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K78UXX-500(L) A/4-2019 Page 1 of 5
Patent Protection RoHS
K78UXX-500(L) Series
Wide input non-isolated and regulated single output
FEATURES
●High efficiency up to 95%
●Ultra-wide input voltage range up to 8:1
●Operating ambient temperature range: -40
to +85℃
●Pin-out compatible with LM78XX linear
regulators
●Short-circuit protection, over-temperature
protection
●Low output ripple & noise
●Ultra compact SIP package, meet UL94-V0
standards
●No heatsink required
●Industry standard pin-out
●MTBF>2,000,000 hours
APPLICATIONS
The K78UXX-500(L) series are high efficiency
switching regulators and ideal substitutes of
LM78XX series three-terminal linear regulators.
The product is featured with ultra-wide input
voltage range, high efficiency, low loss, low
radiation and no heat sink requirement.
MODEL SELECTION
K78U05-500
Ultra Wide Input Voltage
Output Voltage
Output Current
Product Series
MORNSUN Science & Technology Co.,Ltd.
Address: No. 5, Kehui St. 1, Kehui Development
Center, Science Ave., Guangzhou Science
City, Huangpu District, Guangzhou, P. R. China
Tel:86-20-38601850
Fax:86-20-38601272
E-mail:info@mornsun.cn
www.mornsun-power.com
Selection Guide
Part Number
Input Voltage(VDC)
Output
Nominal
Range
Voltage
(VDC)
Current(mA)
Vin
(Min.)
Vin
(Max.)
Min.
Max.
K78U03-500(L)
48
9.0~72.0
3.3
10
500
82
75
K78U05-500(L)
9.0~72.0
5.0
10
500
87
81
K78UX6-500(L)
9.0~72.0
6.5
10
500
91
84
K78U09-500(L)
14.0~72.0
9.0
10
500
92
86
K78U12-500(L)
17.0~72.0
12.0
10
500
93
89
K78U15-500(L)
20.0~72.0
15.0
10
500
94
90
K78U24-300(L)
36.0~72.0
24.0
6
300
95
91
Note: Add suffix “L” for 90°bend pins, for example: K78U05-500L.
Output Specifications
Item
Test conditions
Min.
Typ.
Max.
Units
Voltage Accuracy
100% load
--
±2
±3
%
Linear Regulation
Input voltage variation
from low to high at full load
--
±0.4
±1.0
Load Regulation*
From 10% to 100% Load
--
±0.3
±0.6
Ripple & Noise
20MHz bandwidth, from 10% to
100% Load (refer to figure 2 )
--
20
60
mVp-p
Short-circuit Input Power
Consumption
Vin=Nominal
--
0.72
1.2
W
Short-circuit Protection
Continuous, self-recovery
Over-temperature
Protection
--
160
--
℃
Switching Frequency
100% full load
120
--
800
kHz
Output Current Limit
Vin=Nominal
--
700
1200
mA
Static Current
Vin=Nominal , Min. Load
--
1
5
Temperature Coefficient
--
--
±0.015
%/℃
Dynamic Load
From 10% to 100% Load
--
--
±100
mV
--
1.0
1.5
ms
Capacitive Load (µF)
Max.
--
--
100
μF
Note: Pin of GND could not be left open, otherwise the module will be damaged.
General Specifications
Item
Test conditions
Min.
Typ.
Max.
Units
Storage humidity
--
--
95
%
Operating Temperature
Derating when operating
temperature up to 71℃
-40
--
85
℃
Operating Case
Temperature
--
65
100
Storage Temperature
-55
--
125
Pin Soldering Resistance
Temperature
Soldering spot is 1.5mm away
from case for 10 seconds
--
--
300
Cooling Method
Free air convection
Case Material
plastic; flame-retardant and
heat-resistant (UL94-V0)
MTBF
MIL-HDBK-217F@25℃
3500
--
--
k hours
MIL-HDBK-217F@71℃
1500
--
--
Hot Plug
Unavailable
Thermal Impedance
--
--
60
℃/W
CE
Refer to figure 5
EN55032, CLASS B
RE
ESD
IEC/EN 61000-4-2 level 4
Safety Certification
EN-60950-1
Weight
--
4.0
--
g
The copyright and authority for the interpretation of the products are reserved by MORNSUN Specifications subject to change without notice.
K78UXX-500(L) A/4-2019 Page 2 of 5
Typical Characteristic Curves
Design Reference
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,
hot plug is not available, if the input voltage changes from low to high
abruptly, the regulator might be damaged.
2. If the application in high-voltage, the regulator must add an external
capacitor C1(≤47μF/100V) to prevent voltage spikes damage to
the module.
3. The products do not support parallel connection of their output.
Design Reference
Modules Protection 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 sum of the total input current of the post-stage regulator and the load
current of the pre-stage regulator should be less than or equal to the maximum
load current of the pre-stage regulator.
2. For further filtering, please add capacitors according to the above figure
(this series is not recommended), if needed, please make sure C1≤47μF, C2≤
10μF and make them as close as possible to the post-stage regulator.
K78UXX-500 L
( )
+Vin +Vout
GND GND
13
2
K78UXX-500 L
( )
+Vin +Vout-
GND GND
13
2Schottky Diode
Vout=
0.3V
(figure4)
EMC compliance circuit
+Vin
GND
1.0 FμμF-3.3
0.5mH-2mH
0.68μF-2.2 Fμ
Vin +Vo u t
GND
270 F-4μ 70μF
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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K78UXX-500(L) A/4-2019 Page 3 of 5
Typical Characteristics Curves
Efficiency Ripple
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K78UXX-500(L) A/4-2019 Page 4 of 5
Outline Dimensions & Footprint Details
1
3
2
+Vin
GND
+Vout
FOOTPR INT D ETAIL S
L=530mm[20.866inch] Devices per tube quantity: 44pcs
L=220mm[8.661inch] Devices per tube quantity: 17pcs
Short tube inner packaging dimensions: L*W*H=255*170*80mm
Short tube outer packaging dimensions(with six inner packaging boxes):
L*W*H=375*280*270mm
Long tube inner packaging dimensions: L*W*H=580*200*100mm
Long tube outer packaging dimensions(with two inner packaging boxes):
L*W*H=600*215*220mm
Long tube outer packaging dimensions(with three inner packaging boxes):
L*W*H=600*215*325mm
Pin Function
11.60 [0.457]
27.10 [1.067]
20.60 [0.811]
6.60 [0.260]
K78UXX-500L
11.40 [0.449]
23.40 [0.921]
20.40 [0.803]
11.00 [0.433]
16.00 [0.630]
K78UXX-500
K78UXX-500LK78UXX-500
4.20 [0.205]
MECHANICAL DIMENSIONS RECOMMENDED FOOTPRINT
TUBE OUTLINE DIMENSIONS
(Bottom View)
5.08 [0.200]
4.10 [0.161]
17.50
[0.689]
0.50 [0.020]
9.00 [0.354]
11.50
[0.453]
0.50 [0.020]
0.55 [0.022]
2.15 [0.085]
1 2 3
9.00
[0.354]
17.5 0 [0.68 9]
0.3 0 [0.01 2]
1 9.00 [0 .748]
Ф1.00 [Ф0.039]
1 2 3
Note:
grid:2.54*2.54mm.
K78UXX-500
3 2 1
Ф1.00 [0.039]
K78UXX-500L
(Bottom View)
(Front View)
(Front View)
Note:
Unit:mm[inch]
Pin section tolerances:±0.10mm[±0.004inch]
General tolerances:±0.25mm[±0.010inch]
Note:
Unit:mm[inch]
Pin section tolerances:±0.10mm[±0.004inch]
General tolerances:±0.25mm[±0.010inch]
Note:
Unit:mm[inch]
General tolerances:±0.50mm[±0.020inch]
11.50
[0.453]
5.08 [0.200]
0.55 [0.022]
4.10 [0.161]
1 2 3
0.50 [0.020]
Note:
1.We suggested to use module at load of over 10%, and the external capacitor for output should not be too large (recommend
<10μF), otherwise ripple will increase dramatically;
2.If the product is not operated within the required load range, the product performance cannot be guaranteed to comply with all
parameters in the datasheet, but does not damage the product;
3.Unless otherwise specified, parameters in this datasheet were measured under the conditions of Ta=25℃, humidity<75%RH with
nominal input voltage and rated output load;
4. All index testing methods in this datasheet are based on our company corporate standards;
5.Products are related to laws and regulations: see "Features" and "General Specifications";
6.Our products shall be classified according to ISO14001 and related environmental laws and regulations, and shall be handled by
qualified units.