SN6507-Q1数据手册TI中文资料规格书

描述 Description

SN6507 -Q1 是一款高压、高频推挽式变压器驱动器，以小尺寸解决方案提供隔离电源。该器件具有推挽式拓扑结构的简单性、低 EMI 和磁通消除等优点，可防止变压器饱和。采用占空比控制技术来减少宽输入范围的元件数量，同时选择高开关频率来缩小变压器尺寸，从而进一步节省空间。

该器件集成了控制器和两个异相切换的 0.5A NMOS 电源开关。其输入工作范围通过精密欠压锁定进行编程。该器件通过过流保护 (OCP)、可调节欠压锁定 (UVLO)、过压锁定 (OVLO)、热关断 (TSD) 和先断后通型电路来防止出现故障条件。

可编程软启动 (SS) 可尽可能减少浪涌电流，并为满足关键的上电要求提供电源时序。展频时钟 (SSC) 和引脚可配置的压摆率控制 (SRC) 进一步降低了辐射和传导发射，以满足超低 EMI 要求。

SN6507 -Q1 可采用 10 引脚 HVSSOP DGQ 封装。该器件的运行温度范围为 –55°C 至 125°C。

特性 Features

SN6507-Q1 has an internal oscillator to set the switching frequency of the power stage. As the two power switches are out of phase, the oscillator frequency is twice of the actual switching frequency of each power switch. The duty cycle is fixed with 70 ns deadtime to avoid shoot-through. The duty cycle is changeable if duty cycle feature is enabled. Please refer to Section 8.3.3. SN6507-Q1 has a wide switching frequency range from 100 kHz up to 2 MHz, which is pin-programmable through a resistor (RCLK) to GND. Below table lists the value of RCLK to achieve certain operating frequencies (fSW). The choice of switching frequency is a trade-off between power efficiency and size of capacitive and inductive components. For example, when operating at higher switching frequency, the size of the transformer and inductor is reduced, resulting in a smaller design footprint and lower cost. However, higher frequency increases switching losses and consequently degrades the overall power supply efficiency. Figure 8-6 can also be used to estimate the programmable switching frequency, fSW, using an external resistor value, RCLK, where RCLK is in kΩ and fSW is in kHz: If CLK pin is shorted to GND, the part switches at its default frequency, FSW. CLK pin floating is not a valid state of operation and will cause the part to stop switching until an external clock signal is present.