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MS1003SH Datasheet(PDF) 3 Page - Shindengen Electric Mfg.Co.Ltd

Part # MS1003SH
Description  Control IC
PDF  41 Pages
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Manufacturer  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
Direct Link  http://www.shindengen.co.jp/
Logo SHINDENGEN - Shindengen Electric Mfg.Co.Ltd

MS1003SH Datasheet(HTML) 3 Page - Shindengen Electric Mfg.Co.Ltd

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MS1003SH･MS1004SH
Application Note Ver.2.2
SHINDENGEN ELECTRIC MFG. CO. , LTD
3/41
Contents
1. Overview
…
4
4. Pin functions
…
17
1.1
Introduction
…
4
4.1
Z/C pin
…
17
1.2
Characteristics
…
4
4.2
F/B pin
…
17
1.3
Applications
…
4
4.3
GND pin
…
17
1.4
Appearance and dimensions
…
4
4.4
OCL pin
…
17
1.5
Basic circuit configuration
…
5
4.5
VG pin
…
17
2. Block diagram
…
6
4.6
Vcc pin
…
17
2.1
Block diagram
…
6
4.7
Vin pin
…
17
2.2
Pin names
…
6
5. Design procedure
…
18
3. Circuit operation
…
7
5.1
Design flow chart
…
18
3.1
Startup
…
7
5.2
Example of main transformer
design conditions
…
19
3.1.1 Startup circuit
…
7
5.3
Formulas for main transformer
design
…
19
3.1.2 Soft start
…
8
5.4
Checking the operating points
…
21
3.1.3 Bias assist
…
8
5.4.1 Variables in formulas
…
22
3.2
Oscillation
…
9
3.2.1 On-trigger circuit
…
9
5.4.2 Formulas for obtaining
trough skip start power
…
22
3.2.2 Quasi-resonance
…
9
3.2.3 Soft drive
…
10
5.4.3 Formulas for obtaining
trough skip end power
…
22
3.2.4 Trough skip operation
…
10
3.2.5 Output voltage control
…
11
5.4.4 Formulas for obtaining
auto burst start/end power
…
24
3.3
Burst mode oscillation
…
11
3.3.1 AutoStby function
…
11
5.4.5 Formulas for obtaining
droop point power
…
24
3.3.2 Super standby mode
…
13
5.5
Pin design
…
27
3.4
Protection functions
…
14
5.5.1 Design procedure for the
Z/C pin (Pin 1)
…
27
3.4.1 Vcc overvoltage
protection latch
…
14
5.5.2 Design procedure for F/B
pin
…
29
3.4.2 Overcurrent protection
…
14
5.5.3 Design of OCL pin
…
30
3.4.3 Overload protection (timer
latch function)
…
15
5.5.4 Design of VG pin
…
31
3.4.4 VCC-GND short circuit
protection
…
16
5.5.5 Design of Vcc pin
…
32
3.4.5 Leading edge blank (LEB)
16
5.5.6 Setting resonating
capacitor
…
34
3.4.6 On-trigger malfunction
prevention circuit
…
16
6. Example circuit diagram
…
35
3.4.7 TSD
…
16
6.1
Circuit diagram
…
35
6.2
Calculations for example
circuit design
…
35



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