参数资料
| 型号： | CAT660EVA-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL INV 8SOI |
| 标准包装： | 3,000 |
| 类型： | 切换式电容器（充电泵），倍增器，反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输入电压： | 1.5 V ~ 5.5 V |
| 频率 - 开关： | 10kHz，80kHz |
| 电流 - 输出： | 100mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 包装： | * |
| 供应商设备封装： | * |
CAT660
Application Information
Circuit Description and Operating Theory
+ V1 * V2
I +
The CAT660 switches capacitors to invert or double an
input voltage.
Figure 13 shows a simple switch capacitor circuit. In
position 1 capacitor C1 is charged to voltage V1. The total
charge on C1 is Q1 = C1V1. When the switch moves to
position 2, the input capacitor C1 is discharged to voltage
V2. After discharge, the charge on C1 is Q2 = C1V2.
The charge transferred is:
D Q + Q1 * Q2 + C1 (V1 * V2)
If the switch is cycled “F” times per second, the current
(charge transfer per unit time) is:
I + F D Q + F C1 (V1 * V2)
Rearranging in terms of impedance:
(V1 * V2)
(1 FC1) REQ
The 1/FC1 term can be modeled as an equivalent
impedance REQ. A simple equivalent circuit is shown in
Figure 14. This circuit does not include the switch resistance
nor does it include output voltage ripple. It does allow one
to understand the switch ? capacitor topology and make
prudent engineering tradeoffs.
For example, power conversion efficiency is set by the
output impedance, which consists of REQ and switch
resistance. As switching frequency is decreased, REQ, the
1/FC1 term, will dominate the output impedance, causing
higher voltage losses and decreased efficiency. As the
frequency is increased quiescent current increases. At high
frequency this current becomes significant and the power
efficiency degrades.
The oscillator is designed to operate where voltage losses
are a minimum. With external 150 m F capacitors, the internal
switch resistances and the Equivalent Series Resistance
(ESR) of the external capacitors determine the effective
output impedance.
A block diagram of the CAT660 is shown in Figure 15.
The CAT660 is a replacement for the MAX660 and the
LTC660.
REQ
V1
V2
V1
V2
C1
C2
R L
C2
R L
REQ + 1
FC1
Figure 13. Switched ? Capacitor Building Block
Figure 14. Switched ? Capacitor Equivalent Circuit
http://onsemi.com
6
相关PDF资料 |
PDF描述 |
|---|---|
| CAT661EVA-GT3 | IC REG SWITCHED CAP DBL INV 8SOI |
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| CAT706TZI-GT3 | IC SUPERVISOR 3.08V 8MSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT660EVA-T3 | 功能描述:电荷泵 Charge pump voltage converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| CAT660EVA-TE13 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:100mA CMOS Charge Pump Inverter/Doubler |
| CAT660EZD8 | 功能描述:电荷泵 Ind Temp 100mA Out RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| CAT660EZD8-T2 | 制造商:ON Semiconductor 功能描述:CHARGE PUMP VOLTAGE CONVERTER - Tape and Reel |
| CAT661 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:High Frequency 100mA CMOS Charge Pump, Inverter/Doubler |
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