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K78U05-500 Datasheet(PDF) 2 Page - Crystek Corporation

Part # K78U05-500
Description  WIDE INPUT NON-ISOLATED & REGULATED SINGLE OUTPUT
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Manufacturer  CRYSTEKCRYSTAL [Crystek Corporation]
Direct Link  http://www.crystekcrystals.com/crystal/default.asp
Logo CRYSTEKCRYSTAL - Crystek Corporation

K78U05-500 Datasheet(HTML) 2 Page - Crystek Corporation

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The copyright and authority for the interpretation of the products are reserved by MORNSUN
Specifications subject to change without notice.
K78UXX-500(L)
A/1-2011
Page 2 of 4
TYPICAL CHARECTERISTICS
TYPICAL APPLICATION CIRCUIT
Operating Temp.(
)
C
Temperature Derating Graph
(figure 1)
K78UXX-500(L)
1
2
3
+Vin
GND
+Vout
GND
C1
(figure 2)
Note:
1. The regulator proposed to establish the input voltage by soft-start, no
plug and play, if the input voltage changes from low voltage to high voltage
abruptly, the regulator might be damaged.
2. If the applications is high-voltage input, the regulator must add an
external capacitor C1(≤47
μF/100V),to prevent voltage spikes caused by
damage to the module.
3. No parallel connection.
APPLICATION EXAMPLE
MODULES PROTECT RECOMMENDED CIRCUIT
High voltage input, Multiple Outputs, with greater load
K78U12-500(L)
1
2
3
+Vin
GND
GND
K7805-1000(L)
10
μF
+5V/850mA
C1
C2
+12V/100mA
Reverse protection
(figure 3)
Note:
1. the input current amount of the back-grade regulator and the pre-class load should
be less than or equal the max load current of the pre-class regulator.
2. If further filtering is required, please add components as per the above circuit(We
recommend not to add components), if request, please make sure the capacitors C1
≤47
μF,C2≤10μF more close to the back-grade regulator.
K78 UXX-500L
()
+Vin
+Vout
GND
GND
1
3
2
K78 UXX-50 0L
()
+Vin
+Vout-
GND
GND
1
3
2
Schottky Diode
Vout=
0.3V
(figure4)
EMC RECOMMENDED CIRCUIT
+Vin
GND
1.0F
μ
μF-3.3
0.5mH-2mH
0.68
μF-2.2F
μ
Vin
+Vo ut
GND
270 F-4
μ
70
μF
RL
0.5mH-2mH
1
2
3
(figure 5)
TEST CONFIGURATIONS (TA=25
°C)
1、FULL LOAD OUTPUT RIPPLE & NOISE MEASURED GRAPH
2、LOAD TRANSIENT RESPONSE WAVEFORM
(figure 6)
(figure 7)


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