Maker : Sanken Electric
Part No. : A6252M

  Datasheet PDF : A6252M.pdf
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Product Information

Sanken Power Devices from Allegro MicroSystems STR-A6252M Universal-Input 20 W 67 kHz Flyback Switching Regulators www.datasheet4u.com S Re w it gu chi lat ng ors Package DIP-8 Approximate Scale 1:1 FEATURES AND BENEFITS 67 kHz PWM with ±5% frequency jittering for EMI noise filtering and cost reduction Rugged 650 V avalanche-rated MOSFET: • Simplified surge absorption • No VDSS derating required Low RDS(on) : 2.8 Ω maximum Auto-burst mode for stand-by operation or light loads; less transformer audible noise Built-in leading edge blanking 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) The STR-A6252M is a 67 kHz PWM topology (with ±5% frequency jittering for minimum EMI) regulator specifically designed to satisfy the requirements for increased integration and reliability in flyback converters. It incorporates a primary control and drive circuit with an avalanche-rated power MOSFET. This is a higher-frequency version of the STR-A6252. Covering the power range from below 24 watts for a 230 VAC input, or to 20 watts for a universal (85 to 264 VAC) 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, provide high reliability of system design. Cycle-by-cycle current limiting, undervoltage lockout with hysteresis, overvoltage protection, and thermal shutdown protect the power supply during the normal overload and fault conditions. Overvoltage protection and thermal shutdown are latched after a short delay. The latch may be reset by cycling the input supply. Low start-up current and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features. It is provided in an 8-pin mini-DIP plastic package with pin 6 removed. The leadframe plating is pure Sb, and the package complies with RoHS. 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 28103.44-5a Always order by complete part number, e.g.: STR-A6252M STR-A6252M Universal-Input 20 W 67 kHz Flyback Switching Regulators FUNCTIONAL BLOCK DIAGRAM AND TERMINAL ASSIGNMENTS www.datasheet4u.com 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-A6252M Universal-Input 20 W 67 kHz Flyback Switching Regulators www.datasheet4u.com 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...

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