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Mean Well

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

SKU PM-20-3.3
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End of Life, Succeeded by MPM-20-3.3
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Overview

PM-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
  • Low leakage current <300μA
  • Protections: Short circuit / Overload / Over voltage
  • 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
  • Fixed switching frequency at 90KHz
  • High reliability
  • Suitable for BF application with appropriate system consideration
  • 3 years warranty

Specifications

PM-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 TOLERANCENote.3
±3.0%
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 < 300 μA/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

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 (Note 4)

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
94*56*22.7mm (L*W*H)
PACKING
0.18Kg; 90pcs/17.2Kg/0.94CUFT
Test conditions and notes6
  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. Touch current was measured from primary input to DC output.
  6. 6. 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

PM-20-3.3 Block Diagram
Block Diagram
PM-20-3.3 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the PM-20-3.3 for a 3.3V industrial control board or embedded controller?

Yes, this model is a constant voltage 3.3V supply rated for 4.5A. With 14.85W output power, it fits 3.3V industrial control boards, embedded electronics, and automation logic that need a regulated 3.3V rail within that current range.

Is the PM-20-3.3 suitable for powering multiple 3.3V sensors or interface modules in one system?

It can be used where the combined 3.3V load stays within 4.5A and 14.85W. That makes it a practical option for grouped 3.3V sensors, interface cards, and low-voltage embedded modules that share a common constant voltage source.

Can this 3.3V power supply be used in automation cabinets with wide AC input ranges?

Yes, the input range is 85-264VAC, so it is suited to equipment that may be deployed across different AC supply conditions. Its constant voltage 3.3V output is intended for low-voltage automation and embedded loads rather than variable-output applications.

Can I use the PM-20-3.3 in hot or cold indoor equipment environments?

The specified operating temperature range is -20°C to +60°C. No IP rating is listed in the provided specs, so the product data supports temperature suitability but does not state suitability for outdoor exposure or washdown conditions.

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Mean Well

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

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PM-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
  • Low leakage current <300μA
  • Protections: Short circuit / Overload / Over voltage
  • 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
  • Fixed switching frequency at 90KHz
  • High reliability
  • Suitable for BF application with appropriate system consideration
  • 3 years warranty
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