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TC660COA Datasheet(PDF) 8 Page - TelCom Semiconductor, Inc |
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TC660COA Datasheet(HTML) 8 Page - TelCom Semiconductor, Inc |
8 / 8 page 4-12 TELCOM SEMICONDUCTOR, INC. TC660 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER Figure 8. Positive Voltage Doubler Figure 9. Improved Voltage Doubler 1 2 3 4 8 7 6 5 R = 0.1 – 1M Ω C1 200 R D VOUT = 2 VIN VIN C2 TC660 Figure 10. Combined Negative Converter and Positive Multiplier Figure 9 shows an improved way of using the TC660 as a voltage doubler. In this circuit, C1 is first charged to VIN and C2 is quickly brought to within a diode drop of VIN (to prevent substrate reversal) through D. The optional 200 Ω resistor is only to limit the brief latchup current. On the next half-cycle, VIN is in series with C1; C2 is then charged to 2 VIN. D is now reverse-biased and plays no further part. For VIN < 3V, R may be necessary to ensure startup. Combined Negative Voltage Conversion and Positive Supply Multiplication Figure 10 combines the functions shown in Figures 3 and 8 to provide negative voltage conversion and positive voltage multiplication simultaneously. In this instance, ca- pacitors C1 and C3 perform the pump and reservoir func- tions, respectively, for the generation of the negative volt- age, while capacitors C2 and C4 are pump and reservoir, respectively, for the multiplied positive voltage. There is a penalty in this configuration in that the source impedances of the generated supplies will be somewhat higher due to the finite impedance of the common charge pump driver at pin 2 of the device. Figure 11. Positive Voltage Multiplier 1 2 3 4 8 7 6 5 + V + VOUT = (2 V +) – (2 VF) C1 D1 + + C3 C4 VOUT = –V + C2 TC660 D2 + 1 2 3 4 8 7 6 5 V+ VOUT = (2 V+) – (2 VF) + C2 D1 D2 + C1 TC660 Efficient Positive Voltage Multiplication/Conversion Since the switches that allow the charge pumping op- eration are bidirectional, the charge transfer can be per- formed backward as easily as forward. Figure 11 shows a TC660 transforming –5V to +5V. The only problem here is that the internal clock and switch-drive section will not operate until some positive voltage has been generated. A diode and resistor shown dotted in Figure 11 can be used to "force" the internal regulator on. 1 2 3 4 8 7 6 5 + VOUT = –V – 150 µF + 1 M Ω V– INPUT C1 150 µF TC660 |
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