Datenblatt-Suchmaschine für elektronische Bauteile |
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TC7660HEOA Datenblatt(PDF) 5 Page - Microchip Technology |
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TC7660HEOA Datenblatt(HTML) 5 Page - Microchip Technology |
5 / 8 page 5 HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H TC7660H-2 10/1/96 © 2001 Microchip Technology Inc. DS21466A Figure 5. Paralleling Devices Lowers Output Impedance 1 2 3 4 8 7 6 5 TC7660H V + 1 2 3 4 8 7 6 5 TC7660H C1 RL C2 C1 "n" "1" + RL 1 2 3 4 8 7 6 5 TC7660H + V + + CMOS GATE 1.0 µF VOUT 1.0 µF 1 k Ω V + Figure 6. External Clocking Figure 7. Positive Voltage Multiplier Positive Voltage Multiplication The TC7660H may be employed to achieve positive voltage multiplication using the circuit shown in Figure 7. In this application, the pump inverter switches of the TC7660H are used to charge C1 to a voltage level of V+ – VF (where V+ is the supply voltage and VF is the forward voltage drop of diode D1). On the transfer cycle, the voltage on C1 plus the supply voltage (V+) is applied through diode D2 to capacitor C2. The voltage thus created on C2 becomes (2 V+) – (2 VF), or twice the supply voltage minus the combined forward voltage drops of diodes D1 and D2. The source impedance of the output (VOUT) will depend on the output current, but for V+ = 5V and an output current of 10mA, it will be approximately 60 Ω. Combined Negative Voltage Conversion and Positive Supply Multiplication Figure 8 combines the functions shown in Figures 3 and 8 to provide negative voltage conversion and positive volt- age multiplication simultaneously. This approach would be, for example, suitable for generating +9V and –5V from an existing +5V supply. In this instance, capacitors C1 and C3 perform the pump and reservoir functions, respectively, for the generation of the negative voltage, while capacitors C2 and C4 are pump and reservoir, respectively, for the multi- plied positive voltage. There is a penalty in this configuration which combines both functions, however, 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. 1 2 3 4 8 7 6 5 + V + VOUT = (2 V +) – (2 VF) C1 D1 + + C3 C4 VOUT = – (V+– VF) C2 TC7660H D2 + Figure 8. Combined Negative Converter and Positive Multiplier 1 2 3 4 8 7 6 5 V+ VOUT = (2 V+) – (2 VF) + C2 D1 D2 + C1 TC7660H |
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