STR-A6252M
Description
Sanken Power Devices from Allegro MicroSystems
STR-A6252M
Universal-Input 20 W 67 kHz Flyback Switching Regulators
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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.
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