STR-A6252 Datasheet – 15W, Flyback Switching Regulator
Universal-Input/15 W 50 kHz Flyback Switching Regulator
STR-A6252 overview
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. wCwwy.DcatalSeh-eebt4yU.-cocmycle 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
| Part Number | STR-A6252 |
| Function | Universal-Input/15 W 50 kHz Flyback Switching Regulator |
| Package | DIP 8 Pin Type |
| Manufacturer | Allegro MicroSystems |
| Datasheet | Download PDF  |
Datasheet
STR-A6252 features
- 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 L or 3.95 L 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)
- 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/Constant Current
- 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)
- Molded Small-Size 8-Pin Package For Low-Height SMPS
STR-A6252 pinout
Absolute maximum ratings
| Parameter | Value |
|---|---|
| Control Supply Voltage, VCC | 36 V |
| Drain-Source Voltage, VDSS | 650 V |
| Drain Switching Current, IDSTR-A6251STR-A6252 | 2.5 A*3.0 A* |
| Peak Drain Switching Current, IDMSTR-A6251STR-A6252 | 2.5 A3.0A |
| Single-Pulse Avalanche Energy, EAS STR-A6251STR-A6252 | 72 mJ123 mJ |
| Package Power Dissipation, PDcontrol (VCC × ICC(ON) MOSFET (VDSS × ID) total | 0.15 W1.35 W1.5 W |
| SFET Channel Temp., TJ | +150°C |
| Internal Frame Temp., TF | +125°C |
| Storage Temperature Range,TS | -40°C to +125°C |
STR-A6252 applications
- Switching Power Supply Controller
- LED Driver IC
- AC-DC Converter Controller
- Energy-Efficient Appliances
More about STR-A6252
STR-A6252 Absolute Maximum Ratings
| S/OCP Voltage Range, VOCP | V to +6 V |
| FB/CC/OLP Voltage Range, VFB/OLP | V to +12 V |
| FM Voltage Range, VFM | V to +6 V |
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