參數(shù)資料
型號: AN8083
廠商: Panasonic Corporation
英文描述: Quad, 14-Bit nanoDAC® with 5ppm/°C On-Chip Reference; Package: MSOP; No of Pins: 10; Temperature Range: Industrial
中文描述: 低電壓直流運行集成電路- DC轉(zhuǎn)換器
文件頁數(shù): 4/5頁
文件大小: 62K
代理商: AN8083
ICs for CD/CD-ROM Player
AN8083S
8
9
10
11
5
16
13
15
+
1.5V
1.5V
SW
Oscillation starts at “L.”
“L” when the battery voltage is 2.15V or less.
“H” when the secondary voltage is 4.2V or more.
Oscillation synchronization signal
Power OFF at “L”
P–V
CC
V
CC
OUT
AN8083S
Power SW
Start
CPU
1) When Pin10 becomes “L” by operation of CPU or
push switch, oscillation starts and boosted voltage is
outputted to the secondary side.
2) When the secondary side voltage exceeds 3.6V, starter
circuit is stopped and PWM operation is started by using
the voltage in the secondary side as power supply.
3) When the secondary side voltage becomes 4.2V,
Pin15 becomes “H” and CPU operation is started.
4) When “L” pulse is sent from CPU to Pin11, oscillation
is stopped and it enters the stand-by mode. In this
status consumption current is 2
μ
A max.
5) For re-start, when Pin10 becomes “L” by operation of
CPU or push switch, oscillation starts.
CLK
RESET
EMP
I
Supplementary Explanation
Operational Description
When power V
CC
pin (Pin8) is connected to the supply output and start pin (Pin10) is set to “Low,” the triangular oscillation is
outputted to CT pin (Pin7) and the rectangular wave to OUT pin (Pin5). In this condition, called start condition, PWM control is not
obtained and only oscillation is repeated. By this oscillation at start, supply output is increased. This supply output voltage is
inputted to V
CC
pin (Pin16) of the AN8083S. When the voltage of V
CC
pin becomes 3V or more, start oscillation is stopped and
oscillation in normal operation is outputted. PWM control is started only after entering normal mode. The voltage switching
between start and normal operation has 0.5V hysteresis. When power pin (Pin11) is set to “High” in normal operation, normal mode
oscillation is started. In this status, output of the supply is 4.8V fixed.
Other features
1. Short-circuit protection feature
For normal mode oscillation, when output/FB pin (Pin2) of error amplifier is in “High” condition, oscillation is stopped, since the
power supply system is judged to be in an abnormal condition. With the time constant of discharged current I
SPRO
of SPRO pin
(Pin3) and capacitor C
SPRO
, pin voltage is increased, and oscillation is stopped when it becomes 1.25V or more. During this time,
when the error amplifier becomes “Low,” charged current no longer exits and SPRO is maintained to 0.9V.
2. Decreased voltage detection circuit
When V
SEN
pin (Pin14) gets 2.15V or less, EMS pin (Pin13) gets “High.”
3. Reset output
When V
CC
pin voltage is 4.2V or more, RST pin (Pin15) gets “High.”
I
System Block Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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