Datasheet Pdf Updated - Str F6267

The STR-F6267 is a high-performance, off-line switching regulator integrated circuit (IC) manufactured by Sanken. It is primarily designed for use in power supply circuits, such as AC/DC adapters and battery chargers, where efficiency and compact design are critical. Key Technical Specifications

The updated datasheet for the STR-F6267 highlights several integrated components that streamline power supply design:

Integrated Power MOSFET: Combines a power MOSFET with a current-mode PWM controller in a single 5-pin SIP (Single In-line Package).

Protection Circuits: Includes built-in safeguards such as thermal shutdown, current limit, and soft-start to protect the device and connected components during operation.

Frequency Jittering: Features a built-in frequency jittering circuit designed to reduce EMI (electromagnetic interference) noise, which simplifies filtering requirements.

High Efficiency: Capable of achieving efficiency levels up to 95%, making it suitable for energy-sensitive applications. Common Applications str f6267 datasheet pdf updated

The STR-F6267 is a versatile component found in various consumer and industrial electronics, including: Switching Power Supplies (SMPS) LED Drivers and battery chargers AC/DC Adapters for small electronics Motor Drivers (for specific reference applications) Resources and Availability

You can find detailed technical documentation, pinout diagrams, and equivalent replacement parts through several electronic component databases:

Datasheets: Full PDF versions are available on ALLDATASHEET.COM and Veswin Electronics, providing circuit diagrams and pin voltage specifications.

Inventory & Pricing: Real-time stock levels and preferential pricing can be checked at retailers like Utsource and Jotrin Electronics. STR-F6267 Datasheet, PDF - ALLDATASHEET.COM STR-F6267 Datasheet, PDF - Datasheet Search Engine. ALLDATASHEET.COM

STR-F6267 SANKEN Discrete Semiconductors - Jotrin Electronics Common Failures & Troubleshooting Based on the Datasheet

Common Failures & Troubleshooting Based on the Datasheet

From real-world repair logs (TV power boards like the 32” brand models using STR-F6267), here are the top 3 issues:

• Symptom: Power supply cycles on/off every 2 seconds.

  • Cause: VCC capacitor (47-100µF/50V) degrades. The IC starts, drains the cap below 11V before the auxiliary winding takes over.
  • Fix: Replace C1 near Pin 3. Per the datasheet, use a low-ESR type at 105°C.

• Symptom: No output, VCC stuck at 16V but no switching.

  • Cause: FB pin is pulled high externally or the internal OLP is triggered.
  • Fix: Measure voltage on Pin 4 (FB). If > 4.5V, the secondary feedback loop is open. Check the opto-coupler.

• Symptom: Blown MOSFET without visible short.

  • Cause: Excessive drain spikes due to a failing snubber diode or capacitor.
  • Fix: Ensure the RCD snubber uses a fast recovery diode (not 1N4007). The datasheet recommends a 1kV/1A diode.

Internal Block Diagram (Updated)

Inside the STR F6267, four major functional blocks are integrated: Symptom: Power supply cycles on/off every 2 seconds

1. Start-up Circuit: A high-voltage current source that charges the external VCC capacitor.
2. Logic Controller: Includes quasi-resonant detection, frequency limiters (20kHz–120kHz), and burst mode logic.
3. Current Sense & Protection: Compares FB voltage with internal ramp and triggers OCP/OLP.
4. Power MOSFET: The final switching stage connected directly to the Drain.

When the FB pin voltage drops below 0.4V (due to low load), the IC enters burst oscillation, skipping several switching cycles to reduce power.

Why the STR F6267? Key Features

Before diving into the pinout, let’s summarize why the STR-F6267 remains in high demand, especially for LCD TV power supplies, audio amplifiers, and industrial auxiliary power units.

• Quasi-Resonant Operation: Reduces switching losses and EMI, improving efficiency (typically >85%).
• Built-in MOSFET: Contains a highly rugged 650V / 8A power MOSFET with low Rds(on).
• Multi-Mode Control: Switches between PWM (Pulse Width Modulation) and burst mode for optimal efficiency at light loads.
• Protection Features:
  • Pulse-by-pulse overcurrent protection (OCP)
  • Overvoltage protection (OVP) on VCC pin
  • Overload protection (OLP) – auto-restart or latch mode
  • Thermal shutdown (TSD)
• Standby Power: <100mW in burst mode, meeting modern eco-standards.

2. Pin Configuration & Functions (Typical 5‑pin TO‑220 or DIP‑8)

| Pin | Name | Function | |-----|--------|------------------------------------------| | 1 | FB/OLP | Feedback input & overload protection | | 2 | S/OCP | Source pin for current sense & OCP | | 3 | VCC | Supply voltage (startup & operation) | | 4 | GND | Ground | | 5 | DRAIN | Internal MOSFET drain & HV startup |

Note: Some variants have additional NC pins. Verify with the updated datasheet.