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reference designFAN7631

Onsemi FAN7631

Advanced PFM Controller for Half-Bridge Resonant Converter

Overview

TopologyPower Factor Correction
Input voltage90-265 V
Switching frequency10-600 kHz
Output 1400 V / 1 A
IC revision1.0.2

Description

The FAN7631 is a pulse-frequency modulation controller for high-efficiency half-bridge resonant converters that includes a high-side gate drive circuit, an accurate current-controlled oscillator, and various protection functions. The FAN7631 features include variable dead time, high operating frequency up to 600kHz, protections such as LUVLO, and a selectable latch or A/R protection using the LS pin for user convenience.

The Zero-Voltage-Switching (ZVS) technique reduces the switching losses and improves the efficiency significantly. ZVS also reduces the switching noise noticeably, which allows a small Electromagnetic Interference (EMI) filter.

Offering everything necessary to build a reliable and robust resonant converter, the FAN7631 simplifies designs and improves productivity and performance. The FAN7631 can be applied to resonant converter topologies such as series resonant, parallel resonant, and LLC resonant converters.

Features

  • Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topologies
  • High Efficiency with Zero-Voltage-Switching (ZVS)
  • Up to 600kHz Operating Frequency
  • Built-in High-Side Gate Driver
  • High Gate-Driving Current: +500mA/-1000mA
  • Programmable Dead Time with a Resistor
  • Pulse Skipping and Burst Operation for Frequency Limit (Programmable) at Light-Load Condition
  • Simple Remote On/Off Control with Latch or Auto-Restart (A/R) Using FI or LS Pin
  • Protection Functions: Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD), and High Precise Line Under Voltage Lockout (LUVLO)
  • Level-Change OCP Function During Startup

Typical applications

  • PDP and LCD TVs
  • Adapters
  • Desktop PCs and Servers
  • Video Game Consoles
  • Teelecom Power Supplies

More information

Products

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L(µH)
Q
IR(mA)
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7447905
SPECWE-MI SMT Multilayer Inductor, 1 µH, 45
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-MI SMT Multilayer Inductor
Inductance1 µH
Q-Factor45 
Rated Current50 mA
DC Resistance0.4 Ω
Rated Current50 mA
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7447076
SPECWE-FI Leaded Toroidal Line Choke, 150 µH, –
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Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-FI Leaded Toroidal Line Choke
Inductance150 µH
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DC Resistance0.045 Ω
Rated Current6100 mA
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750341924
SPECPower Transformer, –, –
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Status Activei| Production is active. Expected lifetime: >10 years.
Product series Power Transformer
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750341925
SPECPower Transforme, –, –
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Status Activei| Production is active. Expected lifetime: >10 years.
Product series Power Transforme
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750341926
SPECPower Inductor, –, –
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Status Activei| Production is active. Expected lifetime: >10 years.
Product series Power Inductor
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750341927
SPECPower Transformer, –, –
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Status Activei| Production is active. Expected lifetime: >10 years.
Product series Power Transformer
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