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參數(shù)資料
| 型號： | GS7660 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Switched-Capacitor Voltage Converter |
| 中文描述： | 開關電容電壓轉換器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 112K |
| 代理商： | GS7660 |
GS7660
Vishay
formerly General Semiconductor
Document Number 74819
24-May-02
www.vishay.com
5
Pin Description
Pin
Name
Function
BOOST
Frequency Boost. Connecting BOOST to V
IN
increases the oscillator frequency by a factor of five.
When the oscillator is driven externally, BOOST has no effect and should be left open.
1
N.C.
No Connection
2
CAP+
Connection to positive terminal of Charge-Pump Capacitor
3
GND
Ground.For most applications, the positive terminal of the reservoir capacitor is connected to this pin.
4
CAP
–
Connection to negative terminal of Charge-Pump Capacitor
5
V
OUT
Negative Voltage Output.For most applications, the negative terminal of the reservoir capacitor is
connected to this pin.
6
LV
Low-Voltage Operation.Connect to ground for supply voltages below 3.5V.
7
OSC
Oscillator Control Input.Connecting an external capacitor reduces the oscillator frequency.
8
V
IN
Power Supply Positive Voltage Input.(1.5V to 6V).V
IN
is also the substrate connection.
Detailed Description
The GS7660 is a charge-pump voltage converter. The
basic operations is as follows: Switch pairs S1, S2 and S3,
S4 (Fig.7) are alternately closed and opened at the rate of
the oscillator frequency divided by two.
During the first half of the cycle, when S1 and S2 are
closed and S3 and S4 are open, bucket capacitor C1 is
charged by input voltage. During the second half of the
cycle, when the switches assume the opposite state,
capacitor C1 is connected in parallel with output capacitor
C2 and any voltage differential causes a transfer of charge
from C1 to C2. This process will continue until the voltage
across C2 equals the
–
V
IN
voltage.
In normal operation, the output voltage will be less than
–
V
IN
, since the switches have internal resistance and C2 is
being discharged by the load.
S1
V
IN
S2
S3
S4
C1
C2
V
OUT
= -(V
IN
)
Fig. 7
–
Ideal Voltage Inverter
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