Maker : Allegro MicroSystems
Part No. : A6252

  Datasheet PDF : A6252.pdf
  Cross Reference : A6252 Cross Reference
  Buy Component : A6252 Find Stock and Price

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Product Information

ing rs h itc lato w gu Swww.DataSheet4U.com Re STR-A6251 AND STR-A6252 Universal-Input/15 W 50 kHz Flyback Switching Regulators The STR-A6251 and STR-A6252 are 50 kHz PWM topology (with ±5% frequency jittering for minimum EMI) regulators specifically designed to satisfy the requirements for increased integration and reliability in flyback converters. They incorporate a primary control and drive circuit with avalanche-rated power MOSFETs. The STR-A6252 features higher allowable switching current and lower on-resistance. The STR-A6251 is also available for 67 kHz operation. Covering the power range from below 21 watts or 24 watts for a 230 VAC input, or to 15 or 20 watts for a universal (85 to 264 VAC) input, these devices 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. Both devices are provided in an 8-pin mini-DIP plastic package with pin 6 removed. FEATURES AND BENEFITS ■ 50 kHz PWM with ±5% Frequency Jittering Cost Reduction of EMI Noise Filtering ■ Rugged 650 V Avalanche-Rated MOSFET Simplified Surge Absorption No VDSS Derating Required ■ Choice of rDS(on) (2.8 Ω or 3.95 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 ■ Low Operating Current (4 mA max) continued Always order by complete part number, e.g., STR-A6251 . Data Sheet 28103.42c ABSOLUTE MAXIMUM RATINGS at TA = +25°C Control Supply Voltage, VCC . . . . 36 V Drain-Source Voltage, VDSS . . . . . . 650 V Drain Switching Current, ID STR-A6251 . . . . . . . . . . . . . . 2.5 A* STR-A6252 . . . . . . . . . . . . . . 3.0 A* Peak Drain Switching Current, IDM STR-A6251 . . . . . . . . . . . . . . . 2.5 A STR-A6252 . . . . . . . . . . . . . . . 3.0 A Single-Pulse Avalanche Energy, EAS STR-A6251 . . . . . . . . . . . . . . 72 mJ STR-A6252 . . . . . . . . . . . . . 123 mJ S/OCP Voltage Range, VOCP . . . . . . . . . . . . –0.3 V to +6 V FB/CC/OLP Voltage Range, VFB/OLP . . . . . . . . . . –0.3 V to +12 V FM Voltage Range, VFM . . . . . . . . . . . . . –0.3 V to +6 V Package Power Dissipation, PD control (VCC × ICC(ON)) . . . . . 0.15 W MOSFET (VDSS × ID) . . . . . . 1.35 W total . . . . . . . . . . . . . . . . . . . . 1.5 W MOSFET Channel Temp., TJ . +150°C Internal Frame Temp., TF . . . . +125°C Storage Temperature Range, TS . . . . . . . . . . . . -40°C to +125°C * Drain switching current is limited by temperature (page 2) and safe operating area (page 4). Sanken Power Devices from Allegro MicroSystems STR-A6251 and STR-A6252 Universal-Input/15 W 50 kHz Flyback Switching Regulators www.DataSheet4U.com FUNCTIONAL BLOCK DIAGRAM ing rs h itc lato Sw egu R Vcc 5 8 D D RESET OVP 32V 7.2V R S Q Internal BIAS UVLO 13.4V/10V Istartup =1.1mA 7 TSD 125°C Delay 10 µs 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 FEATURES AND BENEFITS (cont’d) ■ Automatic Burst Stand-By (intermittent operation) Input Power <0.1 W at No Load ■ Auto-Bias Function Stable Burst Operation Without Generating Interference ■ Internal Off-Timer Circuit ■ Built-In Constant-Voltage/Cons...

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