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| 型号： | TC7660EOA713 |
| 厂商： | Microchip Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP INV ADJ 8SOIC |
| 标准包装： | 3,300 |
| 类型： | 切换式电容器（充电泵），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -1.5 V ~ -10 V |
| 输入电压： | 1.5 V ~ 10 V |
| 频率 - 开关： | 10kHz |
| 电流 - 输出： | 20mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOICN |
TC7660
R OUT = ----------------------------- + 8 R SW + 4 ESR C 1 + ESR C 2
4.0
4.1
DETAILED DESCRIPTION
Theory of Operation
EQUATION
1
f PUMP ? C 1
f PUMP = -----------
The TC7660 charge pump converter inverts the voltage
applied to the V + pin. The conversion consists of a two-
phase operation ( Figure 4-1 ). During the first phase,
switches S 2 and S 4 are open and switches S 1 and S 3
are closed. C 1 charges to the voltage applied to the V +
pin, with the load current being supplied from C 2 . Dur-
ing the second phase, switches S 2 and S 4 are closed
and switches S 1 and S 3 are open. Charge is trans-
ferred from C 1 to C 2 , with the load current being
supplied from C 1 .
Where:
f OSC
2
R SW = on-resistance of the switches
ESR C 1 = equivalent series resistance of C 1
ESR C 2 = equivalent series resistance of C 2
4.2 Switched Capacitor Inverter
V +
S 1
+
S 2
C 1
Power Losses
The overall power loss of a switched capacitor inverter
is affected by four factors:
1. Losses from power consumed by the internal
GND
S 3
S 4
C 2
+
V OUT = -V IN
2.
oscillator, switch drive, etc. These losses will
vary with input voltage, temperature and
oscillator frequency.
Conduction losses in the non-ideal switches.
3.
4.
Losses due to the non-ideal nature of the
external capacitors.
Losses that occur during charge transfer from
FIGURE 4-1:
Inverter.
Ideal Switched Capacitor
C 1 to C 2 when a voltage difference between the
capacitors exists.
with the switched capacitor inverter power loss.
In this manner, the TC7660 performs a voltage inver-
sion, but does not provide regulation. The average out-
put voltage will drop in a linear manner with respect to
load current. The equivalent circuit of the charge pump
R SW
S 1
R SW
S 2
inverter can be modeled as an ideal voltage source in
R OUT
V +
+
-
I DD
+
C 1
ESR C1
+
C 2
ESR C2
I OUT LOAD
-
V OUT
R SW
S 3
R SW
S 4
V +
+
FIGURE 4-3:
Non-Ideal Switched
FIGURE 4-2: Switched Capacitor Inverter
Equivalent Circuit Model.
Capacitor Inverter.
The power loss is calculated using the following
equation:
P LOSS = I OUT ? R OUT + I DD ? V
The value of the series resistor (R OUT ) is a function of
the switching frequency, capacitance and equivalent
series resistance (ESR) of C 1 and C 2 and the on-resis-
tance of switches S 1 , S 2 , S 3 and S 4 . A close
approximation for R OUT is given in the following
equation:
EQUATION
2
+
DS21465C-page 6
? 2002-2011 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7660EOATR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:+5V To 【10V Voltage Converter |
| TC7660EPA | 功能描述:电荷泵 DC-DC 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 |
| TC7660EV | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC7660H | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER |
| TC7660HCOA | 功能描述:电荷泵 High Frequency 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 |
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