IC manufacturers Onsemi

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Onsemi FAN7631SJX

Advanced Pulse Frequency Modulation(PFM)Controller for Half-Bridge Resonant Converters

Overview

TopologyHalf-Bridge Converter symmetrical isolated
Input voltage90-265 V
Switching frequency10-600 kHz
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), InternalThermal Shutdown (TSD), and High Precise Line Under Voltage Lockout (LUVLO)
  • Level-Change OCP Function During Startup

Remarks

  • Refer page no-16

Typical applications

  • Adapters
  • PDP and LCD TVS
  • Desktop PCs and Servers
  • Telecom power supplies
  • Video Game Consoles

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
Q
(%)
IR
(mA)
RDC max.
(Ω)
IR
(mA)
Samples
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Order Code Data­sheet Simu­lation
7447905SPEC
7447076SPEC
744825510
750342045SPEC
750341924SPEC
750341925SPEC
750341926SPEC
750341927SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
Q
(%)
IR
(mA)
RDC max.
(Ω)
IR
(mA)
Samples