Offline Regulators | FSL337LR

Green Mode Fairchild Buck Switch

Obsolete

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Overview

The FSL337LR integrated Pulse Width Modulator (PWM) and SenseFET is specifically designed for high-performance offline buck, buck-boost, and non-isolation flyback Switched Mode Power Supplies (SMPS) with minimal external components. This device integrates a high-voltage power regulator that enables operation without auxiliary bias winding. An internal transconductance amplifier reduces external components for the feedback compensation circuit.
The integrated PWM controller includes: 10 V regulator for no external bias circuit, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), an optimized gate turn-on / turn-off driver, EMI attenuator, Thermal Shutdown (TSD), temperature-compensated precision current sources for loop compensation, and fault-protection circuitry. Protections include: Overload Protection (OLP), Over-Voltage Protection (OVP), and Feedback Open Loop Protection (FB_OLP). FSL337LR offers good soft-start performance during startup.
The internal high-voltage startup switch and the Burst-Mode operation with very low operating current reduce the power loss in Standby Mode. As the result, it is possible to reach power loss of 120 mW without external bias and 25 mW with external bias when input voltage is 230 VAC.

  • Consumer Appliances
  • DC-DC Merchant Power Supply
  • Smart Meter

  • Built-in Avalanche-Rugged SenseFET: 700 V
  • Fixed Operating Frequency: 50 kHz
  • No-Load Power Consumption:
  • <25 mW at 230 VAC with External Bias;
  • <120 mW at 230 VAC without External Bias
  • No Need for Auxiliary Bias Winding
  • Frequency Modulation for Attenuating EMI
  • Pulse-by-Pulse Current Limiting
  • Ultra-Low Operating Current: 250 µA
  • Built-in Soft-Start and Startup Circuit
  • Adjustable Peak Current Limit
  • Built-in Transconductance (Error) Amplifier
  • Various Protections: Overload Protection (OLP), Over-Voltage Protection (OVP), Feedback Open-Loop Protection (FB_OLP), Thermal Shutdown (TSD)
  • Fixed 650 ms Restart Time for Safe Auto-Restart of All Protections

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FSL337LRN

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Obsolete

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CAD Model

Pb

A

H

P

PDIP-7

626A-01

NA

0

TUBE

3000

N

Current Mode

50kHz

-

-

4

700

1800

Yes

-

Yes

Yes

-

-

No

Price N/A

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Reliability Data

Die Related Summary Data

Device: FSL337LRN

Equivalent to wafer fab process: CMOS SUB

Product Technology

Product Technology

Equivalent Device-Hours

MTBF/MTTF in Hours

FITS

CMOS SUB

2

920154574

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Re-calculate Data

Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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