High-voltage resonant controller

The L6599 is a double-ended controller specific for the resonant half-bridge topology. It provides 50 % complementary duty cycle: the high-side switch and the low-side switch are driven ON\\OFF 180° out-of-phase for exactly the same time.

Output voltage regulation is obtained by modulating the operating frequency. A fixed deadtime inserted between the turn-OFF of one switch and the turn-ON of the other one guarantees soft-switching and enables high-frequency operation.

To drive the high-side switch with the bootstrap approach, the IC incorporates a high-voltage floating structure able to withstand more than 600 V with a synchronous-driven high-voltage DMOS that replaces the external fast-recovery bootstrap diode.

The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.

At start-up, to prevent uncontrolled inrush current, the switching frequency starts from a programmable maximum value and progressively decays until it reaches the steady-state value determined by the control loop. This frequency shift is non linear to minimize output voltage overshoots; its duration is programmable as well.

The IC can be forced to enter a controlled burst-mode operation at light load, so as to keep converter's input consumption to a minimum.

IC's functions include a not-latched active-low disable input with current hysteresis useful for power sequencing or for brownout protection, a current sense input for OCP with frequency shift and delayed shutdown with automatic restart.

A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current. Their combination offers complete protection against overload and short circuits. An additional latched disable input (DIS) allows easy implementation of OTP and/or OVP.

An interface with the PFC controller is provided that enables to switch off the pre-regulator during fault conditions, such as OCP shutdown and DIS high, or during burst-mode operation.

Key Features

  • 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity
  • Non-linear soft-start for monotonic output voltage rise
  • DIP-16, SO-16N packages
  • -300/800 mA high-side and low-side gate drivers with UVLO pull-down
  • Burst-mode operation at light load
  • Latched disable input
  • 50 % duty cycle, variable frequency control of resonant half-bridge
  • Up to 500 kHz operating frequency
  • High-accuracy oscillator
  • Interface with PFC controller
  • Input for power-ON/OFF sequencing or brownout protection
  • Two-level OCP: frequency-shift and latched shutdown

Resources

Technical Documentation

Product Specifications
Description Version Size
DS4739 DS4739: High-voltage resonant controller 3.1 633 KB
Application Notes
Description Version Size
AN2644 AN2644: An introduction to LLC resonant half-bridge converter 2.0 1 MB
AN2450 AN2450: LLC resonant half-bridge converter design guideline 6.0 746 KB

Presentations & Training Material

Presentations
Description Version Size
Primary side regulation controllers portfolio 1 MB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 05.2016 3 MB

Tools and Software

Evaluation Tools
Solution Evaluation Tools
Support & Community


Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L6599DTR SO-16 Tape And Reel NRND 0.836 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
L6599D SO-16 Tube NRND 0.836 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6599DTR NRNDSO-16IndustrialEcopack2 0 0
L6599D NRNDSO-16IndustrialEcopack2 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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