Triconex 3503E工業(yè)備件
輸入電壓或輸出負(fù)載條件下
首先，它對(duì)輸入電壓變化有即時(shí)響應(yīng)，不像電壓模式開(kāi)關(guān)那樣，它的線路瞬態(tài)響應(yīng)非常差。其次，它減少了儲(chǔ)能電感器中頻的90°相移。這大大簡(jiǎn)化了在廣泛變化的輸入電壓或輸出負(fù)載條件下的閉環(huán)頻率補(bǔ)償。最后，它允許簡(jiǎn)單的逐脈沖電流限制，以在輸出過(guò)載或短路條件下提供最大的開(kāi)關(guān)保護(hù)。低壓差內(nèi)部穩(wěn)壓器為所有內(nèi)部電路提供2.3V電源。這種低壓降設(shè)計(jì)允許輸入電壓從2.7V變化到25V，而器件性能幾乎沒(méi)有變化。500kHz振蕩器是所有內(nèi)部定時(shí)的基本時(shí)鐘。它通過(guò)邏輯和驅(qū)動(dòng)器電路打開(kāi)輸出開(kāi)關(guān)。特殊的自適應(yīng)反飽和電路檢測(cè)電源開(kāi)關(guān)中的飽和開(kāi)始，并瞬時(shí)調(diào)整驅(qū)動(dòng)器電流以限制開(kāi)關(guān)飽和。這最小化了驅(qū)動(dòng)器耗散，并提供了開(kāi)關(guān)的快速關(guān)閉。1.245V帶隙基準(zhǔn)偏置誤差放大器的正輸入。
正輸出電壓感測(cè)
放大器的負(fù)輸入端用于正輸出電壓感測(cè)。誤差放大器具有非線性跨導(dǎo)，以減少啟動(dòng)或過(guò)載恢復(fù)時(shí)的輸出過(guò)沖。當(dāng)反饋電壓超過(guò)參考電壓40mV時(shí)，誤差放大器跨導(dǎo)增加10倍，這減少了輸出過(guò)沖。反饋輸入還調(diào)用振蕩器頻移，這有助于在過(guò)載條件下保護(hù)部件。當(dāng)反饋電壓降至0.6V以下時(shí)，振蕩器頻率降低5:1。降低開(kāi)關(guān)頻率可通過(guò)降低最小開(kāi)關(guān)占空比來(lái)完全控制開(kāi)關(guān)電流限制。–+NFBA NFB S/S FB 100k 50k 0.005? – + EA VC VIN GND SENSE GND LT1370?BD 1.245V REF 5:1頻移同步OSC關(guān)閉延遲和復(fù)位低電壓降2.3V REG防衛(wèi)星邏輯驅(qū)動(dòng)器SW開(kāi)關(guān)–+IA AV≈ 20 COMP 7 LT1370 sn1370 1370fs獨(dú)特的誤差放大器電路允許LT1370直接調(diào)節(jié)負(fù)輸出電壓。負(fù)反饋放大器的100k源電阻用于負(fù)輸出電壓檢測(cè)。
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 ? –+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.
