MR2900
Application Note
1.1 Introduction
1. Outline
The MR2900 Series IC modules are designed for both 200V and autosensing input with a burst-mode switching function at micro-
loads. These modules are of the partial resonance type, and are comprised of a switching device optimized for both 200V and
autosensing power supply input, and a control IC. They are designed to provide the following power supply characteristics.
1.2 Characteristics
1. An ultra high-speed IGBT with 900V resistance ensures high efficiency and low noise at partial resonance.
2. An ultra high-speed IGBT with 900V resistance simplifies design for autosensing power supply input.
3. Very low power consumption at micro-loads (in burst mode).
4. Onboard start-up circuit eliminates the need for start-up resistors.
5. Soft drive circuit achieves low noise levels.
6. Excess current protection function (ton limit, primary current limit).
7. Excess voltage protection and thermal shut-down function.
8. Power supply circuits may be constructed with a minimum of external components.
9. The use of a full mold package provides benefits in insulation design.
1.3 Applications
TVs, displays, printers, VTR, DVD, STB, air-conditioners, refrigerators, and other electrical appliances, and office equipment.
1.4 Absolute Maximum Ratings and Reference Output Capacities
Absolute maximum ratings
Model
MR2920
MR2940
Peak input voltage
V
in
［V�½
900
Peak input current
I
in
［A�½
7
10
Maximum output capacity P
o
［W�½
Input voltage range
90V to 276VAC
100
150
180V to 276VAC
150
225
Maximum output capacity and input voltage range differ with design conditions.
1.5 Equivalent Circuit and Dimensions
φ3.2
20.0
±0.2
Collector Z/C
7
1
3.0
±0.2
2
Q1
IC1
4
5
6
Emitter/OCL
V
cc
V
in
11.8
±0.5
2.4
±0.2
4.2
±0.5
7.6
±0.5
3
F/B
GND
8.0
12.0
+0.2
-0.1
5.0
±0.2
4.2
16.7
±0.3
2.7
±0.2
2.54
±0.2
6×1.7
±0.3
=15.24
±0.3
0.7
+0.3
-0.1
4.5
±0.5
0.7
±0.2
Shindengen Electric MFG.CO.,LTD
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SHINDENGEN [ SHINDENGEN ELECTRIC MFG.CO.LTD ]
