Overview
The FSL136MRTWDTU, produced by onsemi, is an integrated Pulse Width Modulation (PWM) controller and SENSEFET specifically designed for high-performance offline Switch-Mode Power Supplies (SMPS). This device combines an avalanche-rugged SENSEFET with a current-mode PWM control block, offering a comprehensive solution with minimal external components. It is optimized for applications requiring high efficiency, low standby power, and reduced component count, size, and weight.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Drain-Source Breakdown Voltage (BVDSS) | - | - | 650 | V |
| Drain-Source On-State Resistance (RDS(ON)) | 3.5 | 4.0 | - | Ω |
| Switching Frequency (fOSC) | 61 | 67 | 73 | kHz |
| Maximum Duty Cycle (DMAX) | 71 | 77 | 83 | % |
| Peak Current Limit (ILIM) | 1.89 | 2.15 | 2.41 | A |
| Operating Supply Current (IOP) in Burst Mode | 0.3 | 0.4 | 0.5 | mA |
| Maximum Junction Temperature (TJ) | - | - | 125 | °C |
| Package Type | - | - | TO-220F 6-Lead | - |
Key Features
- Integrated avalanche-rugged SENSEFET and current-mode PWM control block.
- Advanced soft burst-mode operation for low standby power and low audible noise.
- Random frequency fluctuation for low EMI.
- Pulse-by-pulse current limit and various protection functions including Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with hysteresis, and Under-Voltage Lockout (UVLO) with hysteresis.
- Low operating current (0.4 mA) in burst mode.
- Internal startup circuit and built-in soft-start (15 ms).
- Auto-restart mode.
- Leading-Edge Blanking (LEB) to prevent incorrect feedback operation due to high-current spikes.
Applications
The FSL136MRTWDTU is suitable for various power supply applications, including:
- Power supplies for set-top boxes and home appliances.
- DVD combination units.
- Offline switch-mode power supplies (SMPS) requiring high efficiency and minimal external components).
Q & A
- What is the primary function of the FSL136MRTWDTU?
The FSL136MRTWDTU is an integrated Pulse Width Modulation (PWM) controller and SENSEFET designed for high-performance offline Switch-Mode Power Supplies (SMPS)).
- What are the key protection features of the FSL136MRTWDTU?
The device includes Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with hysteresis, and Under-Voltage Lockout (UVLO) with hysteresis).
- What is the typical switching frequency of the FSL136MRTWDTU?
The typical switching frequency is around 67 kHz).
- What is the maximum duty cycle of the FSL136MRTWDTU?
The maximum duty cycle is approximately 77%).
- What is the peak current limit of the FSL136MRTWDTU?
The peak current limit is around 2.15 A).
- What is the operating supply current in burst mode?
The operating supply current in burst mode is typically 0.4 mA).
- What is the maximum junction temperature of the FSL136MRTWDTU?
The maximum junction temperature is 125°C).
- What package type is the FSL136MRTWDTU available in?
The device is available in a TO-220F 6-Lead package).
- What are the benefits of using the FSL136MRTWDTU compared to discrete solutions?
It reduces total component count, design size, and weight while increasing efficiency, productivity, and system reliability).
- Does the FSL136MRTWDTU have built-in soft-start and auto-restart features?
Yes, it includes a built-in soft-start feature (15 ms) and an auto-restart mode).
