This is information on a product in full production. The document describes the features and characteristics of the L6591 PWM controller for ZVS half bridge. It includes programmable deadtime, operating frequency up to 500 kHz, onboard high-voltage startup, advanced light load management, adaptive UVLO, pulse-by-pulse OCP, OLP (latched or autorestart), transformer saturation detection, interface with PFC controller, latched disable input, power-on sequencing or brownout protection input, programmable soft-start, 4% precision external reference, 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity, and SO16N package. The product is suitable for high power AC-DC adapter/charger, desktop PC, entry-level server, telecom SMPS.
The L6591 is a double-ended PWM controller specific to the soft-switched half bridge topology. It provides complementary PWM control with an externally programmable deadtime to guarantee soft-switching and enable high-frequency operation up to 500 kHz. 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 device includes advanced features such as onboard high-voltage startup, adaptive UVLO, and light load management via burst mode operation. Protection functions include pulse-by-pulse overcurrent protection (OCP), latched or autorestart OLP, transformer saturation detection, and a latched disable input. It also offers an interface with PFC controllers to allow the pre-regulator to be switched off between bursts for energy saving compliance.
| Operating frequency | Up to 500 kHz |
|---|---|
| High-side gate driver voltage | 600 V-rail compatible |
| Package type | SO16N |
| Voltage reference precision | 4% |
| Maximum duty cycle | 50% |
The L6591 supports an operating frequency of up to 500 kHz.
No, it uses a synchronous-driven high-voltage DMOS to replace the external fast-recovery bootstrap diode.
The IC shuts down when the voltage on the DIS pin exceeds 4.5 V.