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| 型號(hào)： | SP6660EP |
| 英文描述： | 200mA Charge Pump Inverter or Doubler |
| 中文描述： | 200毫安充電泵逆變器或倍增 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大小： | 284K |
| 代理商： | SP6660EP |
SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler
Copyright 2000 Sipex Corporation
14
Oscillator Control
Refer to
Figure 23
for a table of the four control
modes of the
SP6660
internal oscillator
frequencies. In the first mode, FC and OSC are
open (unconnected) and the internal oscillator
typically runs at 10kHz. OSC is internally
connected to a 15pF capacitor.
In the second mode, FC is connected to V+. The
charge and discharge current at OSC changes
from 1.0
μ
A to 8.0
μ
A, increasing the oscillator
frequency eight times to 80kHz.
In the third mode, the oscillator frequency is
lowered by connecting a capacitor between OSC
and GND. FC can still multiply the frequency
by eight times in this mode, but for a lower range
of frequencies. Refer to
Figure 11
for these ranges.
In the fourth mode, any standard CMOS logic
output can be used to drive OSC. OSC may be
overdriven by an external oscillator that swings
between V
and GND. When OSC is overdriven,
FC has no effect.
Unlike the 7660 and 660 industry standards,
designers may overdrive the oscillator of the
SP6660
in both the inverting and the Voltage
Doubling Mode.
Figure 23. Four control modes for the SP6660
Oscillator Frequency
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Optimizing Loss Conditions
Losses in
SP6660
applications can be anticipated
from the following:
1. Output Resistance:
V
LOSS
= I
LOAD
x R
OUT
where V
is the voltage drop due to the
SP6660
output resistance, I
is the load
current, and R
OUT
is the
SP6660
output resistance.
2. Charge Pump Capacitor ESR:
V
LOSSC1
≈
4 x ESR
C1
x I
LOAD
where V
is the voltage drop due to the
charge pump capacitor, C1, ESR
is the ESR of
C1, and I
is the load current. The loss in C1
is larger than the loss in the reservoir capacitor,
C2, because it handles a current almost four
times larger than the load current during charge-
pump operation. As a result of this, a change in
the capacitor ESR has a much greater impact on
the performance of the
SP6660
for C1 than for C2.
3. Reservoir Capacitor ESR:
V
LOSSC2
= ESR
C2
x I
LOAD
where V
is the voltage drop due to the
reservoir capacitor C2, ESR
is the ESR of C2,
and I
is the load current. Increasing the
capacitance of C2 and/or reducing its ESR
can reduce the output ripple that may be
caused by the charge pump. A designer can
filter high-frequency noise at the output
by implementing a low ESR capacitor at C2.
Generally, capacitors with larger capacitance
values and higher voltage ratings tend to
reduce ESR.
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| SP6660EU | 200mA Charge Pump Inverter or Doubler |
| SP6660CP | 200mA Charge Pump Inverter or Doubler |
| SP6660CU | 200mA Charge Pump Inverter or Doubler |
| SP6660 | 200mA Charge Pump Inverter or Doubler |
| SP6661 | High Frequency 200mA Charge Pump Inverter or Doubler |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6660EP-L | 功能描述:電荷泵 200mA Inverter or Doubler RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| SP6660EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:200mA Charge Pump Inverter or Doubler |
| SP6660EU-L | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 200mA Inverter or Doubler RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6660EU-L/TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 200mA Inverter or Doubler RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6661 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Frequency 200mA Charge Pump Inverter or Doubler |
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