EMERSON LPT80 Service Manual

Embedded Power for
Business-Critical Continuity

LPT80 Series

80 Watts

Special Features

• Power Factor Correction

• EN61000-3-2 compliant

• Universal input

• 3” x 5” footprint

• Remote sense on outputs 1
(& 2 for LPT81)

• Power fail and remote inhibit

• Wide range adjustable on
outputs 1 (& 2 for LPT81)

• Built-in Class B EMI filter

• Overvoltage protection

• Overload protection

Total Power: 55 - 85 Watts
Input Voltage: 85-264 Vac

120-370 Vdc

# of Outputs: Tr ip le

Electrical Specifications

Safety

Input

Input ra nge: 85-264 Vac; 120-300 Vdc
Frequency: 47-440 Hz

Inrush current:

<18 A peak @ 115 Vac;
<36 A peak @ 230 Vac,
cold start @ 25 °C

Input current: 1.5 A max. (RMS) @ 115 Vac
Efficiency: 75% typical at full load
EMI filter: FCC Class B conducted

CISPR 22 Class B conducted
EN55022 Class B conducted
VDE 0878 PT3 Class B conducted

Safety ground
leakage current:

<1 mA @ 50/60 Hz, 264 Vac input

Output

Maximum power: 60 W for convection( LPT81, 55 W);

85 W with 30 CFM forced air

Adjustment range: 3.3 V - 5.5 V on outputs one

(and two 1.8 V - 3.5 V for LPT81)
Hold-up time: 20 ms @85 W load, 115 Vac nominal line
Overload protection: Short circuit protection on all outputs.

Case overload protected @ 145% above peak rating

Overvoltage protection: Tracks outputs 1( & 2 for LPT81): 20% to 35% above

output setting

VDE 60950
UL 60950
CSA 60950
NEMKO 60950
AUSTEL 60950
CB Certificate & report
CE Mark LVD

Rev. 05.23.08
LPT80 Series

1 of 3

RoHS

Embedded Power for
Business-Critical Continuity

Ordering Information

Model
Number

Output
Voltage

Minimum
Load

Maximum Load with
Convection Cooling

Maximum
Load with
30CFM
forced Air

Peak Load 1Regulation

2

Ripple P/P
(PARD)

3

LPT81 +3.3 V (1.8 - 3.5 V)

+5 V (3.3 - 5.5 V)
+12 V

0.7 A

0.3 A
0

8.0 A

4.0 A

0.7 A

13 A13 A

1.0 A

15 A
15 A

1.5 A

±2%
±2%
±5%

50 mV
50 mV
120 mV

LPT82 +5 V (3.3 - 5.5 V)

+12 V

-12 V

0.7 A

0.3 A
0

8.0 A

3.0 A

0.7 A

13 A

4.0 A

1.0 A

15 A

4.6 A

1.5 A

±2%
±5%
±5%

50 mV
120 mV
120 mV

LPT83 +5 V (3.3 - 5.5 V)

+15 V

-15 V

0.7 A

0.3 A
0

8.0 A

2.4 A

0.7 A

13 A

3.2 A

0.7 A

15 A

3.7 A
1 A

±2%
±5%
±5%

50 mV
150 mV
150 mV

1. Peak current lasting <30 seconds with a maximum 10% duty cycle.

2. At 25 °C including initial tolerance, line voltage, load currents and output voltages adjusted to factory settings.

3. Peak-to-peak with 20 MHz bandwidth and 10 μF in parallel with a 0.1 μF capacitor at rated line voltage and load
ranges.

4. Minimum loads are required

5. Total current of all outputs can not exceed 21 A.

Rev. 05.23.08
LPT80 Series

2 of 3

Operating temperature: 0° to 50 °C ambient;

derate each output at 2.5% per degree from 50° to 70°C

Temperature coefficient: ±0.4% per °C
Storage temperature: -40° to 85 °C
Electromagnetic

susceptibility: Designed to meet IEC EN61000-4, -2, -3, -4, -5, -6, -8, -11 Level 3
Humidity: Operating; non-condensing 5% to 95%

Vibration: Three orthogonal axes, sweep at 1 oct/min, 5 min. dwell at four

major resonances 0.75 G peak 5 Hz to 500 Hz, operational

MTBF demonstrated: >550,000 hours at full load and 25 °C ambient conditions

Environmental Specifications

Logic Control

Power failure

TTL logic signal goes high 100 - 500 msec after V1 output; It
goes low at least 4 msec before loss of regulation

Remote inhibit Requires contact closure to inhibit outputs

Remote sense

Compensates for 0.5 V lead drop min. Will operate without
remote sense connected. Reverse connection protected.