MR2900
Application Note
Contents
1. Outline
1.1 Introduction
1.2 Characteristics
1.3 Applications
1.4 Absolute Maximum Ratings
and Reference Output Capacities
1.5 Equivalent Circuit and Dimensions
2. Block Diagram
2.1 Block Diagram
2.2 Pin Function Description
3. Operation Description
3.1 Start-up Circuit
3.2 On-trigger Circuit
3.3 Partial Resonance
3.4 Standby Mode Control
3.5 Output Voltage Control
3.6 Soft Drive Circuit
3.7 Circuit for Load Shorts
3.8 Collector Pin (pin 7)
3.9 Thermal Shut-down Circuit (TSD)
3.10 Over-voltage Protection Circuit (OVP)
3.11 Malfunction Prevention Circuit
(patent applied for)
3.12 Over-current Protection Circuit
4. Standard Circuit
5. Design Procedures
5.1 Design Flow Chart
5.2 Main Transformer Design Procedure
5.3 Main Transformer Design Examples
5.4 Selection of Constants for
Peripheral Components
6. Cooling Design
6.1 Junction Temperature and Power Losses
6.2 Junction Temperature
and Thermal Resistance
6.3 Cautions for Cooling Design
…
…
…
19
19
19
…
…
…
…
13
13
15
18
…
…
…
…
…
…
…
…
…
…
…
…
…
6
7
7
8
9
9
10
10
10
10
11
11
12
…
…
5
5
…
…
…
…
…
4
4
4
4
4
The values presented in this document are based on tentative specifications as of June 29th, 2001, and may change in future
Shindengen Electric MFG.CO.,LTD
- 3 -
SHINDENGEN [ SHINDENGEN ELECTRIC MFG.CO.LTD ]
