650V Integrated Power Switch with Quasi-Resonant Operation for 48Watt offline flyback converters

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Overview

A Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for quasi-resonant operation and Alternating Valley Switching (AVS). The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading- Edge Blanking (LEB), optimized gate driver, internal softstart, temperature-compensated precise current sources for a loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSQ-series can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost-effective designs of quasi-resonant switching flyback converters.

  • LCD TV
  • Optimized for Quasi-Resonant Converters (QRC)
  • Low EMI through Variable Frequency Control and AVS (Alternating Valley Switching)
  • High-Efficiency through Minimum Voltage Switching
  • Narrow Frequency Variation Range over Wide Load and Input Voltage Variation
  • Advanced Burst-Mode Operation for Low Standby Power Consumption
  • Simple Scheme for Sync Voltage Detection
  • 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, Output Short Protection (OSP)
  • Under-Voltage Lockout (UVLO) with Hysteresis
  • Internal Startup Circuit
  • Internal High-Voltage Sense FET (650V)
  • Built-in Soft-Start (17.5ms)

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CAD Models

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Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Control Mode

fsw Typ (kHz)

fJitter Typ (%)

Stand-by Mode

RDS(ON) Typ (Ω)

V(BR)DSS Max (V)

IPeak (mA)

HV Start-up Min (V)

DSS (mA)

UVLO

Short Circuit Protection

Over Power Compensation

Brown-out

Latch

Reference Price

FSQ0465RSLDTU

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Obsolete

CAD Model

Pb

A

H

P

TO-220-6

NA

0

TUBE

400

N

Current Mode

Variable

-

-

3.5

650

1800

Yes

-

Yes

Yes

-

-

No

Price N/A

More Details

FSQ0465RSWDTU

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Last Shipments

CAD Model

Pb

A

H

P

TO-220-6

NA

0

TUBE

400

N

Current Mode

Variable

-

-

3.5

650

1800

Yes

-

Yes

Yes

-

-

No

Price N/A

More Details

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