
Embedded Power for
Business-Critical Continuity
LES20B
Eighth-Brick B Series
Single output
Special Features
High efficiency topology
Industry standard eighth-
brick footprint (identical to
quarter-brick pinout)
Low profile through-hole and
surface mount version
38% space savings over
quarter-brick converters
Wide ambient temperature
range, -40 °C to +85 °C
90% to 110% output trim
100 V, 100 ms input voltage
transient rated
Meets basic insulation
requirements of EN60950-1
Industry standard feature
sets: UVLO, OVP, OCP and
OTP
Regulation to zero load
Fixed frequency switching
Fast transient switching
EU directive 2002/95/EC
compliant for RoHS
2 year warranty
Total Power:
Up to 66W
Input Voltage: 33 - 75VDC
# of Outputs:
Single
Safety
UL/cUL60950-1 CAN/CSA 22.2
VDE EN/IEC60950-1
CB Report and Certificate to
IEC60950
Rev.03.19.07
LES20B
1 of 4
Electrical Specifications*
*All specifications are typical at nominal input,
full load at 25 °C ambient unless otherwise stated.
Output
Voltage adjustability
90% to 110%
Minimum load
0%
Overshoot
At turn-on and turn-off
None
Undershoot
At turn-on and turn-off
None
Transient Response
5% Vout typ. deviation
(See Note 1)
40 s recovery
Input
Input voltage range
48 V nominal
36-75 Vdc
Input current
No load
100 mA
Remote OFF
10 mA
Active high remote ON/OFF
Logic compatibility
TTL compatible ref to -input
ON
>2.4 Vdc
OFF
<0.8 Vdc
Undervoltage Lockout
Power up
35 V (typ.)
Power down
32 V (typ.)
Start-up time
Power up
25 ms (typ.)
(See Note 2)
Remote ON/OFF
5 ms (typ.)