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MR1721 の電気的特性と機能

MR1721のメーカーはShindengen Electricです、この部品の機能は「Partial Resonance PS IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 MR1721
部品説明 Partial Resonance PS IC
メーカ Shindengen Electric
ロゴ Shindengen Electric ロゴ 




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MR1721 Datasheet, MR1721 PDF,ピン配置, 機能
Vol.02-05-e / June2002
MR1000 Series
Standby-compatible Partial Resonance Power Supply IC Modules
Masaaki Hayashi - Electronic Device Div.Group Advanced Power Products Div.
Device Design Dept. Assistant Manager (Joined the company in 1989)
1
Introduction
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Energy conservation guidelines from the Ministry of Economy,
Trade and Industry’s Agency of Natural Resources and Energy
place considerable emphasis on reducing standby power
consumption of domestic electrical appliances. These guidelines
designate domestic electrical appliances as 'special devices', and
set target years and criteria for achieving these reductions based
on the 'top runner' system. They are characterized by a
considerable degree of severity in that, if targets cannot be
achieved, manufacturers are legally required to publicly
proclaim the fact, and to follow the recommendations of the
Agency of Natural Resources and Energy.
Domestic electrical appliances employing remote controls are
characterized by a standby time which is considerable in
proportion to the duration of daily use. While the absolute value
of the instantaneous power consumption is low, the proportion
of standby power consumption within the total annual power consumption is large, and demands for a
reduction in standby power consumption are therefore becoming increasingly vociferous.
The MR1000 Series products introduced in this paper are standby-compatible partial resonance power
supply IC modules consisting of a multi-chip module (MCM) comprising a control IC and two
MOSFET chips. The ability to develop a standby-compatible partial resonance power supply with a
minimum of external components facilitates a reduction in design time.
2
MR1000 Series Features
<Implementation of a partial resonance power supply with a simple circuit configuration.
<Use of the burst mode allows a reduction in standby power consumption. With a 100V input
power supply, input power is approximately 100mW at no-load.
<The module contains a start-up circuit to ensure stable start-up and to reduce start-up resistance.
<Full implementation of all protective functions.
These features are described below.
Password Vol.02-05-e MR1000 Series
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All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002

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MR1721 pdf, ピン配列
The burst method reduces switching
losses by reducing the number of
switching cycles per unit time, and is
therefore a very effective method of
reducing standby power consumption
at very small loads. The MR1000
Series burst mode employs burst
operation while controlling output,
improving output ripple and transient
response. Furthermore, as the IC
control current also reduces circuit
current wastage at burst oscillation
and halt, unnecessary circuit
operation is halted, reducing control
current during normal operation by
approximately half (comparison of
normal operation at 50kHz and burst
oscillation and halt).
VF/B(burst stop)
=0.8V
VF/B(burst start)
=1.8V
[VF/B]
----------------425mA
[ID]
[VOUT ripple]
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Fig.3 Standby Operation Sequence
2-3 Onboard Start-up Circuit
The IC incorporates a start-up circuit which is disconnected following power supply operation to
reduce power wastage. This circuit is particularly effective in improving efficiency during
standby, and as start-up current is limited to a fixed value, any change in start-up time is minimal
despite changes in input voltage, and thus ensuring stable start-up characteristics.
2-4 Soft Drive
The MR1000 Series supplies gate current for the main switching device from two drive circuit
systems. The first drive circuit system supplies a trigger voltage to switch the main switching
device ON without delay and with the optimum timing. The second drive circuit system supplies a
gate voltage at a constant current to the main switching device, reducing unnecessary gate drive
power, and controlling steep gate charge currents to reduce noise.
2-5 Malfunction Protection Function
The MR1000 Series incorporates a circuit to prevent ON timing malfunctions and thus ensure that
optimum partial resonance is maintained. At power supply ON and OFF, and in the case of a load
short, linking of the transformer control coil voltage used in detecting ON timing is occurs
readily when the main switching device is switched OFF, thus possibly resulting in a malfunction.
The MR1000 Series incorporates an ON-dead timer to disable the ON trigger for a period of 2.5µs
(typ.) after the main switching device is switched OFF, ensuring stable operation even under
transient conditions. A Leading Edge Blank (LEB) function is also incorporated to prevent
malfunctions due to resonance condenser discharge current and gate charge current.
Password Vol.02-05-e MR1000 Series
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All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002


3Pages


MR1721 電子部品, 半導体
The following graphs illustrate efficiency (steady-state, standby), burst mode input power, and input
feedback noise of the MR1520 standard power supply in Fig.6. Partial resonance operation improves
efficiency in steady-state operation and reduces noise, and burst mode operation during standby
reduces the number of switching cycles per unit time, thus reducing standby power consumption.
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100
80
60 Vin=80V
Vin=100V
40 Vin=132V
20
0
0 10 20 30 40
Output power [W]
Fig.7 Efficiency Characteristics (steady-state)
100
80
60 Vin=80V
Vin=100V
40 Vin=132V
20
0
0123
Output power [W]
Fig.8 Efficiency Characteristics (standby)
Password Vol.02-05-e MR1000 Series
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All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002

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共有リンク

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部品番号部品説明メーカ
MR1721

Partial Resonance PS IC

Shindengen Electric
Shindengen Electric
MR1722

(MR1xxx) Partial Resonance PS IC

Shindengen Electric
Shindengen Electric


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