Overview
The FSL136MR, produced by onsemi, is an integrated Pulse Width Modulator (PWM) and SENSEFET® designed for high-performance offline Switch-Mode Power Supplies (SMPS). This device combines an avalanche-rugged SENSEFET with a current-mode PWM control block, making it ideal for applications requiring minimal external components. The FSL136MR is optimized for efficiency, productivity, and system reliability, particularly in the design of cost-effective flyback converters.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Temperature Range | °C | -40 | 105 | |
| Switching Frequency | kHz | 61 | 67 | 73 |
| Maximum Duty Cycle | % | 71 | 77 | 83 |
| UVLO Threshold Voltage | V | 11 | 12 | 13 |
| Peak Current Limit | A | 1.89 | 2.15 | 2.41 |
| Standby Power Consumption | mW | < 50 | ||
| Internal Soft-Start Time | ms | 10 | 15 | 20 |
| Junction-to-Ambient Thermal Resistance | °C/W | 80 |
Key Features
- Internal Avalanche-Rugged SENSEFET (650 V)
- Under 50 mW Standby Power Consumption at 265 Vac, No-load Condition with Burst Mode
- Precision Fixed Operating Frequency with Frequency Modulation for Attenuating EMI
- Internal Startup Circuit
- Built-in Soft-Start: 15 ms
- Pulse-by-Pulse Current Limit
- Various Protection: Over Voltage Protection (OVP), Overload Protection (OLP), Output-Short Protection (OSP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown Function with Hysteresis (TSD)
- Auto-Restart Mode
- Under-Voltage Lockout (UVLO)
- Low Operating Current: 1.8 mA
- Adjustable Peak Current Limit
Applications
- SMPS for VCR, STB, DVD & DVCD Players
- SMPS for Home Appliances
- Adapter Applications
Q & A
- What is the FSL136MR?
The FSL136MR is an integrated Pulse Width Modulator (PWM) and SENSEFET® designed for high-performance offline Switch-Mode Power Supplies (SMPS).
- What are the key features of the FSL136MR?
The FSL136MR includes features such as an internal avalanche-rugged SENSEFET, precision fixed operating frequency, internal startup circuit, built-in soft-start, pulse-by-pulse current limit, and various protection mechanisms.
- What is the operating temperature range of the FSL136MR?
The operating temperature range of the FSL136MR is from -40°C to 105°C.
- What is the typical switching frequency of the FSL136MR?
The typical switching frequency of the FSL136MR is 67 kHz.
- How does the FSL136MR handle over-voltage protection?
The FSL136MR employs an over-voltage protection (OVP) circuit that terminates switching operation if the VCC exceeds 24 V.
- What is the purpose of the Leading-Edge Blanking (LEB) in the FSL136MR?
The Leading-Edge Blanking (LEB) in the FSL136MR is used to counter the high-current spike through the SENSEFET at startup, preventing incorrect feedback operation.
- How can the peak current limit be adjusted in the FSL136MR?
The peak current limit can be adjusted by adding an external resistance (Rx) to the IPK pin, which forms a parallel resistance with the internal 6 kΩ resistance.
- What is the burst mode operation in the FSL136MR?
The burst mode operation in the FSL136MR alternately enables and disables switching of the SENSEFET to reduce switching loss in standby mode.
- What are the typical applications of the FSL136MR?
The FSL136MR is typically used in SMPS for VCR, STB, DVD & DVCD players, home appliances, and adapter applications.
- Is the FSL136MRG still in production?
No, the FSL136MRG is obsolete and no longer manufactured. However, the FSL136MR is available as a substitute.
