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MC33063A-Q1 bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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MC33063A-Q1 bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 26 page V – Current-Limit Sense Voltage – V CLS 0 0.2 0.4 0.6 0.8 1 0.03 0.1 0.3 1 3 10 30 V = 5 V CC T = 25°C A V = 40 V CC I = I chg dischg Comparator Inverting Input Output R2 R1 V = 1.25(R2/R1 + 1) out MC33063A-Q1 SLLS654C – APRIL 2005 – REVISED DECEMBER 2014 www.ti.com Feature Description (continued) Figure 6. Reference Voltage Circuit 7.3.2 Current Limit Current limit is accomplished by monitoring the voltage drop across an external sense resistor located in series with VCC and the output switch. The voltage drop developed across the sense resistor is monitored by the current-sense pin, Ipk. When the voltage drop across the sense resistor becomes greater than the preset value of 330 mV, the current-limit circuitry provides an additional current path to charge the timing capacitor (CT) rapidly, to reach the upper oscillator threshold and, thus, limiting the amount of energy stored in the inductor. The minimum sense resistor is 0.2 W. Figure 7 shows the timing capacitor charge current versus current-limit sense voltage. To set the peak current, Ipk = 330 mV/Rsense. Figure 7. Timing Capacitor Charge Current vs Current-Limit Sense Voltage 7.3.3 Current Limit of Typical Operation Waveforms The output switch is an NPN Darlington transistor. The collector of the output transistor is tied to pin 1, and the emitter is tied to pin 2. This allows the designer to use the MC33063 device in buck, boost, or inverter configurations. The maximum collector-emitter saturation voltage at 1.5 A (peak) is 1.3 V, and the maximum peak current of the output switch is 1.5 A. For higher peak output current, an external transistor can be used. Figure 8 shows the typical operation waveforms. 8 Submit Documentation Feedback Copyright © 2005–2014, Texas Instruments Incorporated Product Folder Links: MC33063A-Q1 |
Số phần tương tự - MC33063A-Q1_15 |
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Mô tả tương tự - MC33063A-Q1_15 |
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