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K781.8-1500R3
● No external heat sink required
● Short-circuit protection, overheat protection
- Product Description
- Parameter Introduction
- Precautions
-
● Efficiency as high as 92%
● Low ripple, noise
● No external heat sink required.
● Short-circuit protection, overheat protection
● Operating temperature range: -40℃~ +85℃
● Pin and LM 78 XX Series compatible
● Ultra-small SIP Packaging, meeting UL 94 - V0 Requirements
● High reliability ( MTTF ≥ 100 Ten thousand hours)
● International standard pin configuration
● 100 % Full-load aging
-
Product Model List
Model number
Rated Input Voltage (V)
Rated output
Typical Efficiency (%)
Maximum capacitive load
(uF)
Nominal
Scope
Voltage (V)
Current (mA)
Wine
Minimum
Maximum
K781.5-1500R3
24
6.5~28
1.5
1500
79
76
680
K781.8-1500R3
6.5~28
1.8
81
79
K782.5-1500R3
6.5~28
2.5
85
83
K7803-1500R3
6.5~28
3.3
87
86
K7805-1500R3
7~28
5
91
88
K786.5-1500R3
8.5~28
6.5
92
91
Note*: When the input voltage exceeds 30 VDC, an external 22 µF/50 V electrolytic capacitor must be connected to the input terminal to prevent voltage spikes from damaging the module. Output characteristics
Project
Conditions
Minimum
Typical
Maximum
Unit
Output voltage accuracy
100% load, input voltage across the full range
±2
±3
%
Line regulation
Input voltage range
±0.5
±0.75
Load Regulation Rate
Under nominal input conditions, the load varies from 10% to 100%.
±0.5
±1
Overheat protection
IC built-in
150
°C
Quiescent current
5
10
mA
Temperature coefficient
-40℃ ~ +85℃
±0.03
%/°C
Ripple & Noise
Bandwidth: 20 MHz, using the parallel‑line method.
25
75
mVp
Switching frequency
100% load, input voltage across the full range
300
KHz
Output short-circuit protection
Continuous short-circuit protection (self-resetting)
Input Filtering Type
Capacitor filtering
Reverse polarity input
Prohibition
Hot-swappable
Not supported
EMC Characteristics
EMI
Conducted interference
CISPR 32/EN 55032 Class B (see EMI circuit recommendations for details)
Radiated interference
CISPR 32/EN 55032 Class B (see EMI circuit recommendations for details)
EMS
Electrostatic discharge
IEC/EN61000-4-2 CONTACT ±4KV perf. Criteria B
Radiation immunity
IEC/EN61000-4-3 10V/M Performance. Criterion A
Pulse group immunity
IEC/EN 61000-4-4 ±2 kV (see EMS circuit recommendations for details) Performance Criterion B
Surge immunity
IEC/EN61000-4-5 LINE TO LINE ±2kV (see EMS circuit recommendations for details) Performance Criterion B
Conducted Emission Immunity
IEC/EN61000-4-6 3 VR. M. S Performance Criterion A
Immunity to voltage sags, dips, and short interruptions
IEC/EN61000-4-29 0%, 70% Performance Criterion B
General Characteristics
Project
Conditions
Minimum
Typical
Maximum
Unit
Storage humidity
No condensation
5
95
%
Operating temperature
-40
85
°C
Storage temperature
-55
125
Case temperature rise during operation
15
25
Pin soldering temperature resistance
Solder joint is 1.5 mm from the housing; apply for 10 seconds.
300
MTTF
MIL-HDBK-217@25℃
100
Ten thousand hours
Weight
2
Kerl
Cooling method
Natural air cooling
Housing material
Flame-retardant, heat-resistant plastic (UL94-V0)
-
Increase the external capacitors C1 and C2 appropriately based on the operating conditions, and ensure that these external capacitors are placed as close as possible to the pins of the K78 series.
For applications with stringent ripple‑noise requirements, an external LC filter circuit should be used. The inductor value is typically between 10 µH and 47 µH, while the capacitor can be a low‑ESR type or an electrolytic capacitor, as shown in the figure. Note that this product series does not support hot‑plugging at the input nor parallel connection of outputs.
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