STR-A6252 Datasheet – Flyback Switching Regulator IC
Universal-Input/15 W 50 kHz Flyback Switching Regulators
STR-A6252 overview
The STR-A6252 is a Universal-Input/15 W 50 kHz Flyback Switching Regulators made by Allegro MicroSystems, supplied in a DIP 8 type package. The absolute maximum ratings table on this page lists the 9 limits from the manufacturer's datasheet that must not be exceeded. This page brings together the STR-A6252 pinout and maximum ratings, with the full datasheet PDF to preview below or download.
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 hyster- esis, 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
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 V DSS 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)
- 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
| Name | Description |
|---|---|
| S/OCP | Source/OCP terminal |
| FM/SS | FM/Soft start terminal |
| GND | Ground terminal |
| FB /CC/OLP | FB/CC/OLP terminal |
| VCC | Power supply terminal |
| D | Drain terminals |
Absolute maximum ratings
| Parameter | Value |
|---|---|
| Control Supply Voltage, VCC | 36V |
| Drain-Source Voltage, VDSS | 650V |
| Drain Switching Current, IDSTR-A6251STR-A6252 | 2.5 A3.0 A |
| Peak Drain Switching Current, IDMSTR-A6251STR-A6252 | 2.5 A3.0 A |
| 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 |
| MOSFET Channel TempTJ | +150°C |
| Internal Frame Temp., TF | +125°C |
| Storage Temperature Range,TS | -40°C to +125°C |
STR-A6252 applications
- PWM Controller IC
- Switching Power Supply
- AC/DC Converters
- LED Drivers
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