K78XX-500R3 Series-0.5A
Non-isolated
Non-isolated DC-DC Converters
K78XX-500R3 Series – 0.5A
Features
Efficiency up to 94%, no heatsinks required
Pin-out compatible with LM78XX linears
Low profile (L/W/H=11.6 x 10.4 x 7.6mm)
Short circuit protection, thermal shutdown
Operating ambient temperature range: -40℃to +85℃
EN/IEC 60950-1, 2nd Edition, EN55032 safety meets
Description
The K78KXX-500R3-Series are high efficiency switching regulators and ideal substitutes for
LM78xx series three-terminal linear regulators. The converters feature high efficiency, low
loss, short circuit protection, and there is no need for a heat sink.
These products are widely used in applications such as industrial control, instrumentation
and electric power.
Technical Specification All specifications are typical at nominal input, full load and 25°C unless otherwise stated.
Input Voltage
Range
Output
Voltage
(V)
Min. Load (1)
K7803-500R3
4.75-36V
Nominal: 24V
3.3
K7805-500R3
6.5-36V
Nominal: 24V
K7812-500R3
15-36V
Nominal: 24V
Model
Number
Full. Load
Full Load
Efficiency(%) Typ.
Vin Min./ Vin Max.
Capacitive
Load(uF)
Max.
0
500
86/80
680
5
0
500
93/84
680
12
0
500
94/91
680
E-mail: bothhand_sales@bothhandww.com
Output Current (mA)
https://www.bothhandww.com
Rev: A0
Page 1 of 6
Input Specifications
Input voltage
4.75V Min.
36V max.
Capacitor
24V nominal input
Input filter
Input Reverse Polarity
See Positive to Negative Converter,
install external fuse(1A Fast blow)
No Load Input Current
1.5mA max.
Short Circuit Input Current
10mA Typ,30mA max.
Hot swap is not supported
Environmental Specifications
Operating ambient temperature
with derating
-40°C to +85°C
Storage temperature range
-55°C to +125°C
Maximum case temperature
Operating humidity
+100°C
Non-condensing
95% RH max.
Temperature coefficient
±0.015% / °C Typ.
RoHS Compliant
RoHS 2.0
Output Specifications
Voltage accuracy
At 100% load
Line regulation
Vin=min. to max. Vout=100% load
Load Regulation
Vin=nom. Vout=10 -100% load
Ripple and Noise (20MHz Bandwidth)(4)
Vin=nom. Vout=100% load
±2.0% Typ
±4.0% max.
±0.4% Typ
±1.0% max.
±0.3% Typ
±0.6% max.
75mVp-p Typ.
100mVp-p max.
Capacitive load
Over Current Protection(OCP)
680uF max
100%=0.5A
200~400%
Short Circuit Protection (SCP)
Continuous, autorecovery
General Specifications
Efficiency
See table
Switching frequency
Pulse width modulation(PWM), Vin=nom.
Dynamic load response
75-100-75% load step
MTBF
According to MIL-HDBK-217F,G.B. +25°C
2.0× 106Hrs min
Safety(5)
IEC/EN60950-1,2nd Edition,EN55032
meet
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