IC698CRE020工控模塊前置控制器
典型性能特性
4 LT1370 sn1370 1370fs典型性能特性W U開(kāi)關(guān)頻率與反饋引腳電壓（V）–1輸入電流（μA）1 7 LT1370?G07–1–3 0 2–2–4 0 1 2 3 4 5 6反饋引腳電壓占空比（%）6.6開(kāi)關(guān)電流限制（A）7.4 7.2 7.8 8.2 7.0 6.8 8.0 20 40 60 80 LT1370?G02 0 10 30 50 70 90 100開(kāi)關(guān)電流限制與占空比開(kāi)關(guān)電流（A）0開(kāi)關(guān)電壓（mV）300 400 550 5 LT1370·G01 200 100 250 350 500 50 0 1 2 3 4 6 125°C 75°C 25°C 0°C溫度（°C）–50 1.8輸入電壓（V）2.0 2.2 2.6 0 50 100 150 LT1370？G03 2.8 3.0–2525 75 125最小輸入電壓vs溫度溫度（°C）–50 0關(guān)機(jī)延遲（μs）關(guān)機(jī)閾值（V）2 6 8 10 20 14 0 50 75 LT1370?G04 4 16 18 12 0 0.2 0.6 0.8 1.0 2.0 0.4 1.6 1.8 1.2–25 100 125 150關(guān)機(jī)閾值關(guān)機(jī)延遲和閾值vs溫度誤差放大器輸出電流vs反饋引腳電壓反饋引腳電壓（V）400誤差放大器輸出電流
VC高箝壓VC閾值引腳功能U UU VC：補(bǔ)償引腳用于頻率補(bǔ)償、電流限制和軟啟動(dòng)。它是誤差放大器的輸出和電流比較器的輸入。環(huán)路頻率補(bǔ)償可以通過(guò)從VC引腳接地的RC網(wǎng)絡(luò)來(lái)執(zhí)行。請(qǐng)參閱應(yīng)用程序信息。FB：反饋引腳用于正輸出電壓感測(cè)和振蕩器頻率偏移。它是誤差放大器的反相輸入。該放大器的非反相輸入端內(nèi)部連接到1.245V參考電壓。NFB：負(fù)反饋引腳用于負(fù)輸出電壓感測(cè)。它通過(guò)100k源電阻器連接到負(fù)反饋放大器的反相輸入端。S/S：停機(jī)和同步引腳。S/S引腳與邏輯電平兼容。關(guān)機(jī)處于低電平，關(guān)機(jī)閾值通常為1.3V。對(duì)于正常操作
Typical performance characteristics
4 LT1370 sn1370 1370fs Typical performance characteristics W U Switch frequency and feedback pin voltage (V) – 1 Input current (μ A) 1 7 LT1370 ? G07 – 1 – 3 0 2 – 2 – 4 0 1 2 3 5 6 Feedback pin voltage duty cycle (%) 6.6 Switch current limit (A) 7.4 7.2 7.8 8.2 7.0 6.8 8.0 20 60 LT1370 ? G02 0 30 50 70 100 Switch current limit and duty cycle Switch current (A) 0 Switch voltage (mV) 300 400 550 5 LT1370 · G01 200 100 250 350 500 50 0 1 2 3 4 6 125 ° C 75 ° C 25 ° C 0 ° C Temperature (° C) – 50 1.8 Input voltage (V) 2.0 2.2 0 50 100 150 LT1370? G03 2.8 3.0 – 2525 75 125 Minimum input voltage vs temperature (° C) – 50 0 Shutdown delay (μ s) Shutdown threshold (V) 2 6 8 10 20 14 0 50 75 LT1370 ? G04 4 16 18 12 0 0.2 0.6 0.8 1.0 2.0 0.4 1.6 1.2 – 25 100 125 150 Shutdown threshold Shutdown delay and threshold vs temperature error amplifier output current vs feedback pin voltage Feedback pin voltage (V) 400 Error amplifier output current
VC high clamp VC threshold pin function U UU VC: compensation pin is used for frequency compensation, current limitation and soft start. It is the output of the error amplifier and the input of the current comparator. Loop frequency compensation can be performed by an RC network grounded from the VC pin. See application information. FB: feedback pin is used for positive output voltage sensing and oscillator frequency offset. It is the inverse input of the error amplifier. The non inverting input of the amplifier is internally connected to a 1.245V reference voltage. NFB: negative feedback pin is used for negative output voltage sensing. It is connected to the inverting input of the negative feedback amplifier through a 100k source resistor. S/S: Shutdown and synchronization pin. The S/S pin is compatible with the logic level. The shutdown is at low level, and the shutdown threshold is usually 1.3V. For normal operation
