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PT4520 Series
20-W 48-V Input Isolated
DC/DC Converter
Specifications
(Unless otherwise stated, T
a
=25°C, V
in
=48V, C
out
=0μF, and I
o
=I
o
max)
PT4520 SERIES
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
Output Current
I
o
Over V
in
range
V
o
= 15V
V
o
= 12V
V
o
=5.0V
V
o
≤
3.3V
0.1
(1)
0.1
(1)
0.1
(1)
0.1
(1)
36
—
—
—
—
—
—
—
—
48
±1
±0.5
±0.2
±0.4
1.3
1.6
4
5
75
±1.5
(2)
—
±1
±1
A
Input Voltage Range
Set-Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
V
in
V
o
tol
Reg
temp
Reg
line
Reg
load
V
o
tot
Over I
o
Range
VDC
%V
o
%V
o
%V
o
%V
o
–40°
≤
T
a
≤
+85°C, I
o
=I
o
min
Over V
in
range
Over I
o
range
Includes set-point, line, load,
–40°
≤
T
a
≤
+85°C
(2)
—
±2
±3
(2)
%V
o
Efficiency
η
V
o
= 15V
V
o
= 12V
V
o
=5.0V
V
o
=3.3V
V
o
=1.8V
V
o
=1.5V
V
o
=1.2V
V
o
≥
5.0V
V
o
≤
3.3V
—
—
—
—
—
—
—
—
—
—
—
—
—
—
600
800
—
86
83
82
78
67
65
59
0.5
15
100
±3
±150
200
±10
650
850
31
—
—
—
—
—
—
—
—
—
—
—
—
—
—
700
900
—
%
V
o
Ripple (pk-pk)
V
r
20MHz bandwidth
%V
o
mV
pp
μs
%V
o
mV
%I
o
max
%
Transient Response
t
tr
0.1A/μs load step, 50% to 100% I
o
max
V
o
over/undershoot
V
tr
V
o
≥
5.0V
V
o
≤
3.3V
Current Limit Threshold
Output Voltage Adjust
Switching Frequency
I
lim
V
o
adj
s
V
in
=36V,
V
o
= –50mV
Over V
in
range
V
o
≥
5.0V
V
o
≤
3.3V
kHz
Under-Voltage Lockout
Remote On/Off (Pin 1)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
UVLO
V
Referenced to –V
in
(pin 2)
V
IH
V
IL
I
IL
I
in
standby
C
in
C
out
2.5
–0.2
—
—
—
0
1500
—
10
–40
—
–40
—
—
–10
7
0.5
—
—
1100
—
—
—
—
Open
(3)
0.8
–
10
—
220
(4)
—
—
—
85
(5)
215
(6)
125
V
μA
mA
μF
μF
V
pF
M
°C
°C
°C
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Isolation Voltage
Capacitance
Resistance
Operating Temperature Range
Solder Reflow Temperature
Storage Temperature
Reliability
pins 1 & 2 connected
Input–output/input–case
Input to output
Input to output
Over V
in
range
Surface temperature of module pins or case
—
Per Bellcore TR-332
50% stress, T
a
=40°C, ground benign
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
Mil-Std-883D, method 2007.2,
20-2000Hz , soldered
—
Materials meet UL 94V-0
T
a
T
reflow
T
s
MTBF
4
—
—
10
6
Hrs
Mechanical Shock
—
—
500
—
G’s
Mechanical Vibration
—
Suffix N
—
—
—
20
(7)
20
(7)
23
—
—
—
G’s
Suffixes A & C
Weight
Flammability
Notes:
(1) The DC/DC converter will operate at no load with reduced specifications.
(2) For optimum voltage accuracy the ‘Remote Sense (+)’ and ‘Remote Sense (–)’ pins must be connected to +V
and –V
respectively.
(3) The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the PT4520 will operate when input power is applied. Refer to the
application notes for interface considerations.
(4) External output capacitance is not required for proper operation. Capacitamce may be added to improve the response to load transients. The maximum
total capacitance (including the load circuit) must not exceed 220μF, and the combined ESR of must not be less than 100m
.
(5) See Safe Operating Area curves or contact the factory for the appropriate derating.
(6) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).
(7) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
—
—
grams
SLTS148B - JUNE 2000 - REVISED OCTOBER 2002