參數(shù)資料
型號(hào)： MR2900
廠商： Shindengen Electric Manufacturing Company, Ltd.
英文描述： Provision for Standby mode operation Partial Resonance Power Supply IC Module
中文描述： 撥備待機(jī)模式操作局部共振電源IC模塊
文件頁(yè)數(shù)： 6/19頁(yè)
文件大小： 226K
代理商： MR2900
Shindengen Electric MFG.CO.,LTD
- 6 -
3.1 Start-up Circuit
In conventional start-up circuits employing a start-up
resistor, current continues to flow following power supply
start-up, thus wasting power and reducing efficiency,
particularly during standby.
See Fig.3.1 Comparison of Start-up Circuits - Conventional
Start-up Circuit.
In the MR2000 Series start-up circuit the start-up current is
supplied from the input voltage at power supply start-up,
and is shut-off when the power supply is in operation.
The start-up circuit supplies a current of 12mA (typical) from
the IC internal constant current source until the voltage at
the V
cc
pin reaches 14V (typical). This current is consumed
internally in the IC as well as being used as the charging
current for the condenser connected externally between the
V
cc
pin and GND.
This design allows a stable start-up only minimally
dependent upon input voltage.
When the voltage at the V
cc
pin reaches 14V (typical) the
start-up circuit is disconnected, the start-up current no
longer flows and oscillation begins simultaneously.
The current consumed in the IC is then supplied from the
control coil. See Fig.3.1 Comparison of Start-up Circuits -
MR2000 Start-up Circuit.
In the case of an instantaneous power failure or a load
short, oscillation is stopped when the voltage at the V
cc
pin reaches 8.5V, and when this voltage drops to 7.6V the start-up circuit
operates again and the voltage at the V
cc
pin then begins rising. See Fig.3.2.
Incorporation of the functions described above improve efficiency, particularly during standby, and reduces the number of start-up
resistors required, thus reducing the overall number of components.
Fig.3.1 Comparison of Start-up Circuits
Fig.3.2 Start-up Circuit Operation Sequence
3. Operation Description
MR2900
Application Note
Load short
Instantaneous power failure
【
V
OUT
】
V
CC(startup on)
=7.6V
【
V
CE
】
V
CC(stop)
=8.5V
V
CC(startup off)
=
V
CC(Start)
=14.0V
【
V
CC
】
【
Vin
】
Vcc pin
Vin pin
5
4
V
cc(startup off)
/V
cc(startup on)
14.5V/7.2V
【
MR2000 Start-up Circuit
】
Control coil
Start-up current switched off
following start-up, thus
eliminating the need for start-up
resistors.
【
Conventional Start-up Circuit
】
IC
Start-up
current
Start-up current flows even
during steady-state operation,
resulting in losses.
相關(guān)PDF資料
PDF描述
MR2920 Provision for Standby mode operation Partial Resonance Power Supply IC Module
MR2940 Provision for Standby mode operation Partial Resonance Power Supply IC Module
MS52C181A 131,072-Word × 8-Bit STATIC RAM +1,048,576-Word × 8-Bit One Time PROM(128k字×8位靜態(tài)RAM+1M字×8位 OTPROM)
MS52C182A 65,536-Word × 16-Bit or 131,072-Word × 8-Bit STATIC RAM +524,288-Word × 16-Bit or 1,048,576-Word × 8-Bit One Time PROM(64k字×16位或128k字×8位靜態(tài)RAM+512k字×16位或1M字×8位 OTPROM)
MS81V06160 (401,408-word ⅴ 16-bit) FIFO memory
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