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Product overview

Description

The L6599AF is an improved revision of the previous L6599A. It is a double-ended controller specific to series-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 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 startup, 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.

At light load the IC may enter a controlled burst mode operation that keeps the converter input consumption to a minimum.

IC 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 the pre-regulator to be switched off during fault conditions, such as OCP shutdown and DIS high, or during burst mode operation.

  • All features

    • 50% duty cycle, variable frequency control of resonant half bridge
    • High accuracy oscillator
    • Up to 500 kHz operating frequency
    • Two-level OCP: frequency-shift and latched shutdown
    • Interface with PFC controller
    • Latched disable input
    • Burst mode operation at light load
    • Input for power-ON/OFF sequencing or brownout protection
    • Non-linear soft-start for monotonic output voltage rise
    • 600 V - rail compatible high-side gate driver with integrated bootstrap diode and high dv/dt immunity
    • -300/700 mA high-side and low-side gate drivers with UVLO pull-down
    • Guaranteed for temperatures as low as -50 °C

EDA Symbols, Footprints and 3D Models

STMicroelectronics - L6599AF

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Quality and Reliability

Part Number RoHS Compliance Grade Grade Material Declaration**
L6599AFD
Ecopack2
Industrial
L6599AFDTR
Ecopack2
Industrial

L6599AFD

Package:

Industrial

Material Declaration**:

PDF XML

RoHS Compliance Grade

Ecopack2

Grade

Industrial

L6599AFDTR

Package:

Industrial

Material Declaration**:

PDF XML

RoHS Compliance Grade

Ecopack2

Grade

Industrial

(**) 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.

Sample & Buy

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L6599AFDTR Available at distributors

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Active
EAR99 NEC Tape and Reel SO-16 - - CHINA
L6599AFD Available at distributors

Distributor availability of L6599AFD

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Active
EAR99 NEC Tube SO-16 - - CHINA

L6599AFDTR Active

Package:
SO-16
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L6599AFDTR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

CHINA

L6599AFD Active

Package:
SO-16
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L6599AFD

ECCN (EU):

NEC

Packing Type:

Tube

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

CHINA

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors