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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TC7660SEOA723 데이터시트(PDF) 9 Page - Microchip Technology |
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TC7660SEOA723 데이터시트(HTML) 9 Page - Microchip Technology |
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9 / 24 page  2001-2015 Microchip Technology Inc. DS20001467C-page 9 TC7660S 5.0 APPLICATIONS INFORMATION 5.1 Simple Negative Voltage Converter Figure 5-1 shows typical connections to provide a negative supply where a positive supply is available. A similar scheme may be employed for supply voltages anywhere in the operating range of +1.5V to +12V, keeping in mind that pin 6 (LV) is tied to the supply negative (GND) only for supply voltages below 3.5V. FIGURE 5-1: Simple Negative Converter. The output characteristics of the circuit in Figure 5-1 are those of a nearly ideal voltage source in series with a 70 resistor. Thus, for a load current of -10 mA and a supply voltage of +5V, the output voltage would be -4.3V. The dynamic output impedance of the TC7660S is due, primarily, to capacitive reactance of the charge transfer capacitor (C1). Since this capacitor is connected to the output for only half of the cycle, the equation is: EQUATION 5.2 Paralleling Devices Any number of TC7660S voltage converters may be paralleled to reduce output resistance (Figure 5-2). The reservoir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resul- tant output resistance would be approximately: EQUATION FIGURE 5-2: Paralleling Devices Lowers Output Impedance. FIGURE 5-3: Increased Output Voltage By Cascading Devices. + V+ + 1 2 3 4 8 7 6 5 TC7660S VOUT* C1 10 µF * VOUT = -V + for 1.5V V+ 12V C2 10 µF X C 2 2fC 1 ----------- 3.18 == where: f = 10 kHz and C1 = 10 µF. R OUT R OUT of TC7660S n number of devices --------------------------------------------------- = “n” “1” RL + V+ + 1 2 3 4 8 7 6 5 TC7660S C1 C2 + 1 2 3 4 8 7 6 5 TC7660S C1 V OUT * “1” + V+ + 1 2 3 4 8 7 6 5 TC7660S 10 µF * VOUT = -n V+ for 1.5V V+ 12V “n” + 1 2 3 4 8 7 6 5 TC7660S 10 µF 10 µF + 10 µF |
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