Regulator

STR-W6554A Datasheet, STRW6554A Circuit – Sanken

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This is a kind of Flyback Switching Regulator.

Part Number: STR-W6554A, STRW6554A

Function: IC Regualtor ( PWM AC/DC Converter )

Package: TO-220-6 Pin ZIP Type

Manufacturer: Sanken

Image:
STR-W6554A image

Description

This is Off-Line Quasi-Resonant Flyback Switching Regulator. The STR-W6554A is a quasi-resonant PWM controller IC with an integrated power MOSFET, designed for off-line switching power supplies in a compact package. It features low standby power consumption, built-in protection functions, and low noise operation suitable for energy-efficient designs. This device is commonly used in AC-DC adapters, LCD TV power supplies, and home appliance SMPS circuits.

Features

  • Built-in high-voltage power MOSFET
  • Quasi-resonant operation for high efficiency
  • Low standby power consumption
  • Auto-restart protection for overload and short circuit
  • Overcurrent protection (OCP)
  • Overvoltage protection (OVP)
  • Thermal shutdown protection
  • Low EMI noise characteristics

Pinouts

STR-W6554A Pinouts
STRW6554A Datasheet

Applications

  • AC-DC adapters
  • LCD TV power supplies
  • Home appliance SMPS
  • Set-top box power supplies
  • Industrial auxiliary power systems

Alternative / Equivalent Products

  • STR-W6553A
  • STR-W6555A
  • ICE3BR1765J
  • FSDM0565RB
  • TNY277PN

STR-W6554A Datasheet

STRW6554A pdf

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LM78M05CMWC Datasheet PDF – 5V, Voltage Regulator

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Part Number: LM78M05CMWC

Function: 3-Terminal Positive Voltage Regulator

Package: TO-220, TO-252, and PFM D-PAK Type

Manufacturer: Texas Instruments

Image

LM78M05CMWC datasheet pdf

 

Description

The LM341 and LM78M05CMWC, LM78M05 series of three-terminal positive voltage regulators employ built-in current limiting, thermal shutdown, and safe-operating area protection which makes them virtually immune to damage from output overloads. With adequate heatsinking, they can deliver in excess of 0.5A output current. Typical applications would include local (on-card) regulators which can eliminate the noise and degraded performance associated with single-point regulation.

Key Features

  • Fixed 5V output voltage
  • Output current capability > 0.5A (with proper heatsinking)
  • No external components required for basic operation
  • Internal thermal shutdown protection
  • Internal current limiting (short-circuit protection)
  • Safe Operating Area (SOA) protection for output transistor
  • Available in multiple fixed voltage variants (5V, 12V, 15V)

Pinout

LM78M05CMWC pinout regulator

Design Considerations

  • Thermal Dissipation: Power loss = (Vin – 5V) × Iout → ensure proper heatsink
  • Dropout Margin: Maintain Vin ≥ ~7V for stable regulation
  • Efficiency: Low compared to switching regulators, especially at high Vin
  • Noise Performance: Very low output noise, suitable for analog circuits
  • Stability: Requires proper bypass capacitors close to pins

Advantages

  • Extremely simple implementation
  • Robust protection features
  • Low noise compared to switching regulators
  • High reliability and wide usage history

Limitations

  • Low efficiency at high input-output voltage differential
  • Requires thermal management at higher currents
  • Not suitable for battery-powered high-efficiency designs
  • Relatively high dropout compared to modern LDOs

Typical Applications

  • Microcontroller and logic supply (5V rail)
  • On-board regulation (point-of-load)
  • Linear post-regulation after DC-DC converters
  • Analog and mixed-signal circuits requiring low noise
  • Industrial and consumer electronics

Alternative / Equivalent Devices

  • LM7805 – Standard 1A version
  • LM1117-5.0 – Low dropout regulator
  • AMS1117-5.0 – Popular LDO alternative
  • TLV1117 – Improved LDO performance
  • DC-DC Buck Converters – For higher efficiency applications

Other data sheets are available within the file:

LM341, LM341T-12, LM341T-15, LM341T-15/NOPB, LM341T-5.0

LM78M05CMWC Datasheet PDF Download


LM78M05CMWC pdf