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MR4530 Datasheet(PDF) 17 Page - Shindengen Electric Mfg.Co.Ltd

Part # MR4530
Description  Partial Resonance Power Supply ICModule
PDF  43 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

MR4530 Datasheet(HTML) 17 Page - Shindengen Electric Mfg.Co.Ltd

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4.5 Selecting constants for droop circuit
The following are methods of determining the constant of a droop circuit. They are recommended for the MR4000
Series standard power supplies.
4.5.1 MR45XX Series
The following is the method recommended for the MR45XX Series standard circuit.
(1)
Apply the following formula to calculate the overcurrent
detection resistance R114:
)
(I
I
V
R114
CP
DP
th(OCL)
[
Ω]
(2)
Adjust R117 on an actual board.
Set a droop point slightly higher than that set with R114.
This value will be on the order of several tens of kΩ.
4.5.2 MR40XX Series
The following method is recommended for the MR40XX Series standard circuit.
(1)
Apply the following formula to calculate the overcurrent
detection resistance R114:
)
(I
I
V
R114
CP
DP
th(OCL)
[
Ω]
(2)
Adjust R117 on an actual board.
Set a droop point slightly higher than that set with R114.
This value will be on the order of several tens of kΩ.
(3)
Select the voltage for DZ151, a zener diode that
compensates for droop based on the input voltage.
Apply the following formula to calculate the zener voltage:
The compensation beginning voltage is assumed to be 150 V.
P
C
N
N
150
1.3
ツェナ電圧
[V]
(4)
Adjust R151, a resistor that compensates for droop based on the input voltage, on an actual board.
The value of R151 is approximately 50 Ω.
(5)
Set C115 at about 2200 pF.
MR4000
D112
PH111
C115
R117
2
4
3
5
R114
Fig. 4.2 MR45XX Series droop circuit
Vth(OCL)
Overcurrent limit threshold voltage
IDP(ICP)
Drain (Collector) peak current at
maximum output power
MR4000
5
R114
D112
PH111
C115
R117
2
4
3
D151
R151
DZ151
Fig. 4.3 MR40XX Series droop circuit
Vth(OCL)
Overcurrent limit threshold voltage
IDP(ICP)
Drain (Collector) peak current at
maximum output power
4. Design procedure
Zener
voltage



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