MEAN WELL AD-155B is a power supply with battery charger with 27.6 V / 27.1 V channels and a total rated output of 151.55 W. The main load and battery-charging channel have distinct current limits. Apply the specified cooling and load limits.
Product Datasheet
Download MEAN WELL AD-155 Datasheet (PDF)
The AD-155 section is on PDF pages 21, 22. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Architecture
| Complete order code |
AD-155B |
| Series |
AD-155 |
| Output arrangement |
Power Supply with Battery Charger |
| Input selection |
Universal AC input; no manual range-selection switch |
CH1 supplies the DC load and CH2 charges an external battery for the catalogue UPS function. The charging channel is not a second independently regulated load supply.
Use the complete order code to select the voltage combination. The channel numbers identify circuits within one power supply, not separate products.
Electrical Output Ratings
| Total rated output power |
151.55 W |
| CH1 voltage adjustment |
24–29 V |
| CH1 function |
Main regulated output |
| CH1 output voltage |
27.6 V |
| CH1 rated current |
5 A |
| CH1 current range |
0–5.5 A |
| CH1 ripple and noise maximum |
150 mVp-p |
| CH1 voltage tolerance |
±1% |
| CH1 line regulation |
±0.5% |
| CH1 load regulation |
±0.5% |
| CH2 function |
Battery-charging output |
| CH2 output voltage |
27.1 V |
| CH2 rated current |
0.5 A |
| CH2 current range |
0–0.5 A |
The total rated power is shared by all listed channels. Observe the total-power, individual-current, adjustment and cooling limits together; the maximum values of different current ranges are not a simultaneous-output guarantee.
CH1 adjustment does not establish an independently adjustable voltage range for the other channels. Check the connected load and, where used, the battery charging requirements before adjustment.
Voltage tolerance includes setting tolerance, line regulation and load regulation. Ripple/noise is measured at 20 MHz bandwidth using a 12-inch twisted-pair lead terminated with 0.1 µF and 47 µF capacitors in parallel.
Unlisted battery-channel ripple, regulation or current-range values are not specified as zero.
Input and Timing
| AC input voltage |
88–264 VAC |
| DC input voltage |
124–370 VDC |
| AC input frequency |
47–63 Hz |
| Typical efficiency |
84% |
| Typical AC input current |
2.5 A at 115 VAC; 1.5 A at 230 VAC |
| Typical cold-start inrush current |
23 A at 115 VAC; 45 A at 230 VAC |
| Leakage current |
<1 mA at 240 VAC |
| Set-up / rise time |
1000 / 90 ms at 230 VAC; 2000 / 90 ms at 115 VAC, full load |
| Typical hold-up time |
24 ms at 230 VAC; 20 ms at 115 VAC, full load |
| Switching frequency |
PFC 67 kHz; PWM 134 kHz |
| Typical power factor |
>0.92 at full load |
Unless otherwise stated, catalogue parameters are measured at 230 VAC input, rated load and 25°C ambient. Timing values retain their stated input and load conditions.
Active PFC is built in. Connect the protective-earth terminal marked FG as shown in the wiring drawing.
Protection and Battery Operation
| Short-circuit protection |
Provided |
| Main-output overload threshold |
105–135% of rated output power |
| Overload recovery |
AC charging mode: constant-current limiting with automatic recovery after fault removal; UPS mode: internal-fuse protection |
| CH1 over-voltage threshold |
31.74–37.26 V |
| Over-voltage recovery |
Output shutdown; reapply power to recover |
| Battery-low protection |
19.5 V (+1.5 V / −1 V) |
| Battery-polarity protection |
Provided |
| CH2 overload threshold |
0.51–0.9 A |
The over-voltage threshold is specified for CH1. It is not a separately guaranteed over-voltage threshold for every auxiliary or charging channel.
AC charging and battery-backup operation have different overload protection mechanisms. An internal-fuse response is not an automatic electronic restart. Check battery polarity and the battery manufacturer’s charging requirements before connection.
Terminal Assignments and Mating Parts
| Terminal 1 |
AC/L |
| Terminal 2 |
AC/N |
| Terminal 3 |
FG |
| Terminal 4 |
NC |
| Terminal 5 |
BAT. + |
| Terminal 6 |
BAT.−/COM |
| Terminal 7 |
DC OUTPUT COM |
| Terminal 8 |
DC OUTPUT +V |
| CN1 function, pins 1 and 2 |
RESET SW |
| CN1 board connector |
JST B2B-XH or equivalent |
| CN1 mating housing series |
JST XHP or equivalent |
| CN1 contact |
JST SXH-001T-P0.6 or equivalent |
Use the numbered terminal view for this exact series. NC means no connection. DC COM is the output return; FG is protective earth. Do not interchange them.
Connect the external battery only to BAT.+ and BAT.−/COM. The battery return and output common are identified in the terminal and block diagrams. Select wiring and battery protection for the actual installation.
CN1 is the reset-switch connection. Select a mating XHP housing for the illustrated two-position connector and the specified contact. Confirm reset-switch operation for the supplied unit before using the interface.
Environment, Cooling and Derating
| Working ambient temperature |
−10 to +60°C, subject to the applicable cooling curve |
| Working humidity |
20–90% RH, non-condensing |
| Storage temperature |
−20 to +85°C |
| Storage humidity |
10–95% RH |
| Temperature coefficient |
±0.03%/°C from 0 to 50°C |
| Vibration |
10–500 Hz, 2G; 10 minutes/cycle, 60 minutes each along X, Y and Z |
For horizontal mounting without a fan, the curve permits 70% load from −10 to 50°C, decreasing to 50% at 60°C. With at least 21.6 CFM external airflow arranged 10 cm from the unit as shown, it permits 100% from −10 to 50°C and 80% at 60°C.
Natural-convection operation does not mean unrestricted full rated power. Provide the specified external airflow when using the forced-air curve, and keep the ventilation path clear.
Above 2000 m altitude, apply an additional ambient-temperature derating of 3.5°C per 1000 m for fanless models or 5°C per 1000 m for fan models, as specified in the catalogue installation note.
Safety, EMC and Reliability
| Safety standards |
UL 62368-1; TÜV BS EN/EN 62368-1; AS/NZS 62368.1; EAC TP TC 004 approved |
| Input-to-output withstand voltage |
3 kVAC |
| Input-to-FG withstand voltage |
2 kVAC |
| Output-to-FG withstand voltage |
0.5 kVAC |
| Isolation resistance |
100 MΩ between I/P–O/P, I/P–FG and O/P–FG at 500 VDC, 25°C, 70% RH |
| EMC emission |
BS EN/EN 55032 (CISPR 32), Class B; BS EN/EN 61000-3-2 and -3; EAC TP TC 020 |
| EMC immunity |
BS EN/EN 61000-4-2, -3, -4, -5, -6, -8, -11; BS EN/EN 55035, light-industry level; EAC TP TC 020 |
| MTBF, Telcordia SR-332 |
1818.3K hours minimum |
| MTBF, MIL-HDBK-217F |
229.9K hours minimum at 25°C |
This power supply is a component for installation in final equipment. The catalogue EMC tests use a 360 × 360 mm metal plate, 1 mm thick. Verify EMC compliance again in the completed equipment.
The catalogue lists 100% full-load burn-in testing and a two-year warranty. MTBF is a reliability calculation, not a guaranteed operating lifetime.
Mechanical Installation and Related Equipment
| Catalogue dimensions |
199 × 110 × 50 mm (L × W × H) |
| Case reference |
906 |
| Drawing dimensional tolerance |
±1 mm |
| Catalogue unit-weight reference |
880 g |
| Catalogue packing |
0.88 kg; 16 pcs / 15 kg / 0.95 CUFT |
The mechanical drawing marks 192 mm and 172 mm longitudinal references, a 97 mm vertical reference, 5-M3 bottom holes, 3-M3 side holes and Ø3.5 mm holes. Use the exact drawing positions and keep clearance around the terminal block.
The unit weight is the catalogue PACKING reference per unit, not a measured net or shipping weight. Carton quantities and carton weight are separate packing references.
Select external wiring, ventilation and installation hardware to suit the actual load and enclosure. The cooling fan illustrated in the airflow setup is external; the drawing does not establish an included fan or a separate fan order code.
The specified JST board connector, mating housing series and contact are connection references. Confirm the complete mating housing and wire assembly before ordering installation parts.
An external battery is required for backup operation. Choose it for the stated charging voltage and current and the required backup duration; the catalogue does not prescribe a complete battery order code or guarantee a backup time.
