L6699D AC-DC Converters by STMicroelectronics

Enhanced high-voltage resonant controller

Status: Active
Series: L6699
RoHS: Compliant
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The L6699 is a double-ended controller specific to series-resonant half bridge topology. Both LLC and LCC configurations are supported. It provides symmetrical 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. The deadtime inserted between the turn-off of one switch and the turn-on of the other one is automatically adjusted to best fit the transition times of the half bridge midpoint. 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 range of the converter by means of a high-accuracy externally programmable oscillator. At startup, in addition to the traditional frequency-shift soft-start (the switching frequency starts from a preset maximum value and then decays as far as the steady-state value determined by the control loop), a proprietary circuit controls the half bridge to prevent hard-switching from occurring in the initial cycles because of the unbalance in the V·s applied to the transformer. At light load the IC can be forced to enter a controlled burst-mode operation that keeps the converter input consumption as low as possible. IC protection functions include a current sense input for OCP with frequency shift and delayed shutdown with automatic restart. Fast shutdown with automatic restart occurs if this first-level protection cannot control the primary current. Additionally, the IC prevents the converter from working in or too close to the capacitive mode, to guarantee soft-switching. A latched disable input (DIS) can be used to implement OTP and/or OVP. The combination of these protection features offers the highest degree of safety. Other functions include a not-latched active-low disable input with current hysteresis, useful for power sequencing or for brownout protection, and an interface with the PFC controller that enables the switching-off of the pre-regulator during fault conditions or during burst-mode operation.

Prices starting from US$1.21


Distributor Starting From Stock
Logo for Newark Electronics Newark Electronics US$1.80
1,144
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Logo for element14 element14 US$1.37
1,144
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Logo for Farnell Farnell US$1.41
1,144
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Logo for Transfer Multisort Elektronik Transfer Multisort Elektronik US$2.05
93
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Logo for Future Electronics Future Electronics US$1.24
-
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Logo for Avnet America Avnet America US$1.21
-
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Features

Symmetrical duty cycle, variable frequency control of resonant half bridge
Self-adjusting adaptive deadtime
High-accuracy oscillator
2-level OCP: frequency-shift and immediate shutdown
Interface with PFC controller
Anti-capacitive-mode protection
Burst-mode operation at light load
Input for brownout protection or power-on/off sequencing
“Safe-start” procedure prevents hard switching at startup
600 V rail compatible high-side gate driver with integrated bootstrap diode and high dv/dt immunity
-300/800 mA high-side and low-side gate drivers with UVLO pull-down
SO16N package

Resources








Alternative Descriptions

Resonant Cntrl, 600V, -0.3/0.8A, 16Soic | Newark Electronics
RESONANT CNTRL, 600V, -0.3/0.8A, 16SOIC | element14
IC: driver | Transfer Multisort Elektronik
STMicroelectronics, L6699D | RS
L6699 Series 16 V 4.1 mA Surface Mount Half-Bridge PWM Controller - SOIC-16N | Future Electronics
Enhanced High Voltage Resonant Controller 16-Pin SO Tube | Avnet America


Frequently Asked Questions

Where can I find additional details, specifications and documents for a L6699D?

Additional datasheets, footprints and schematics for L6699D are listed on our Part Details page. You can also find images and similar parts to L6699D on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for L6699D on our Product Comparison page. Access via the 'View Pricing & Stock' button to view L6699D price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does L6699D fall under?

The L6699D is listed under Power Management > AC-DC Converters > Digital and Resonant Controllers.

Can I view similar or alternative parts?

You can view similar parts to L6699D when available in the Digital and Resonant 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 L6699D you can contact the distributor directly for product support, shipping queries etc.

Is the L6699D RoHS compliant?

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

Which authorised distributors for L6699D have stock available?

Authorised distributors including Newark Electronics, element14, Farnell, Transfer Multisort Elektronik and RS have stock available or on a lead time for L6699D.

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