HVLED805TR

IS32LT3175N/P Single-Channel Linear LED Drivers

ISSI IS32LT3175N/P Single-Channel Linear LED Drivers come with fade in/out and PWM dimming. The regulators serve as a stand-alone LED driver-configurable from 20mA to 150mA with external resistors, no microcontroller is necessary. A logic level “courtesy light” signal from the PWM pin can be interfaced to precisely drive the LED channel. The IS32LT3175P obtains a positive polarity PWM signal. In addition, the IS32LT3175N obtains a negative polarity PWM signal. The regulator integrates a 63-step fade-in and fades out the algorithm (Gamma correction). This causes the output LED current to increasingly rise up to the full source value after the EN pin is pulsed.

HVLED805离线LED驱动器

STMicroelectronics HVLED805离线LED驱动器是一套高效、紧凑、高性价比的LED驱动解决方案。HVLED805是一款高电压主开关，直接由整流市电供电运行，采用最少的外部元件。该驱动器在同一个封装内整合了一个高性能低压PWM控制器芯片和一个800V雪崩耐用功率MOSFET。

STMicroelectronics Off-line LED Driver with Primary-Sensing

STMicroelectronics Off-line LED Driver with Primary-Sensing is a high-voltage primary switcher intended for operating directly from the rectified mains with minimum external parts to provide an efficient, compact, and cost effective solution for LED driving. STMicroelectronics Off-line LED Driver with Primary-Sensing combines a high-performance low-voltage PWM controller chip and an 800V, avalanche-rugged power MOSFET in the same package. The PWM is a current-mode controller IC specifically designed for ZVS (zero voltage switching) fly-back LED drivers, with constant output current (CC) regulation using primary-sensing feedback. This eliminates the need for the opto-coupler, the secondary voltage reference, as well as the current sense on the secondary side, while still maintaining a good LED current accuracy. Moreover it guarantees a safe operation when a short circuit of one or more LEDs occurs. In addition, the device can also provide a constant output voltage regulation (CV), which makes the application able to work safely when the LED string opens due to a failure. Quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers the MOSFET's turn-on. This input also serves as both output voltage monitor to perform CV regulation, and input voltage monitor to achieve mains-independent CC regulation.