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K781.5-2000R3
● Low ripple and noise
● No external heat sink required
- Product Description
- Parameter Introduction
- Precautions
-
● Efficiency as high as 95 %
● 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
smallest
Maximum
K781.5-2000R3
12
7~28
1.5
2000
79
76
680
K781.8-2000R3
12
7~28
1.8
81
79
680
K782.5-2000R3
24
7~28
2.5
85
83
680
K7803-2000R3
24
7~28
3.3
87
86
680
K7805-2000R3
24
7~28
5
91
88
680
K786.5-2000R3
24
8.5~28
6.5
92
91
680
K7812-2000R3
24
16~28
12
94
92
680
K7815-2000R3
24
19~30
24
95
94
100
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 damage to the module caused by voltage spikes. Output characteristics
Project
Conditions
smallest
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 perf. Criteria 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 smallest Typical Maximum Unit Storage humidity No condensation 5 95 % Operating temperature -40 85 °C Storage temperature -55 125 Shell 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 operation at the output.
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