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FSQ321 − SMPS Power Switch(QRC), 0.5A, 650V, 8DIP/8LSOP (Green)
A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout, Leading Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with discrete MOSFET and PWM controller solutions, the FSQ-series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective designs of valley switching fly-back converters.
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Product Status/Pricing/Packaging
| Product | Product & Eco Status | *Pricing | Packaging & Packing Info | **Package Marking Convention | Qualification Support | Compliance Certificates |
|---|---|---|---|---|---|---|
| FSQ321 |
Full Production ROHS Compliant |
$0.57 | MDIP 8L Details RAIL |
Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K
Line 2:Q321
|
RTHETA (JA) :
80
°C/W RƟJC : 20 °C/W Moisture Sensitivity Level (MSL) : NA Show more... |
|
| FSQ321LX |
Full Production ROHS Compliant |
$0.64 | LSOP 8L Details TAPE REEL |
Line 1:$Y (Fairchild logo) &Z (Plant Code) &3 (3-Digit Date Code)
Line 2:Q321
|
RTHETA (JA) :
80
°C/W RƟJC : 20 °C/W Moisture Sensitivity Level (MSL) : 1 Show more... |
|
| FSQ321L |
Full Production ROHS Compliant |
$0.57 | LSOP 8L Details RAIL |
Line 1:$Y (Fairchild logo) &Z (Plant Code) &3 (3-Digit Date Code)
Line 2:Q321
|
RTHETA (JA) :
80
°C/W RƟJC : 20 °C/W Moisture Sensitivity Level (MSL) : 1 Show more... |
- Fairchild 1,000 piece Budgetary Pricing. *
- If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
- Top mark packaging information for product FSQ321 is available. **
Features
- Optimized for Valley Switching (VSC)
- Low EMI through Variable Frequency Control andInherent Frequency Modulation
- High Efficiency through Minimum Voltage Switching
- Narrow frequency Variation Range over Wide Load andInput Voltage Variation
- Advanced Burst-Mode Operation for Low StandbyPower Consumption
- Pulse-by-Pulse Current Limit
- Various Protection functions: Over Load Protection(OLP), Over Voltage Protection (OVP), AbnormalOver Current Protection (AOCP), Internal ThermalShutdown (TSD)
- Under Voltage Lock Out (UVLO) with Hysteresis
- Internal Start-up Circuit
- Internal High-Voltage Sense FET (650V)
- Built-in Soft-Start (15ms)
Applications
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Application Notes
| Application Note | Description |
|---|---|
| AN-4150 | Design Guidelines for Flyback Converters Using FSQ-Series Fairchild Power Switch (FPS™)(569 K) 14-Jun-2011 |
| AN-4146 | Design Guidelines for Quasi-Resonant Converters Using FSCQ-Series Fairchild Power Switch (FPS™)(379 K) 05-Mar-2011 |
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