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Datasheets:
STR-X6757: Off-Line Quasi-Resonant Switching Regulators (PDF),
STR-X6768N: Off-Line Quasi-Resonant Switching Regulators (PDF),
STR-X6769: Off-Line Quasi-Resonant Switching Regulators (PDF),
STR-X6759N: Off-Line Quasi-Resonant Switching Regulators (PDF),
STR-X6729: Off-Line Quasi-Resonant Switching Regulators (PDF),
STR-X6737: Off-Line Quasi-Resonant Switching Regulators (PDF)
Selection Guides:
Off-Line Flyback Regulators
Technical Publications:
STR-X6700 Series Off-Line Quasi-Resonant Switching Regulators (PDF)
Press Releases:
STR-X6700 Series: Allegro MicroSystems Announces New Switching Regulator Series
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STR-X6700 Series
Off-Line Quasi-Resonant Switching Regulators
| Type # | MOSFET VDSS(V) | RDS(on)(Max) (Ω) | VAC Input (V) | POUTa(W) |
|---|---|---|---|---|
| STR-X6729b | 450 | 0.189 | 120 | 460 |
| STR-X6737 | 500 | 0.36 | 120 | 280 |
| STR-X6757 | 650 | 0.62 | Wide | 165 |
| 230 | 320 | |||
| STR-X6759Nb | 0.385 | Wide | 250 | |
| 230 | 460 | |||
| STR-X6768Nb | 800 | 1.00 | Wide | 250 |
| 230 | 460 | |||
| STR-X6769 | 0.66 | Wide | 210 | |
| 230 | 310 | |||
| a The listed output power represents thermal ratings, and the peak output power, POUT , is obtained by 120% to 140% of the thermal rating value. In case of low output voltage and narrow on-duty cycle, the POUT (W) becomes lower than the above. | ||||
| b Auto-standby mode not included. | ||||
Features and Benefits
- Auto standby mode (burst oscillation) or manual standby mode (UVLO intermittent oscillation) in the standby mode.
- In addition to the standard quasi-resonant operation, a bottom-skip mode is available for increased efficiency from light to medium load.
- Soft-start operation at start-up.
- Reduced switching noise (compared to conventional PWM hard-switching solution) with a step-drive function.
- Built-in avalanche-energy-guaranteed power MOSFET (to simplify surge-absorption circuit; no VDSS derating is required).
- Overcurrent protection (OCP), overvoltage protection (OVP), overload protection (OLP), and maximum On-time control circuits are incorporated; OVP and OLP go into a latched mode.
Applications
- Set Top Box
- LCD PC monitor, LCD TV
- Printer, Scanner
- SMPS power supplies
Description
The STR-X6700 series integrates a quasi-resonant control IC and a MOSFET with avalanche guarantee. In normal operation, the device provides high efficiency and low EMI noise with bottom-skip quasi-resonant operation during light output loads. Low power consumption is also achieved by Auto-standby mode (not available in the STR-X6729, STR-X6759N, or STR-X6768N) or manual standby mode (external trigger).
The device is supplied in a seven-pin fully-molded TO-3Pstyle package, which is suitable for downsizing and standardizing of an SMPS by reducing external component count and simplifying circuit design.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Distributor Stock | Samples |
|---|---|---|---|---|---|---|---|
| STR-X6729 | 7-lead TO-3P | Yes | -- | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-X6737 | 7-lead TO-3P | Yes | -- | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-X6757 | 7-lead TO-3P | Yes | -- | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-X6759N | 7-lead TO-3P | Yes | -- | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-X6768N | 7-lead TO-3P | Yes | -- | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| STR-X6769 | 7-lead TO-3P | Yes | -- | -20 °C to 85 °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.