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参数资料
| 型号： | APW7077 |
| 厂商： | Anpec Electronics Corporation |
| 元件分类： | DC/DC变换器 |
| 英文描述： | PWM Step-Up DC-DC Converter |
| 中文描述： | PWM升压型DC - DC转换器 |
| 文件页数： | 11/21页 |
| 文件大小： | 444K |
| 代理商： | APW7077 |
Copyright
ANPEC Electronics Corp.
Rev. A.4 - S ep, 2005
APW 7077/ A
www.anpec.com.tw
11
Typical Characteristics ( Cont.)
0.980
0.985
0.990
0.995
1.000
1.005
1.010
1.015
1.020
-40
-20
0
2 0
4 0
60
8 0
Temperature (
°
C)
F
Feedback Voltage vs. Temperature
Function Description
Operation
The APW7077/A series are low noise fixed frequency
voltage–mode PWM DC–DC controllers, and consist
of start–up circuit, reference voltage, oscillator, loop
compensation network, PWM control circuit, and low
ON resistance driver.
APW7077 provide on–chip feedback resistor and loop
compensation network, the system designer can get
the regulated fixed output voltage 3.3V and 5.0V with
a small number of external components, it is optimized
for battery powered portable products where large
output current is required. APW7077A provide internal
reference voltage 1.0V and output voltage setting by
external resistance for higher voltage requirement. The
quiescent current is typically 120uA (V
OUT
= 3.3V,
fsw = 300kHz), and can be further reduced to about
1.0uA when the chip is disabled (V
CE
< 0.7V).
The APW7077/A operation can be best understood by
referring to the block diagram. The error amplifier
monitors the output voltage via the feedback resistor
divider by comparing the feedback voltage with the
reference voltage. When the feedback voltage is lower
than the reference voltage, the error amplifier output
will decrease. The error amplifier output is then
compared with the oscillator ramp voltage at the PWM
controller.
When the feedback voltage is higher than the reference
voltage, the error amplifier output increases and the
duty cycle decreases. When the external power switch
is on, the current ramps up in the inductor, storing
energy in the magnetic field. When the external power
switch is off, the energy stored in the magnetic field is
transferred to the output filter capacitor and the load.
The output filter capacitor stores the charge while the
相关PDF资料 |
PDF描述 |
|---|---|
| APW7077ARBI-TR | PWM Step-Up DC-DC Converter |
| APW7077ARBI-TRL | PWM Step-Up DC-DC Converter |
| APW7077ARBI-TU | PWM Step-Up DC-DC Converter |
| APW7077ARBI-TUL | PWM Step-Up DC-DC Converter |
| APW7077AZBI-TR | PWM Step-Up DC-DC Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| APW7077ARBI-TR | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| APW7077ARBI-TRL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| APW7077ARBI-TU | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| APW7077ARBI-TUL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| APW7077AZBI-TR | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
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