L6699:Enhanced high-voltage resonant controller

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.

Key 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
Product Specifications
DescriptionVersionSize
DS8908: Enhanced high voltage resonant controller2.0954 KB
Application Notes
DescriptionVersionSize
AN4677: 12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK20011.03 MB
AN4027: 12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000A3.02 MB
AN4026: 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L66991.2988 KB
AN4720: Half bridge resonant LLC converters and primary side MOSFET selection1.01 MB
AN4599: STEVAL-ISA132V1 24 V 300 W peak power resonant converter3.0904 KB
Design Notes & Tips
DescriptionVersionSize
DT0009: Speed up development of the L6699 with the L6599A and flexible PCB layout1.1262 KB
HW Model & CAD Libraries
DescriptionVersionSize
L6699 ORCAD macromodel1.094 KB
L6699 SIMPLIS MAROTTA encrypted1.0194 KB
Presentations
DescriptionVersionSize
EuP Lot 6 Tier2 Ecodesign requirements for Standby2 MB
L6699: Enhanced high-voltage resonant controller1.0331 KB
Primary side regulation controllers portfolio1 MB
Brochures
DescriptionVersionSize
Brochure Power management guide05.20164 MB
Solution Evaluation Tools
Part NumberManufacturerDescription
EVL400W-ADP/ATX12V - 400W SMPS for Adapter, Desktop and AIO using L4984D, L6699 and SRK2000A
STEVAL-ISA132V1ST300 W peak power (170 W continuous power) LLC resonant converter based on L6699, STB13N60M2 and STPS20M80CG
STEVAL-ISA138V119 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699
STEVAL-ISA170V1ST12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001
Sample & Buy
Part NumberPackagePacking TypeUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
L6699DSO-16Tube1.4751000NECEAR99CHINA
L6699DTRSO-16Tape And Reel1.4751000NECEAR99CHINA
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
L6699DSO-16IndustrialEcopack2md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_d5q7-wspc-u340bc6-wspc-.pdf
md_q7-wspc-so-wspc-16-wspc-.xml
L6699DTRSO-16IndustrialEcopack2md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_d5q7-wspc-u340bc6-wspc-.pdf
md_q7-wspc-so-wspc-16-wspc-.xml
Enhanced high voltage resonant controller L6699
12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001 STEVAL-ISA170V1
12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000A L6699
19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 L6699
Half bridge resonant LLC converters and primary side MOSFET selection L6699
STEVAL-ISA132V1 24 V 300 W peak power resonant converter STEVAL-ISA132V1
Speed up development of the L6699 with the L6599A and flexible PCB layout L6699
Speed up development of the L6699 with the L6599A and flexible PCB layout L6699
Speed up development of the L6699 with the L6599A and flexible PCB layout L6699
12 V – 400 W SMPS for adapter, desktop and AIO using L4984D, L6699 and SRK2000A EVL400W-ADP-ATX
Speed up development of the L6699 with the L6599A and flexible PCB layout L6699
48 V - 130 W high efficiency converter with PFC for LED street lighting applications - European version L6599AT
Very low drop voltage regulators with inhibit KFXX
md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_d5q7-wspc-u340bc6-wspc-.pdf L6699
md_q7-wspc-so-wspc-16-wspc-.xml HCF4060