ST STCMB1 19V 90W适配器解决方案

ST公司的STCMB1集成了瞬态模式(TM) PFC,用于LLC谐振半桥的高压双端控制器,额定电压800V高压部分和用于监视这三部分运作的无缝逻辑.PFC部分采用专用的恒定开态控制方案,它不需要正弦输入基准,因此降低了系统成本和外接元件数量.器件还包括完整的保护特性如逐个周期的过流保护(OCP),输出过压(OVP),反馈失效(FFP,锁定模式),AC降压, 升压电感饱和浪涌电流检测.半桥(HB)部分工作高达750 kHz,提供两个互补输出,以180°反相驱动高边和低边MOSFET,开关关闭和另一开关接通之间的死区插入是自动调整,保证了零电压开关和从轻到满负载时的更高效率.主要用在AC/DC适配器,开框开关电源,台式电脑和全合一PC的开关电源,消费类电子和工业开关电源,以及LED街区照明.本文介绍了STCMB1主要特性,框图和典型的系统框图, HB谐振控制器框图, 应用框图以及演示板EVLCMB1-90WADP主要特性,电路图和材料清单.

The STCMB1 device embodies a transition mode (TM) PFC, a high voltage double-ended

controller for LLC resonant half-bridge, an 800 V-rated high voltage section and the glue

logic that supervises the operation of these three blocks.

The PFC section uses a proprietary constant on-time control methodology that does not

require a sinusoidal input reference, thereby reducing the system cost and external

component count.

It includes also a complete set of protections: a cycle-by-cycle overcurrent (OCP), an output overvoltage (OVP), a feedback failure (FFP, latch-mode), an ac brown-out, boost inductor saturation and inrush current detection both at the start-up and after mains sags or missing cycles.

The half-bridge (HB) section provides two complementary outputs that drive the high-side

and low-side MOSFET 180° out-of-phase. The deadtime inserted between the turn-off of an either switch and the turn-on of the other is automatically adjusted to ensure zero voltage switching and higher efficiency from low to full load.

A proprietary contro...