Tyco Electronics Corp.
3
Data Sheet
November 2001
36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W
LUW025-Series Power Modules: dc-dc Converters:
Electrical Specifications (continued)
Table 2. Output Specifications
Table 3. Isolation Specifications
Parameter
Device
Suffix
Symbol
Min
Typ
Max
Unit
Output Voltage Set Point
(VI = 48 V; IO = IO, max; Tref = 25 °C)
F
A
VO, set
3.25
4.92
3.30
5.00
3.35
5.08
Vdc
Output Voltage
(Over all operating input voltage, resistive
load, and temperature conditions until end of
F
A
VO
3.16
4.85
—
3.44
5.15
Vdc
Output Regulation:
Line (VI = 36 V to 75 V)
Load (IO = IO, min to IO, max)
Temperature
(Tref = –40 °C to +110 °C)
All
—
0.05
0.5
0.2
1.0
%VO
Output Ripple and Noise Voltage:
(VI = 48 V; IO = IO, max; temperature = –25 °C to
+100 °C; see Figure
11.):
RMS (5 Hz to 20 MHz bandwidth)
Peak-to-peak (5 Hz to 20 MHz bandwidth)
All
F
A
—
30
50
40
100
mVrms
mVp-p
External Load Capacitance
(total capacitance; electrolytic, tantalum, and
ceramic)
All
—
0
—
470
F
Output Current
(At IO < IO, min, the modules may exceed output
ripple specifications.)
All
IO
0.4
—
5.0
A
Output Current-limit Inception
(VO = 90% of VO, nom)
All
IO, cli
5.15
—
7.5
A
Efficiency
(VI = 48 V; IO = IO, max; Tref = 25 °C; see Figures
VO = 3.3 V
Trimmed down to 1.8 V
VO = 5 V
Trimmed down to 3.3 V
F
A
η
76
65
77
70
78
67
79
72
—
%
Switching Frequency
All
—
295
—
kHz
Dynamic Response
(
IO/t = 1A/10 s; VI = 48 V; Tref = 25 °C;
Load Change from IO = 50% to 75% of IO, max:
Peak Deviation
Settling Time (VO < 10% of peak deviation)
Load Change from IO = 50% to 25% of IO, max:
Peak Deviation
Settling Time (VO < 10% of peak deviation)
All
—
50
1
50
1
—
mV
ms
mV
ms
Parameter
Min
Typ
Max
Unit
Isolation Capacitance
—
2
—
nF
Isolation Resistance (250 Vdc)
10
—
M