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參數(shù)資料
| 型號： | AIC1639-30CX |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | 3-PIN ONE-CELL STEP-UP DC/DC CONVERTER |
| 中文描述： | 3引腳單細(xì)胞升壓型DC / DC變換器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 159K |
| 代理商： | AIC1639-30CX |
AIC1639
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1639-00 05/26/00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
8
APPLICATION INFORMATION
GENERAL DESCRIPTION
AIC1639 PFM (pluse frequency modulation) controller
ICs combine a switch mode regulator, push pull driver
(AIC1639), precision voltage reference, and voltage
detector in a single monolithic device. They offer both
extreme low quescient current, high efficiency, and
very low gate threshold voltage to ensure start-up with
low battery voltage ( 0.8V typ.). Designed to maxi-
mize battery life in protable products, and minimize
switching losses by only switching as needed service
the load.
PFM controllers transfer a discreate amount of energy
per cycle and regulate the output voltage by modulat-
ing switching frequency with the constant turn-on time.
Switching frequency depends on load, input voltage,
and inductor value, and it can range up to 100KHz.
When the output voltage drops, the error comparator
enable 100kHz oscillator that turns on the MOSFET
around 7.5us and 2.5us off time. Turning on the
MOSFET allows inductor current to ramp up, storing
energy in a magnetic field. When MOSFET turns off
that forces inductor current through diode to the out-
put capacitor and load. As the stored energy is de-
pleted, the current ramp down until the diode turns off.
At this point, inductor may ring due to residual energy
and stray capacitance. The output capacitor stores
charge when current flowing through the diode is high,
and release it when current is low, thereby maintain-
ing a steady voltage across the load.
As the load increases, the output capacitor dis-
charges faster and the error comparator initiates cy-
cles sooner, increasing the switching frequency. The
maximum duty cycle ensure adequate time for energy
tranfer to output during the second half each cycle.
Depending on circuit, PFM controller can operate in
either discontinuous mode or continuous conduction
mode. Continuous conduction mode means that the
inductor current does not ramp to zero during each
cycle.
+
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I
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Ico
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IN
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PK
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IN
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SW
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OUT
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DIS
Charge Co.
V
SW
Discharge Co.
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Discontinuous Conduction Mode
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AIC1639-30CZ | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-PIN ONE-CELL STEP-UP DC/DC CONVERTER |
| AIC1639-33CX | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-PIN ONE-CELL STEP-UP DC/DC CONVERTER |
| AIC1639-33CZ | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-PIN ONE-CELL STEP-UP DC/DC CONVERTER |
| AIC1639-50CX | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-PIN ONE-CELL STEP-UP DC/DC CONVERTER |
| AIC1639-50CZ | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-PIN ONE-CELL STEP-UP DC/DC CONVERTER |
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