L6566B AC-DC Converters by STMicroelectronics

Multi-mode controller for SMPS

Semiconductors - ICs
> Power Management ICs - PMIC
> PWM Controllers
Status: Active
Series: L6566B
RoHS: Compliant
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The L6566B is an extremely versatile current-mode primary controller ICs, specifically designed for high-performance offline flyback converters. It is also suited for single-stage single-switch input-current-shaping converters (single-stage PFC) for applications supposed to comply with EN61000-3-2 or JEITA-MITI regulations. Both fixed-frequency (FF) and quasi-resonant (QR) operation are supported. The user can pick either of the two depending on application needs. The device features an externally programmable oscillator: it defines converterÂ’s switching frequency in FF mode and the maximum allowed switching frequency in QR mode. When FF operation is selected, the ICs work like a standard current-mode controller with a maximum duty cycle limited at 70 % min. The oscillator frequency can be modulated to mitigate EMI emissions. QR operation, when selected, occurs at heavy load and is achieved through a transformer demagnetization sensing input that triggers MOSFETÂ’s turn-on. Under some conditions, ZVS (zero-voltage switching) can be achieved. ConverterÂ’s power capability rise with the mains voltage is compensated by line voltage feedforward. At medium and light load, as the QR operating frequency equals the oscillator frequency, a function (valley skipping) is activated to prevent further frequency rise and keep the operation as close to ZVS as possible. With either FF or QR operation, at very light load the ICs enter a controlled burst-mode operation that, along with the built-in non-dissipative high-voltage start-up circuit and the low quiescent current, helps keep low the consumption from the mains and meet energy saving recommendations. An innovative adaptive UVLO helps minimize the issues related to the fluctuations of the self-supply voltage due to transformerÂ’s parasites. The protection functions included in this device are: not-latched input undervoltage (brownout), output OVP (auto-restart or latch-mode selectable), a first-level OCP with delayed shutdown to protect the system during overload or short circuit conditions (autorestart or latch-mode selectable) and a second-level OCP that is invoked when the transformer saturates or the secondary diode fails short. A latched disable input allows easy implementation of OTP with an external NTC, while an internal thermal shutdown prevents IC overheating. Programmable soft-start, leading-edge blanking on the current sense input for greater noise immunity, slope compensation (in FF mode only), and a shutdown function for externally controlled burst-mode operation or remote ON/OFF control complete the equipment of this device.

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Prices starting from US$1.45

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RS
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705
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TME
from US$1.95
12
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EBV Elektronik
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1,600
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Avnet Silica
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1,050
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Future Electronics
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0
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Farnell
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Features

Latched or autorestart OVP
Programmable frequency modulation for EMI reduction
-600/+800 mA totem pole gate driver with active pull-down during UVLO
Brownout protection
SO16N package
Pulse-by-pulse OCP, shutdown on overload (latched or autorestart)
Line feedforward for constant power capability vs. mains voltage
Selectable multi-mode operation: fixed frequency or quasi-resonant
Advanced light load management
On-board 700 V high-voltage start-up
Adaptive UVLO
Transformer saturation detection
Low quiescent current (< 3 mA)

Last 6 months Inventory & Pricing History

Alternative Descriptions

STMicroelectronics L6566B PWM Controller | RS
IC: driver | TME
Current Mode PWM Controller 800mA 16-Pin SO N Tube | EBV Elektronik
L6566B Series 23 V 75% 300 kHz Multi-Mode Controller for SMPS - SO16N | Future Electronics
PWM CONTROLLER, 300KHZ, -0.6/0.8A, 16SO | Farnell

Frequently Asked Questions

Where can I find additional details, specifications and documents for a L6566B?

Additional datasheets, footprints and schematics for L6566B are listed on our Part Details page. You can also find images and similar parts to L6566B on this page.

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What category does L6566B fall under?

The L6566B is listed under Power Management > AC-DC Converters > PWM Controllers.

Can I view similar or alternative parts?

You can view similar parts to L6566B 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 L6566B you can contact the distributor directly for product support, shipping queries etc.

Is the L6566B RoHS compliant?

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

Which authorised distributors for L6566B have stock available?

Authorised distributors including RS, TME, EBV Elektronik, Avnet Silica and Future Electronics have stock available or on a lead time for L6566B.

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