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MR1721 PDF Datasheet - Partial Resonance PS IC - Shindengen Electric

Part Number MR1721
Description Partial Resonance PS IC
Manufacturers Shindengen Electric 
Logo Shindengen Electric Logo 
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MR1721 datasheet, circuit
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
P.01
All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002

1 page

MR1721 pdf, schematic
2-1 Basic Operation
Partial resonance power supplies are an
effective means of increasing efficiency
and reducing noise with a simple circuit
configuration. Partial resonance operation
requires detection of the secondary zero
current (0A) point, and determination of
the ON timing for the main switching
device. The MR1000 Series incorporates a
zero current detection pin (Z/C, pin 1), the
negative edge of the voltage in the control
coil (wound with opposite polarity to that
of the primary coil) being detected in the
main transformer and the main switching
device switched ON to detect the 0A point
of the secondary current. In order to
switch the main switching device ON at
the VDS resonance trough during partial
www.DartaeSshoeneat4nUc.ecomoperation it is necessary to
delay the ON timing for the primary
inductance by 1/2 of the resonance period
of the resonance condenser after the
secondary current reaches 0A, and simple
adjustment of the time constant of the
resistor and condenser connected to the IC
zero current detect pin (Z/C, pin 1) allows
the main switching device to be switched
ON at the VDS resonance trough.
0.2V
[Vz/c]
[ID]
[Secondary rectifying diode current]
[VDS]
[Control coil voltage]
Fig.1 ON Trigger Operation Sequence
2-2 Standby Functions
The MR1000 Series supports a
function to reduce power consumption
during standby by switching from the
normal operation mode to the burst
mode using an external signal. The
voltage at pin (1) is clamped to a
maximum of 2.9V (typ.) with a
microcomputer standby signal to
switch to the burst mode. Drain
current is then limited to IDP (burst) =
425mA (typ.), and intermittent
operation begins in which control of
the ON width is switched from linear
control of the voltage at the F/B pin
(pin (2)) to hysteresis operation in
which oscillation begins at VF/B >
1.8V and is halted at VF/B < 0.8V.
Drain pin
5
F/B pin
2
Z/C pin
1
GND pin
3
2.9V
(typ)
Standby signal
(external signal)
Output voltage
error detection
feedback signal
Fig.2 Standby Mode Selector Circuit
Password Vol.02-05-e MR1000 Series
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All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002

2 Page

MR1721 equivalent
Drain
5
Q1
IC1
1 Z/C
2 F/B
4 Vcc
3
GND
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10.0 0.2
Ø3.2
+0.2
-0.1
4.5 0.2
2.7 0.2
MR1520
2.7 0.3
0.7
+0.3
-0.1
4-1.7 0.3
0.95
+0.3
-0.1
0.5
+0.3
-0.1
2.65 0.3
6.75 0.5
12345
Pin numbers
Fig.4 Equivalent Circuit
Fig.5 Dimensions
4
Power Supply Characteristics (MR1520 standard power supply data)
L
F101
N
C102
TH101
T101
C201-2
L201
C101
FG
L101 C103
D101
C105
D201
C201-1
C202
R205
C104
C106
R101
IC101 5
R103
2
4
1
R106 D104
C108
R105
3
R102
D102 D103
R104
C110
C109
C107 PC101
PC102
C205
R201
C203
R206
C204
R202
R203
R208
PC102
R207
IC201
R204
TR201
+12V,3.5A
+12V
GND
SW201
R209
R210
Fig.6 MR1520 Standard Power Supply Circuit
85V to 132V input, 12V, 3.5A output
Password Vol.02-05-e MR1000 Series
P.05
All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002

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Information Total 8 Pages
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