STMicroelectronics L6591
The L6591 is a double-ended PWM controller specific to the soft-switched half bridge topology. It provides complementary PWM control, where the high-side switch is driven ON for a duty cycle D and the low-side switch for a duty cycle 1-D, with D < 50%. The IC enables the user to set the operating frequency of the converter by means of an externally programmable oscillator: the maximum duty cycle is digitally clipped at 50% by a T-flip-flop, so that the operating frequency is half that of the oscillator.| Part No. | L6591 |
|---|---|
| Datasheet | L6591 Download |
| Manufacturer |  STMicroelectronics |
| Description | PWM controller |
| Buy | Stock & Price |
FEATURES
● Complementary PWM control for soft-switched half bridge with programmable deadtime● Up to 500 kHz operating frequency
● 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
● Input for power-on sequencing or brownout protection
● Programmable soft-start Figure 1. Block diagram SO16 narrow
● 4% precision exterSnOal r1e6ference
● 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity
● SO16N package
APPLICATIONS
● High power AC-DC adapter/charger● Desktop PC, entry-level server
● Telecom SMPS 5 OSC TIMING HV 16 CLK V CC 9 25 V HV ge nerator ON/O FFa nd a daptive UV LOmanag ement Vre f VREG 2 DIS + 4.5V - R SQ 1.5V ISEN 3 PFC_STOP 8 1 LINE 1 5µA HICCUP + BLANKI NG OCP2 DI S 1.25V - R Q S Ilimre f 0 .8 V max. LI NE_OK + PWM - OCP2 + OCP - + SOFT-START 4 Low UVLO Vcc_O...
