L6591 AC-DC Converters by STMicroelectronics

Current mode PWM controller for Asymmetrical Half Bridge converter topology


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.

Where to Buy

Prices starting from US$1.87

Distributor Stock
Logo for Farnell
Farnell
from US$2.13
940
in stock
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Logo for element14
element14
from US$2.15
940
in stock
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Logo for Avnet Silica
Avnet Silica
-
1,800
in stock
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Logo for Newark Electronics
Newark Electronics
from US$2.85
-
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Logo for Future Electronics
Future Electronics
from US$1.89
-
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Logo for Avnet America
Avnet America
from US$1.87
-
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Logo for EBV Elektronik
EBV Elektronik
-
-
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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

Alternative Descriptions

PWM CONTROLLER, 500KHZ, 22V, NSOIC-16 | element14
Current Mode PWM Controller 800mA 16-Pin SO N Tube | Avnet Silica
Pwm Controller, 500Khz, 22V, Nsoic-16 | Newark Electronics
L6591 Series 22 V 50% 500 kHz PWM Controller for ZVS Half Bridge - SOIC-16 | Future Electronics


Frequently Asked Questions

Where can I find additional details, specifications and documents for a L6591?

Additional datasheets, footprints and schematics for L6591 are listed on our Part Details page. You can also find images and similar parts to L6591 on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for L6591 on our Product Comparison page. Access via the 'View Pricing & Stock' button to view L6591 price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does L6591 fall under?

The L6591 is listed under Power Management > AC-DC Converters > PWM Controllers.

Can I view similar or alternative parts?

You can view similar parts to L6591 when available in the PWM Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the L6591 you can contact the distributor directly for product support, shipping queries etc.

Is the L6591 RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

Which authorised distributors for L6591 have stock available?

Authorised distributors including element14, Farnell, Avnet Silica, Newark Electronics and Future Electronics have stock available or on a lead time for L6591.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for L6591 often in real-time on the comparison pages.

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