K78LXX-500R2 series high efficiency switching regulators
are ideally suited to replace 78xx linear regulators and are pin
compatible.
SELECTION GUIDE
Input Voltage(VDC)
Part Number
Nominal
K78L03-500R2
K78L05-500R2
12
12
Range
4.75-18
7.0-18
Ouput Voltage
(VDC)
3.3
5.0
Ouput Current
(mA)
500
500
Efficiency (%,max)
Vin(Min)
90
93
Vin (Max)
83
86
INPUT
SPECIFICATIONS
Item
No-load Input Power
Reverse Polarity Input
Input Filter
Test Conditions
Input Voltage Range
Min.
--
Typ.
0.096
Max.
0.144
Forbidden
Capacitance Filter（1μF）
Unit
W
OUTPUT SPECIFICATIONS
Item
Output Voltage accuracy
Line Regulation
Load Regulation
Switching Frequency
Output Current Limit
Temperature Drift
Ripple & Noise*
Over Temperature Protection
Short circuit input power
Short circuit protection
Max. Capacitive Load
--
-40℃½+85
℃
20MHz bandwidth(refer to figure 2)
IC inside
Input Voltage Range
Test Conditions
100% load，input voltage range
Input voltage range
From 10% to 100% full load
100% load, input Voltage Range
Min.
--
--
--
350
--
--
--
--
--
Typ.
±2
±0.4
±0.4
400
--
--
20
--
0.8
Max.
±3
±0.6
±0.6
450
2800
±0.02
35
160
1.8
KHz
mA
%/°C
mVp-p
℃
W
%
Unit
Continuous, automatic recovery
--
1000
µF
Note:* Ripple and noise tested by
“parallel
cable” method. See detailed operation instructions at Testing of Power Converter section, application notes.
COMMON SPECIFICATIONS
Item
MTBF
Case material
The copyright and authority for the interpretation of the products are reserved by MORNSUN
Test Conditions
MIL-HDBK-217F@25℃
Min.
2000
Typ.
--
Max.
--
Unit
K hours
Plastic(UL94-V0)
K78LXX-500R2
A/0-2012
Page 1 of 4
Dimensions
Weight
--
11.60*7.50*10.20
2.0
--
mm
g
ENVIRONMENTAL SPECIFICATIONS
Item
Storage Humidity
Operating Temperature
Storage Temperature
The Max. Case Temperature
Lead Temperature
Cooling
Operating temperature curve range
1.5mm from case for 10 seconds
Test Conditions
Non condensing
Power derating (above 71℃)
Min.
--
-40
-55
--
--
Typ.
--
--
--
--
--
Max.
95
85
125
100
300
°C
Unit
%
Free air convection
EMC SPECIFICATIONS
EMI
CE
RE
ESD
RS
EFT
EMS
Surge
CS
Voltage dips、short and
interruptions immunity
CISPR22/EN55022
CISPR22/EN55022
IEC/EN 61000-4-2
IEC/EN 61000-4-3
IEC/EN 61000-4-4
IEC/EN 61000-4-5
IEC/EN 61000-4-6
IEC/EN 61000-4-29
CLASS B
CLASS B
（External
Circuit Refer to Figure1-②）
（External
Circuit Refer to Figure1-②）
perf. Criteria B
perf. Criteria A
perf. Criteria B
（External
Circuit Refer to Figure 1-①）
perf. Criteria B
（External
Circuit Refer to Figure 1-①）
perf. Criteria A
perf. Criteria B
Contact
±4KV
10V/m
±2KV
±2KV
3Vr.ms
0%-70%
EMC RECOMMENDED CIRCUIT
Recommended external circuit parameters:
FUSE
V in
+
MOV
GN D
TVS
C1
C0
LD M1
LDM2
+Vin
EUT
+Vout
GND
LOAD
Components
Standard Parameter
FUSE
Choose according to practical input current
MOV
LDM1
TVS
C0
C1
LDM2
10D560
82μH
SMCJ36A
470μF/25V
4.7μF/50V
12μH
①
②
(Figure 1) EMC Recommended Circuit
Note: In Figure 1,part
①
is EMS recommended external circuit, part
②
is EMI recommended
external circuit. Choose according to requirements.
EMC RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 2)
EMC TEST WAVEFORM(CLASS B APPLY CIRCUIT)
K78L05-500R2
CE (Positive line)
K78L05-500R2
CE (Negative line)
A/0-2012
Page 2 of 4
The copyright and authority for the interpretation of the products are reserved by MORNSUN
K78LXX-500R2
TYPICAL APPLICATION CIRCUIT
1
C1
GND
(Figure 3)
+Vin
K78LXX-500R2
3
+Vout
C2
GND
2
EXTERNAL CAPACITOR TABLE
Part
Number
K78L03-500R2
K78L05-500R2
C1
(Ceramic Capacitor)
10μF/25V
C2
(Ceramic Capacitor)
10μF/6.3V
10μF/10V
Note：
1. General apply to the application-environment, C1 and C2 can be added in the circuit, and they should be placed as near as the products' footprints.
2. The capacitance of C1,C2 sees external capacitor table, it can be increased properly if required, and tantalum or low ESR electrolytic capacitors may also suffice.
3.
Cannot use in parallel for output and hot swap for input.
TEST CONFIGURATIONS (TA=25°C)
1.Efficiency and Output Voltage Ripple Test
2 5.4 mm
2 5.4 mm
1 2.7mm
+Vin
1
C1
2
C2
Ce rami c Ta nta lum
S cope
GND
Cop per strip
(Figure 4)
2.Start-up and Load Transient Response Test
50.8 mm
+Vin
1
C1
DC/DC
3
Converter
2
C2
Copp er strip
Vout
2.54 mm
S cope
GND
Copp er strip
(Figure 5)
OUTPUT RIPPLE REDUCTION
+Vin
1
C1
DC/DC
3
Converter
2
Vout
L
C2
2 2
μ
F
GND
To reduce output ripple, it is recommended to add a LC filter in output port.
L: Recommended parameter 10μH ~ 47μH.
(Figure 6)
TYPICAL
DERATING CURVE
Operating Temperature
(
C
)
The copyright and authority for the interpretation of the products are reserved by MORNSUN
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