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L6591 데이터시트(PDF) 3 Page - STMicroelectronics |
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L6591 데이터시트(HTML) 3 Page - STMicroelectronics |
3 / 32 page L6591 Device description 3/32 1 Device description The L6591 is a double-ended PWM controller specific for 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 %. An externally programmable dead-time inserted between the turn-off of one switch and the turn-on of the other one guarantees soft-switching and enables high-frequency operation. 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 designer 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 will be half that of the oscillator. At very light load the IC enters a controlled burst-mode operation that, along with the built-in non-dissipative high-voltage start-up circuit and the low quiescent current, helps keep low the consumption from the mains and be compliant with energy saving recommendations. To allow compliance with these standards in two-stage power-factor-corrected systems as well, an interface with the PFC controller is provided that enables to switch off the pre- regulator between one burst and the following one. An innovative adaptive UVLO helps minimize the issues related to the fluctuations of the self-supply voltage with the output load, due to transformer's parasitic. IC's protection functions include: not-latched input undervoltage (brownout), a first-level OCP with delayed shutdown able to protect the system during overload and short circuit conditions (either auto-restart or latch mode can be selected) and a second-level OCP that latches off the IC when the transformer saturates or one of the secondary diodes fails short. Finally, a latched disable function allows easy implementation of OTP or OVP. Programmable soft-start and digital leading-edge blanking on current sense input pin complete the equipment of the IC. Figure 2. Typical system block diagram Vinac Voutd c L6561/2 or L6563 PW M is turned off in case of PFC's anomalous oper ation, for safety PFC can be turned off at light load to ease compliance with energy saving r egulatio ns. L6591 PFC PRE-REGULATOR ZVS HALF-BRIDGE Vinac Voutd c L6561/2 or L6563 PW M is turned off in case of PFC's anomalous oper ation, for safety PFC can be turned off at light load to ease compliance with energy saving r egulatio ns. L6591 PFC PRE-REGULATOR ZVS HALF-BRIDGE |
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