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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.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
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Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISA132V1 ST 300 W peak power (170 W continuous power) LLC resonant converter based on L6699, STB13N60M2 and STPS20M80CG 
STEVAL-ISA138V1 -- 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 
STEVAL-ISA170V1 ST 12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001 Part Number300 W peak power (170 W continuous power) LLC resonant converter based on L6699, STB13N60M2 and STPS20M80CG
19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699
12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L6699D |
Active
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SO-16 | Industrial | Ecopack2 | |
| L6699DTR |
Active
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SO-16 | Industrial | 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
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L6699D | 6 distributors | Buy now |
Active
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EAR99 | NEC | Tube | SO-16 | - | - | PHILIPPINES | 0.919 / 1k | |
| L6699DTR | 7 distributors | Sample & Buy Buy now |
Active
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EAR99 | NEC | Tape And Reel | SO-16 | - | - | PHILIPPINES | 0.919 / 1k | |
(*) 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
