Maker : Allegro MicroSystems
Part No. : A6259H

  Datasheet PDF : A6259H.pdf
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Product Information

Sanken Power Devices www.DataSheet4U.com from Allegro MicroSystems STR-A6259H Universal-Input 13 W 100 kHz Flyback Switching Regulators S Re w it gu chi lat ng ors Soft start and low start-up current; start-up circuit disabled in operation Auto-burst stand-by (intermittent operation) input power <0.1 W at no load Built-in constant-voltage/constant current (CV/CC) Multiple protections: • Pulse-by-pulse overcurrent protection (OCP) • Overload protection (OLP) with auto restart • Latching overvoltage protection (OVP) • Undervoltage lockout (UVLO) with hysteresis • Latching thermal shutdown (TSD) All performance characteristics given are typical values for circuit or system baseline design only and are at the nominal operating voltage and an ambient temperature of +25°C, unless otherwise stated. Datasheet 28103.44-6b The STR-A6259H is a 100 kHz PWM topology (with ±5% frequency jittering for minimum EMI) regulator specifically designed to satisfy the requirements for increased integration and reliability Package DIP-8 in flyback converters. It incorporates a primary control and drive circuit with an avalanche-rated power MOSFET. Covering the power range from below 17 watts for a 230 VAC input, or to 13 watts for a universal (85 to 264 VAC) Approximate Scale 1:1 input, this device can be used in a wide range of applications, from DVD players and VCR player/recorders to ac adapters for cellular phones and digital cameras. An auto-burst standby function reduces power consumption at light load, while multiple protections, including the avalanche-energy guaranteed MOSFET, FEATURES AND BENEFITS provide high reliability of system design. 100 kHz PWM with ±5% frequency jittering for EMI noise Cycle-by-cycle current limiting, undervoltage lockout with filtering cost reduction hysteresis, overvoltage protection, and thermal shutdown protect the power supply during the normal overload and fault conditions. www.DataSheet4U.com Rugged 650 V avalanche-rated MOSFET: Overvoltage protection and thermal shutdown are latched after a • Simplified surge absorption short delay. The latch may be reset by cycling the input supply. Low start-up current and a low-power standby mode selected • No VDSS derating required from the secondary circuit completes a comprehensive suite of Low RDS(on) : 6 Ω maximum features. Auto-burst mode for stand-by operation or light loads; less It is provided in an 8-pin mini-DIP plastic package with pin 6 removed. The leadframe plating is pure Sb, and the package transformer audible noise complies with RoHS. Built-in leading edge blanking Always order by complete part number, e.g.: STR-A6259H STR-A6259H Universal Input 13 W 100 kHz www.DataSheet4U.com Flyback Switching Regulators FUNCTIONAL BLOCK DIAGRAM AND TERMINAL ASSIGNMENTS Vcc 5 8 D D RESET OVP 32V 7.2V R Internal BIAS UVLO 13.4V/10V Istartup =1.1mA 7 TSD 125°C Delay 10 µs S Q Drive PWM OSC RQ S 1 S/OCP CV/CC Feedback Control Soft Start FM/SS 2 OCP Frequency Modulation OLP LEB 4 FB/CC /OLP 3 GND Number 1 2 3 4 Name S/OCP FM/SS GND FB /CC/OLP Description Source/OCP terminal FM/Soft start terminal Ground terminal FB/CC/OLP terminal Functions MOSFET Source/Overcurrent protection Capacitor connection terminal for frequency jitter and soft start. Ground Input of constant voltage control signal / constant current operation control signal / over load protection signal Input of power supply for control circuit MOSFET drain / Input of startup current 5 7 8 VCC D Power supply terminal Drain terminals 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 S Re w it gu chi lat ng ors 2 STR-A6259H Universal Input 13 W 100 kHz www.DataSheet4U.com Flyback Switching Regulators ABSOLUTE MAXIMUM RATINGS at TA = 25°C Characteristic Drain Current1 Maximum Switching Current Single Pulse Avalanche Energy2 S/OCP Terminal Voltage Controller (MIC) Input Voltage FB/CC/OLP Terminal Voltage FM Terminal Voltage MOSFET Power Diss...

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