STR-W6753, STR-W6754, and STR-W6756: Quasi-Resonant Flyback Switching Regulators

The Series STR-W6700 includes quasi-resonant topology ICs designed for SMPS power supplies, showing lower EMI noise characteristics - especially at more than 2 MHz - than conventional PWM solutions. They utilize a soft switching to turn on the internal avalanche-guaranteed MOSFET at a close point to ground level (VDS bottom point) through the resonant phenomenon of a primary inductor and resonant capacitor. The package is a fully molded TO-220, which contains the controller chip and MOSFET, and enables the output power up to 140 W at universal input, or 240 W at 230 VAC input. The bottom-skip function skips the first bottom of VDS and turns on the MOSFET at the second bottom point to minimize increase of operational frequency at light output load, improving system-level efficiency over the entire load condition. Two standby functions reduce the input power at very light output load conditions; one is an auto-burst mode operation internally triggered by sensing on-time, and the other is a manual standby mode that is executed by clamping the secondary output.

Max. PO (W) at Max. MOSFET Part Number
230 V ac 85 ~ 265 V ac rDS(on) (Ω)
120 58 1.70 STR-W6753
160 100 0.96 STR-W6754
240 140 0.73 STR-W6756

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  • Rugged 650 V Avalanche-Rated MOSFET
    Simplified Surge Absorption
    No VDSS Derating Required
  • Choice of rDS(on)
  • Two Operational Modes by Automatic Switching:
    Quasi-Resonant Mode for Normal Operation
    Burst Mode for Standby Operation or Light Loads
  • Automatic or Manually Triggered Burst Standby
    Input Power <0.1 W at No Load
  • Low Operating Current (6 mA typ)
  • Auto-Bias Function
    Stable Burst Operation Without Generating Interference
  • Internal Off-Timer Circuit
  • Built-In Constant-Voltage Drive
  • Multiple Protections:
    Pulse-by-Pulse Overcurrent Protection
    Overload Protection with Auto Recovery
    Latching Overvoltage Protection
    Undervoltage Lockout with Hysteresis
  • RoHS Compliant

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Product Image Functional Block Diagram Package

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
STR-W6753 8-lead TO-220 -20°C to 115°C Yes View Data New Contact your
local sales rep
Check Stock
STR-W6754 8-lead TO-220 -20°C to 115°C Yes View Data New Contact your
local sales rep
Check Stock
STR-W6756 8-lead TO-220 -20°C to 115°C Yes View Data New Contact your
local sales rep
Check Stock

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