 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
TC7660SCOA 数据表(PDF) 9 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
TC7660SCOA 数据表(HTML) 9 Page - Microchip Technology |
|
|
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 |
|
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
