Triconex 3503E工业备件
输入电压或输出负载条件下
首先，它对输入电压变化有即时响应，不像电压模式开关那样，它的线路瞬态响应非常差。其次，它减少了储能电感器中频的90°相移。这大大简化了在广泛变化的输入电压或输出负载条件下的闭环频率补偿。最后，它允许简单的逐脉冲电流限制，以在输出过载或短路条件下提供最大的开关保护。低压差内部稳压器为所有内部电路提供2.3V电源。这种低压降设计允许输入电压从2.7V变化到25V，而器件性能几乎没有变化。500kHz振荡器是所有内部定时的基本时钟。它通过逻辑和驱动器电路打开输出开关。特殊的自适应反饱和电路检测电源开关中的饱和开始，并瞬时调整驱动器电流以限制开关饱和。这最小化了驱动器耗散，并提供了开关的快速关闭。1.245V带隙基准偏置误差放大器的正输入。
正输出电压感测
放大器的负输入端用于正输出电压感测。误差放大器具有非线性跨导，以减少启动或过载恢复时的输出过冲。当反馈电压超过参考电压40mV时，误差放大器跨导增加10倍，这减少了输出过冲。反馈输入还调用振荡器频移，这有助于在过载条件下保护部件。当反馈电压降至0.6V以下时，振荡器频率降低5:1。降低开关频率可通过降低最小开关占空比来完全控制开关电流限制。–+NFBA NFB S/S FB 100k 50k 0.005Ω – + EA VC VIN GND SENSE GND LT1370•BD 1.245V REF 5:1频移同步OSC关闭延迟和复位低电压降2.3V REG防卫星逻辑驱动器SW开关–+IA AV≈ 20 COMP 7 LT1370 sn1370 1370fs独特的误差放大器电路允许LT1370直接调节负输出电压。负反馈放大器的100k源电阻用于负输出电压检测。
Under input voltage or output load conditions
First of all, it has an immediate response to input voltage changes, unlike the voltage mode switch, its line transient response is very poor. Secondly, it reduces the 90 ° phase shift of the intermediate frequency of the energy storage inductor. This greatly simplifies closed-loop frequency compensation under widely varying input voltage or output load conditions. Finally, it allows simple pulse by pulse current limiting to provide maximum switching protection under output overload or short circuit conditions. The low dropout internal regulator provides 2.3V power for all internal circuits. This low drop design allows the input voltage to change from 2.7V to 25V, while the device performance has little change. The 500kHz oscillator is the basic clock for all internal timing. It turns on the output switch through logic and driver circuits. A special adaptive anti saturation circuit detects the start of saturation in the power switch, and adjusts the driver current instantaneously to limit the switch saturation. This minimizes drive dissipation and provides fast switching off. Positive input of 1.245V bandgap reference bias error amplifier.
Positive output voltage sensing
The negative input of the amplifier is used for positive output voltage sensing. The error amplifier has nonlinear transconductance to reduce the output overshoot during startup or overload recovery. When the feedback voltage exceeds the reference voltage by 40mV, the transconductance of the error amplifier increases by 10 times, which reduces the output overshoot. The feedback input also invokes the oscillator frequency shift, which helps protect the component under overload conditions. When the feedback voltage drops below 0.6V, the oscillator frequency decreases by 5:1. Lowering the switching frequency fully controls the switching current limit by reducing the minimum switching duty cycle. –+ NFBA NFB S/S FB 100k 50k 0.005 Ω –+EA VC VIN GND SENSE GND LT1370 • BD 1.245V REF 5:1 Frequency shift synchronous OSC closing delay and reset low voltage drop 2.3V REG anti satellite logic driver SW switch –+IA AV ≈ 20 COMP 7 LT1370 sn1370 1370fs The unique error amplifier circuit allows LT1370 to directly adjust the negative output voltage. The 100k source resistor of the negative feedback amplifier is used for negative output voltage detection.
