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LTC2974 数据表(PDF) 14 Page - Linear Technology |
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LTC2974 数据表(HTML) 14 Page - Linear Technology |
14 / 36 page LTM4644/LTM4644-1 14 4644fe For more information www.linear.com/LTM4644 APPLICATIONS INFORMATION 4644 F05 CH1 CSS 0.1µF RFB1 13.3k VIN 4V TO 14V RTR(TOP)2 60.4k CH2 RFB(SL)2 19.1k CH3 RFB(SL)3 30.1k CH4 RFB(SL)4 60.4k RTR(BOT)2 13.3k RTR(TOP)3 60.4k RTR(BOT)3 13.3k RTR(TOP)4 60.4k RTR(BOT)4 13.3k 60.4k 60.4k 60.4k 60.4k 4644 F04 TIME VOUT4 = 1.2V VOUT3 = 1.8V VOUT2 = 2.5V VOUT1 = 3.3V Figure 4. Output Ratiometric Tracking Waveform Figure 5. Output Ratiometric Tracking Schematic Forexample,VOUT(MA)=3.3V,MR=3.3V/24msandVOUT(SL) = 1.2V, SR = 1.2V/24ms as VOUT1 and VOUT4 shown in Figure 5. From the equation, we could solve out that RTR4(TOP) = 60.4k and RTR4(BOT) = 13.3k is a good com- bination. Follow the same equation, we can get the same RTR(TOP)/RTR(BOT) resistor divider value for VOUT2 and VOUT3. The TRACK pins will have the 2.5µA current source on when a resistive divider is used to implement tracking on that specific channel. This will impose an offset on the TRACK pin input. Smaller value resistors with the same ratios as the resistor values calculated from the above equation can be used. For example, where the 60.4k is used then a 6.04k can be used to reduce the TRACK pin offset to a negligible value. The coincident output tracking can be recognized as a special ratiometric output tracking which the master’s output slew rate (MR) is the same as the slave’s output slew rate (SR), as waveform shown in Figure 6. From the equation we could easily find out that, in the coincident tracking, the slave regulator’s TRACK/SS pin resistor divider is always the same as its output voltage divider. RFB(SL) RFB(SL) +60.4k = RTR(BOT) RTR(TOP) +RTR(BOT) |
类似零件编号 - LTC2974 |
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类似说明 - LTC2974 |
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