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TC7660EOA713 Scheda tecnica(PDF) 9 Page - Microchip Technology |
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TC7660EOA713 Scheda tecnica(HTML) 9 Page - Microchip Technology |
9 / 20 page 2002-2011 Microchip Technology Inc. DS21465C-page 9 TC7660 FIGURE 5-7: Combined Negative Converter and Positive Multiplier. 5.7 Efficient Positive Voltage Multiplication/Conversion Since the switches that allow the charge pumping operation are bidirectional, the charge transfer can be performed backwards as easily as forwards. Figure 5-8 shows a TC7660 transforming -5V to +5V (or +5V to +10V, etc.). The only problem here is that the internal clock and switch-drive section will not operate until some positive voltage has been generated. An ini- tial inefficient pump, as shown in Figure 5-7, could be used to start this circuit up, after which it will bypass the other (D1 and D2 in Figure 5-7 would never turn on), or else the diode and resistor shown dotted in Figure 5-8 can be used to “force” the internal regulator on. FIGURE 5-8: Positive Voltage Conversion. + C1 D1 + + C3 C4 C2 D2 + VOUT = 1 2 3 4 8 7 6 5 TC7660 V+ (2 V+) - (2 VF) VOUT = -V+ VOUT = -V- + 1M V- input + 1 2 3 4 8 7 6 5 TC7660 10 µF 10 µF C1 |
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