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High-Performance Power ICs and Hall-Effect Sensors
Related Links:
Datasheets:
STR-W6753: Universal-Input/58 W Off-Line Quasi-Resonant Flyback Switching Regulator (PDF),
STR-W6754: Universal-Input/100 W Off-Line Quasi-Resonant Flyback Switching Regulator (PDF),
STR-W6756: Universal-Input/140 W Off-Line Quasi-Resonant Flyback Switching Regulator (PDF)
Selection Guides:
Off-Line Flyback Regulators
Technical Publications:
Off-Line Quasi-Resonant Switching Regulators (PDF)
Press Releases:
STR-A6100 and STR-W6700 Series: Allegro Continues to Expand Power Management Product Line
Design Support Tools:
STR-A6100 and STR-W6700 Reference Designs,
APEKW6754-U5 Demonstration Board,
STR-A6100 and STR-W6700 Design Aid Software
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STR-W6753, STR-W6754, and STR-W6756
Quasi-Resonant Flyback Switching Regulator
| 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 |
Features and Benefits
- 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
Description
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.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Distributor Stock | Samples |
|---|---|---|---|---|---|---|---|
| STR-W6753 | 8-lead TO-220 | Yes | -- | -20 °C to 115 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-W6754 | 8-lead TO-220 | Yes | -- | -20 °C to 115 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-W6756 | 8-lead TO-220 | Yes | -- | -20 °C to 115 °C | new |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.