONTROLLED TURN-ON GATE DRIVER CURRENT LIMIT COMPARATOR INTERNAL UV COMPARATOR INTERNAL SUPPLY 5.8 V 4.8 V SOURCE (S) S R Q DMAX STOP SOFT- START - + CONTROL (C) LINE-SENSE (L) EXTERNAL CURRENT LIMIT (X) FREQUENCY (F) - + 5.8 V 1 V IFB RE ZC VC + - LEADING EDGE BLANKING ÷ 8 1 HYSTERETIC THERMAL SHUTDOWN SHUNT REGULATOR/ ERROR AMPLIFIER + - DRAIN (D) ON/OFF SOFT START DCMAX VBG DCMAX VBG + VT 0 OV/UV VI (LIMIT) CURRENT LIMIT ADJUST LINE SENSE SOFT START CYCLE SKIPPING STOP LOGIC OSCILLATOR Tab internally connected to SOURCE pin (See layout considerations) R Package (TO-263-7C) 12 3 4 5 7 CL X S F D F S L X S D S C 4 2 3 1 P Package (DIP-8) G Package (SMD-8) 5 7 8 6 PI-4030-110507 Figure 2. Pin Configuration (Top View). |
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