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参数资料
| 型号： | APW7075OC-TUL |
| 厂商： | Anpec Electronics Corporation |
| 英文描述： | Step-Up Converter and LDO Combo |
| 中文描述： | 升压转换器和稳压器组合 |
| 文件页数： | 17/23页 |
| 文件大小： | 413K |
| 代理商： | APW7075OC-TUL |
Copyright
ANPEC Electronics Corp.
Rev. A.5 - Aug., 2005
APW 7075
www.anpec.com.tw
17
Function Description ( Cont.)
Low Battery Detection
The low battery detection is used to monitor the bat-
tery voltage and to generate a signal. This function
includes two pins, LBI is the inverting input of the com-
parator and LBO is an open drain output (see block
diagram). When the LBI voltage drops below the
threshold voltage 0.6V, the open drain device will turn
on and LBO becomes low. The Low battery threshold
voltage can be programmed with a resistive divider from
battery to LBI pin to ground. Since the LBO is an open
drain output, it usually requires an external pull-up
resistor.
Application I nformation
Output Voltage Selection
The output voltage of APW7075 can be adjusted by an
external resistor divider, or connect FB pin to OUT for
3.3V and to ground for 2.5V (see Application
Schematic). The internal reference voltage is 1.2V and
the allowed output voltage is from 2.5V to 5.5V. The
following equation can be used to calculate the output
voltage:
Programming Low Battery Threshold Voltage
The low battery threshold voltage can be programmed
with a resistive divider from battery to LBI pin to ground
(see Application Schematic). The internal reference
voltage is 0.6V, and the low battery threshold voltage
must be below the battery voltage. The following equa-
tion can be used to calculate the low battery thresh-
old voltage:
0.6V
R4
R3
1
V
TH
-
BAT
×
+
=
Inductor Selection
The APW7075 works well with a 22uH inductor in most
applications. The inductance values determine the in-
ductor ripple current and affect the output current.
Higher inductance values reduce ripple and improve
efficiency. Lower inductance values have fast response
but increase the ripple and reduce the efficiency. The
maximum allowed LX current is 1A (the maximun.
output current shows in Typical Characteristics) and
so the peak inductor current cannot exceed it. The
following equations calculate the inductor current, and
output current.
(
)
f
L
D
1
V
(V
IL
IN
OUT
×
×
=
)
I
OUT
= IL x (1-D)
LDO
The output voltage has two operation modes. When
VIN exceeds 3.9V, the output will become the LDO
regulator and the step-up converter will be disabled.
The LDO output is a P-channel low dropout regulator
with 1A current limit. When the VIN is below 3.8V, the
output will return to the step-up converter, and the LDO
mode will be disabled. Note that when LDO mode is
used, the output voltage should be under 3.8V
1.2V
R2
R1
1
V
OUT
×
+
=
Where:
D =
OUT
V
IN
OUT
V
V
相关PDF资料 |
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| APW7077AZBI-TUL | PWM Step-Up DC-DC Converter |
| APW7077RBI-TR | PWM Step-Up DC-DC Converter |
| APW7077RBI-TRL | PWM Step-Up DC-DC Converter |
| APW7077RBI-TU | PWM Step-Up DC-DC Converter |
| APW7077RBI-TUL | PWM Step-Up DC-DC Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| APW7077 | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| 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 |
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