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
| 订购型号 | 产品状态 | 美金价格 | 数量 | 封装 | 包装形式 | 温度范围 | 材料声明 |
| L6699DTR | Active | 1000 | SO-16 | Tape And Reel | |||
| L6699D | Active | 1000 | SO-16 | Tube |
| 描述 | 版本 | 大小 |
| L6699 : DS8908: Enhanced high-voltage resonant controller | 1 | 1968KB |
| 描述 | 版本 | 大小 |
| AN4026: 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 | 1 | 989KB |
| AN4027: 12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000 | 1 | 2337KB |
| 描述 | 版本 | 大小 |
| Smart street lighting solutions | 1.0.0 | 1597KB |
| Energy-efficient solutions for offline LED lighting and general illumination | 2.0.0 | 2646KB |
| 型号 | 描述 |
| EVL6699-90WADP | 19V - 90W Adapter with PFC for Laptop computers using the L6563H and L6699 |
| EVL6699-150W-SR | 12V - 150W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000 |
| 描述 | 版本 | 大小 |
| FLATX0511 : High-efficiency ATX design using asymmetrical half-bridge topology | 1.0.0 | 1148KB |
