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Mean Well

Mean Well NFM-20-3.3 Power Supply 20W 3.3V 4.5A

SKU NFM-20-3.3
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End of Life, Succeeded by MFM-20-3.3
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Overview

NFM-20-3.3 is the 3.3V output model of this series: rated current 4.5A, rated power 14.85W, typical efficiency 71%.

Features

  • Universal AC input / Full range
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Ultra-miniature size, light weight
  • Cooling by free air convection
  • Medical safety approved (2 x MOPP between primary to secondary)
  • No load power consumption<0.75W
  • 100% full load burn-in test
  • Optional on-board type version available
  • Fixed switching frequency at 90KHz
  • High reliability
  • Suitable for BF application with appropriate system consideration
  • 3 years warranty

Specifications

NFM-20-3.3Specifications from the official datasheet (2022-09-20 edition)

OUTPUT

DC VOLTAGE
3.3V
RATED CURRENT
4.5A
CURRENT RANGE
0 ~ 4.5A
RATED POWER
14.85W
RIPPLE & NOISE (max.)Note.2
80mVp-p
VOLTAGE ADJ. RANGE
3.1 ~ 3.6V
VOLTAGE TOLERANCENote.3
±2.0%
LINE REGULATION
±1.0%
LOAD REGULATION
±1.5%
SETUP, RISE TIME
500ms, 20ms/230VAC 500ms, 20ms/115VAC at full load
HOLD UP TIME (Typ.)
50ms/230VAC 15ms/115VAC at full load

INPUT

VOLTAGE RANGE
85 ~ 264VAC 120 ~ 370VDC
FREQUENCY RANGE
47 ~ 440Hz
EFFICIENCY (Typ.)
71%
AC CURRENT (Typ.)
0.6A/115VAC 0.4A/230VAC
INRUSH CURRENT (Typ.)
COLD START 30A/115VAC 65A/230VAC
LEAKAGE CURRENTNote.6
Earth leakage current < 300μ A/264VAC , Touch current < 100μ A/264VAC

PROTECTION

OVERLOAD
Above 105% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE
3.8 ~ 4.46V Protection type : Shut off o/p voltage, clamping by zener diode
OVER TEMPERATURENote.5
Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-20 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS
ANSI/AAMI ES60601-1,TUV EN60601-1, IEC60601-1, EAC TP TC 004 approved
ISOLATION LEVEL
Primary-Secondary: 2xMOPP, Primary-Earth:1xMOPP, Secondary-Earth:1xMOPP
WITHSTAND VOLTAGE
I/P-O/P:4KVAC I/P-FG:2KVAC O/P-FG:1.5KVAC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION
Compliance to EN55011(CISPR11),EN55032 (CISPR32) Class B, EN61000-3-2,-3, EAC TP TC 020
EMC IMMUNITY
Compliance to EN61000-4-2,3,4,5,6,8,11, EN55035, EN60601-1-2, EN61204-3, medical level, EAC TP TC 020

OTHERS

MTBF
487.8Khrs min. MIL-HDBK-217F (25℃)
DIMENSION
89*51*19.3mm (L*W*H)
PACKING
0.09Kg; 105pcs/10.5Kg/0.94CUFT
Test conditions and notes7
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
  2. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on http://www.meanwell.com)
  5. 5. The over temperature protection (OTP) is the built-in function of the control IC (U1). The activating level described above is based on the specification provided by the IC manufacturer.
  6. 6. Touch current was measured from primary input to DC output.
  7. 7. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

NFM-20-3.3 Mechanical Specification
Mechanical Specification
NFM-20-3.3 Block Diagram
Block Diagram
NFM-20-3.3 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the NFM-20-3.3 for a 3.3V embedded controller in industrial equipment?

Yes, it is a constant-voltage 3.3V model intended for loads that need a regulated 3.3V supply. It can support up to 4.5A and 14.85W, so it fits embedded control boards that stay within those limits.

Is the NFM-20-3.3 suitable for 3.3V sensor or communication boards inside an automation panel?

It can be a fit when the electronics require 3.3V constant voltage and the combined load does not exceed 4.5A or 14.85W. That makes it more appropriate for low-voltage control electronics than for higher-voltage field devices.

Can this 3.3V power supply run a small group of 3.3V logic modules or SBC-type boards?

Yes, if the total demand stays within 3.3V, 4.5A, and 14.85W. The wide 85-264VAC input also helps when the equipment needs the same supply across different AC mains conditions.

Is the NFM-20-3.3 a good choice for low-voltage industrial IT hardware that uses 3.3V rails?

It is intended for constant-voltage 3.3V loads and provides up to 4.5A. For compact low-voltage boards or control electronics that stay under 14.85W, the electrical range matches that kind of use well.

How does the NFM-20-3.3 compare with the other NFM series output options?

Within the 3.3V versions, the series steps from NFM-05-3.3 at 4.125W and 1.25A to NFM-10-3.3 at 8.25W and 2.5A, NFM-15-3.3 at 11.5W and 3.5A, and this NFM-20-3.3 at 14.85W and 4.5A. Other NFM outputs include 5V models from 5W and 1A up to 22W and 4.4A, 12V models from 5.04W and 0.42A up to 21.6W and 1.8A, 15V models from 4.95W and 0.33A up to 21W and 1.4A, and 24V models from 5.52W and 0.23A up to 22.08W and 0.92A.

Can the NFM-20-3.3 be used in outdoor or temperature-variable equipment?

Its operating temperature range is -20°C to +60°C, so it is rated for a fairly broad controlled-temperature range. No IP rating is listed in the provided specs, so outdoor or exposed use should not be assumed from this data alone.

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Mean Well

Mean Well NFM-20-3.3 Power Supply 20W 3.3V 4.5A

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NFM-20-3.3 is the 3.3V output model of this series: rated current 4.5A, rated power 14.85W, typical efficiency 71%.

Features

  • Universal AC input / Full range
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Ultra-miniature size, light weight
  • Cooling by free air convection
  • Medical safety approved (2 x MOPP between primary to secondary)
  • No load power consumption<0.75W
  • 100% full load burn-in test
  • Optional on-board type version available
  • Fixed switching frequency at 90KHz
  • High reliability
  • Suitable for BF application with appropriate system consideration
  • 3 years warranty
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