Overview
The FSL4110LRLX is an integrated pulse width modulation (PWM) controller and 1000 V avalanche rugged SenseFET, specifically designed for high input voltage offline Switching Mode Power Supplies (SMPS). This device is produced by onsemi and is part of the FSL4110LR series. It combines a PWM controller with a high-voltage SenseFET, minimizing the need for external components. The integrated PWM controller includes features such as a fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, soft-start, and various protection circuits. This integration reduces total cost, component count, PCB size, and weight while increasing efficiency, productivity, and system reliability.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| BVDSS (Drain-Source Breakdown Voltage) | VGS = 0 V, ID = 250 µA | 1000 | - | - | V |
| IDSS (Zero-Gate-Voltage Drain Current) | VDS = 1000 V, VGS = 0 V | - | - | 250 | µA |
| RDS(ON) (Drain-Source On-State Resistance) | VGS = 10 V, ID = 1.0 A | - | - | 10 | Ω |
| ILIM (Peak Drain Current Limit) | di/dt = 240 mA/µs | 0.45 | 0.52 | 0.59 | A |
| VOLP (Overload Protection) | VCC = 14 V, VFB Sweep | 4.0 | 4.4 | 4.8 | V |
| VOVP (Over-Voltage Protection) | VCC Sweep | 23.0 | 24.5 | 26.0 | V |
| TSD (Thermal Shutdown Temperature) | - | 130 | 140 | 150 | °C |
| tRESTART (Restart Time After Protection) | - | - | - | 1.6 | s |
Key Features
- Built-in Avalanche Rugged 1000 V SenseFET
- Precise Fixed Operating Frequency: 50 kHz
- VCC can be supplied from either bias-winding or self-biasing through the internal high-voltage power regulator
- Soft Burst-Mode Operation minimizing audible noise
- Random Frequency Fluctuation for low EMI
- Pulse-by-Pulse Current Limit
- Various Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Under-Voltage Lockout (UVLO), and Line Over-Voltage Protection (LOVP) with Hysteresis
- Built-in Internal Startup and Soft-Start Circuit
- Fixed 1.6 s Restart Time for Safe Auto-Restart Mode of All Protections
Applications
- Switching Mode Power Supplies (SMPS) for high input voltage applications
- Electric Metering
- Auxiliary Power Supply for 3-Phase Input Industrial Systems
- Cost-effective design of flyback converters
Q & A
- What is the primary function of the FSL4110LRLX?
The FSL4110LRLX is an integrated pulse width modulation (PWM) controller and 1000 V avalanche rugged SenseFET, designed for high input voltage offline Switching Mode Power Supplies (SMPS).
- What is the maximum drain-source breakdown voltage of the FSL4110LRLX?
The maximum drain-source breakdown voltage is 1000 V.
- What protection features are integrated into the FSL4110LRLX?
The device includes Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Under-Voltage Lockout (UVLO), and Line Over-Voltage Protection (LOVP) with Hysteresis.
- How does the FSL4110LRLX handle fault conditions?
In case of a fault condition, switching is terminated, and the SenseFET remains off. The device enters an auto-restart mode with a fixed 1.6 s restart time to ensure safe operation.
- What is the operating frequency of the FSL4110LRLX?
The operating frequency is fixed at 50 kHz.
- Can the VCC be supplied through self-biasing?
- What is the thermal shutdown temperature of the FSL4110LRLX?
The thermal shutdown temperature ranges from 130°C to 150°C.
- What are the benefits of using the FSL4110LRLX compared to discrete solutions?
The FSL4110LRLX reduces total cost, component count, PCB size, and weight while increasing efficiency, productivity, and system reliability.
- What are some typical applications of the FSL4110LRLX?
Typical applications include SMPS for high input voltage, electric metering, and auxiliary power supply for 3-phase input industrial systems.
- How does the Leading-Edge Blanking (LEB) circuit function?
The LEB circuit inhibits the PWM comparator for 250 ns after the SenseFET is turned on to prevent incorrect feedback operation due to primary-side capacitance and secondary-side rectifier reverse recovery.
