Overview
The FSL4110LRN 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) with minimal external components. It features a built-in high-voltage power regulator, eliminating the need for an auxiliary bias winding. The integrated PWM controller includes a fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, soft-start, and temperature-compensated precise current sources for loop-compensation, along with various protection circuitries.
This device reduces total cost, component count, PCB size, and weight compared to discrete MOSFET and PWM controller solutions, while increasing efficiency, productivity, and system reliability. It provides a cost-effective platform for designing flyback converters.
Key Specifications
| Parameter | Conditions | Min | 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 |
| CISS (Input Capacitance) | VDS = 25 V, VGS = 0 V, f = 1 MHz | 367 | 477 | - | pF |
| COSS (Output Capacitance) | - | 37.5 | 48.8 | - | pF |
| IOP (Operating Supply Current) | VCC = 14 V, VFB = 0 V | 0.40 | 0.50 | - | mA |
| IOPS (Operating Switching Current) | VCC = 14 V, VFB = 2 V | 1.00 | 1.35 | - | mA |
| ISTART (Start Current) | VCC = 11 V (Before VCC Reaches VSTART) | 160 | 240 | - | µA |
| ICH (Startup Charging Current) | VCC = VFB = 0 V, VSTR = 40 V | 1.5 | 2.0 | - | mA |
| VSTR (Minimum VSTR Supply Voltage) | CVCC = 0.1 µF, VSTR Sweep | - | - | 26 | V |
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
- 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 offline applications
- Electric Metering SMPS
- Auxiliary Power Supply for 3-Phase Input Industrial Systems
- Flyback Converters
Q & A
- What is the primary function of the FSL4110LRN?
The FSL4110LRN 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 FSL4110LRN?
The maximum drain-source breakdown voltage is 1000 V.
- What is the typical operating frequency of the FSL4110LRN?
The typical operating frequency is 50 kHz.
- Does the FSL4110LRN require an auxiliary bias winding?
No, the FSL4110LRN can be supplied through an integrated high-voltage power regulator without an auxiliary bias winding.
- What protection features are included in the FSL4110LRN?
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.
- What is the purpose of the Leading-Edge Blanking (LEB) circuit in the FSL4110LRN?
The LEB circuit inhibits the PWM comparator for a short period after the SenseFET is turned on to counter high-current spikes caused by primary-side capacitance and secondary-side rectifier reverse recovery.
- What are the benefits of using the FSL4110LRN compared to discrete MOSFET and PWM controller solutions?
The FSL4110LRN reduces total cost, component count, PCB size, and weight while increasing efficiency, productivity, and system reliability.
- What is the operating junction temperature range of the FSL4110LRN?
The operating junction temperature range is -40°C to 125°C.
- What are the typical applications of the FSL4110LRN?
Typical applications include SMPS for electric metering, auxiliary power supply for 3-phase input industrial systems, and flyback converters.
- How does the FSL4110LRN minimize audible noise?
The device employs soft burst-mode operation to minimize audible noise.
- What is the restart time for the auto-restart mode of all protections in the FSL4110LRN?
The restart time is fixed at 1.6 seconds.
