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參數(shù)資料
| 型號(hào)： | SP829 |
| 英文描述： | High Efficiency Voltage Inverters |
| 中文描述： | 高效高壓變頻器 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 259K |
| 代理商： | SP829 |
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SP828DS/03 SP828/829 High Efficiency Voltage Inverters Copyright 1999 Sipex Corporation
DESCRIPTION
The
SP828/829
devices are CMOS Charge Pump
Voltage Converters that can be used to invert a
+1.5V to +5.5V input voltage. These devices are
ideal for designs involving battery-powered and
board level voltage conversion applications.
The typical operating frequency of the
SP828
is
12kHz. The typical operating frequency of the
SP829
is 35kHz. The
SP828
has a typical
operating current of 50
μ
A and the
SP829
operates at 130
μ
A. Both devices can output
25mA with a voltage drop of 500mV. These
devices are ideal for both battery-powered and
board level voltage inverter applications
combining a low quiescent current with high
efficiency (<95% over most of its load-current
range).
THEORY OF OPERATION
The
SP828/829
devices should theoretically
produce an inverted input voltage. In real world
applications, there are small voltage drops at the
output that reduce efficiency. The circuit of an
ideal voltage inverter can be found in
Figure 21.
The voltage inverters require two external
capacitors to store the charge. A description of
the two phases follows:
Phase 1
In the first phase of the clock cycle, switches S2
and S4 are opened and S1 and S3 closed. This
connects the flying capacitor, C1, from V
to
ground. C1 charges up to the input voltage applied
at V
IN
.
Phase 2
In the second phase of the clock cycle, switches
S2 and S4 are closed and S1 and S3 are opened.
This connects the flying capacitor, C1, in parallel
with the output capacitor, C2. The charge stored
in C1 is now transferred to C2. Simultaneously,
the negative side of C2 is connected to V
and
the positive side is connected to ground. With
the voltage across C2 smaller than the voltage
across C1, the charge flows from C1 to C2 until
the voltage at the V
OUT
equals -V
IN
.
Charge-Pump Output
The output of the
SP828/829
devices is not
regulated and therefore is dependent on the
output resistance and the amount of load current.
As the load current increases, losses may slightly
increase at the output and the voltage may become
slightly more positive. The loss at the negative
output, V
, equals the current draw, I
, from
V
times the negative converter's source
resistance, R
S
:
V
LOSS
= I
OUT
x R
S
.
The actual inverted output voltage at V
OUT
will
equal the inverted voltage difference of V
IN
and
V
LOSS
:
V
OUT
= -(V
IN
- V
LOSS
).
Efficiency
Theoretically, the total power loss of a switched
capacitor voltage converter can be summed up as
follows:
∑
P
LOSS
= P
INT
+ P
CAP
+ P
CONV
,
where P
is the total power loss, P
is the total
internal loss in the IC including any losses in the
MOSFET switches, P
CAP
is the resistive loss of
Figure 21. Circuit for an Ideal Voltage Inverter
C1
C2
S1
S3
S4
S2
V
OUT
V
IN
V
OUT
= -V
IN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP829EK | High Efficiency Voltage Inverters |
| SP8480 | Monolithic, 12-Bit Data Acquisition System |
| SP8480AP | Monolithic, 12-Bit Data Acquisition System |
| SP8480AS | Monolithic, 12-Bit Data Acquisition System |
| SP8480BP | Monolithic, 12-Bit Data Acquisition System |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP829EK | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:High Efficiency Voltage Inverters |
| SP82AL | 制造商:Hubbell Wiring Device-Kellems 功能描述:ALMOND PAINTED STEEL 2 GANG DUPLEX |
| SP82G | 制造商:Hubbell Wiring Device-Kellems 功能描述:GRAY PAINTED STEEL 2 GANG DUPLEX |
| SP83 | 制造商:Hubbell Wiring Device-Kellems 功能描述:3/3/2 SPLITTER, 1 IN 3 OUT |
| SP830 | 制造商:SIPAT 制造商全稱(chēng):SIPAT 功能描述:SAW filter technical specification |
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