L6591

Active

Current mode PWM controller for Asymmetrical Half Bridge converter topology

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  • The L6591 is a double-ended PWM controller specific to the soft-switched half bridge topology. It provides complementary PWM control, where the high-side switch is driven ON for a duty cycle D and the low-side switch for a duty cycle 1-D, with D < 50%. An externally programmable 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 user to set the operating frequency of the converter by means of an externally programmable oscillator: the maximum duty cycle is digitally clipped at 50% by a T-flip-flop, so that the operating frequency is half that of the oscillator.
    At very light load the IC enters a controlled burst mode operation that, along with the built-in non-dissipative high-voltage startup circuit and the low quiescent current, helps keep the consumption from the mains low and is compliant with energy saving recommendations.
    To allow compliance with these standards also in two-stage power-factor-corrected systems, an interface with the PFC controller is provided that enables the pre-regulator to be switched off between one burst and the following one.
    An innovative adaptive UVLO helps minimize the issues related to fluctuations of the self-supply voltage with the output load, due to the transformer's parasitic.
    IC protection functions include: not-latched input undervoltage (brownout), a first-level OCP with delayed shutdown able to protect the system during overload and short-circuit conditions (either auto-restart or latch mode can be selected) and a second-level OCP that latches off the IC when the transformer saturates or one of the secondary diodes fails short. Finally, a latched disable function allows easy implementation of OTP or OVP.
    Programmable soft-start and digital leading-edge blanking on the current sense input pin complete the equipment of the IC.

    Key Features

    • Complementary PWM control for soft-switched half bridge with programmable deadtime
    • Up to 500 kHz operating frequency
    • Onboard high-voltage startup
    • Advanced light load management
    • Adaptive UVLO
    • Pulse-by-pulse OCP
    • OLP (latched or autorestart)
    • Transformer saturation detection
    • Interface with PFC controller
    • Latched disable input
    • Input for power-on sequencing or brownout protection
    • Programmable soft-start
    • 4% precision external reference
    • 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity
    • SO16N package

Circuit Diagram

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Technical Documentation

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      EVL6591-90WADP: 90 W AC-DC asymmetrical half-bridge adapter using L6591 and L6563
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      AN2852
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Presentations & Training Material

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Publications and Collaterals

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6591
Active
SO-16 Industrial Ecopack2
L6591TR
Active
SO-16 Industrial Ecopack2

L6591

Package:

SO-16

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6591TR

Package:

SO-16

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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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min
max
L6591TR Available at 3 distributors

Distributor availability ofL6591TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2493 1 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
MOUSER WORLDWIDE 2426 1 Order Now

Distributor reported inventory date: 2020-08-02

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DIGIKEY

Stock

2493

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

2426

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

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Active
EAR99 NEC Tape And Reel SO-16 - - PHILIPPINES 1.362 / 1k
L6591 Available at 3 distributors

Distributor availability ofL6591

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 221 0 Order Now
MOUSER WORLDWIDE 724 1 Order Now
Farnell Element14 EUROPE 570 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

Newark Element14

Stock

221

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

724

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

570

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-02

Buy now
Active
EAR99 NEC Tube SO-16 - - PHILIPPINES 1.362 / 1k

L6591TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.362 / 1k

Distributor availability ofL6591TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2493 1 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
MOUSER WORLDWIDE 2426 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

2493

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

2426

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.362 / 1k

Country of Origin

PHILIPPINES

L6591

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.362 / 1k

Distributor availability ofL6591

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 221 0 Order Now
MOUSER WORLDWIDE 724 1 Order Now
Farnell Element14 EUROPE 570 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

Newark Element14

Stock

221

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

724

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

570

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.362 / 1k

Country of Origin

PHILIPPINES

(*) 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