For technical support and more information, see inside back cover or visit www.ti.com
PT3340 Series
30-W 24/48-V Input
Isolated DC/DC Converter
Specifications
Characteristic
Output Current
(Unless otherwise stated, T
a
=25°C, V
in
=24V, C
out
=330µF, and I
o
=I
o
max)
Symbol
I
o
Conditions
Over V
in
range
V
o
= 15V
V
o
= 12V
V
o
=5.0V
V
o
≤
3.3V
V
o
≥5.0V
V
o
≤3.3V
–40°
≤T
a
≤
+85°C
Over V
in
range
Over I
o
range
Includes set-point, line, load,
–40°
≤T
a
≤
+85°C
V
o
≥5.0V
V
o
≤3.3V
Vo
≥5.0V
V
o
≤3.3V
V
o
≥5.0V
V
o
≤3.3V
V
o
= 15V
V
o
= 12V
V
o
=5.0V
V
o
=3.3V
V
o
≥
5.0V
V
o
≤
3.3V
Min
0.1
0.1
0.25
0.25
18.0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
450
700
—
—
(1)
(1)
(1)
(1)
PT3340 SERIES
Typ
Max
—
—
—
—
24.0
±1
±33
±0.5
±0.2
±7
±0.4
±13
±2
±67
85
86
83
80
1.0
50
100
±3.0
±100
2xI
o
max
500
750
17
16
—
—
–6
8
0.66
330
330
—
1200
—
—
—
—
—
500
10
43
2.0
2.5
6.0
8.0
60.0
±1.5
±50
—
±1.0
±33
±1.0
±33
—
—
—
—
—
—
2.0
75
200
±5.0
±150
—
550
800
—
—
15
(2)
+0.8
–10
16
—
600
(3)
1,000
(3)
—
—
—
+85
(5)
100
+125
—
—
—
—
Units
A
V
%V
o
mV
%V
o
%V
o
mV
%V
o
mV
%V
o
mV
%
%V
o
mV
pp
µs
%V
o
mV
A
kHz
V
V
µA
mA
µF
µF
Vdc
pF
MΩ
°C
°C
°C
10
6
Hrs
G’s
G’s
grams
Input Voltage Range
Set Point Voltage T
olerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Efficiency
V
in
V
o
tol
Reg
temp
Reg
line
Reg
load
∆V
o
tot
η
Over I
o
Range
V
o
Ripple (pk-pk)
Transient Response
V
r
t
tr
∆V
tr
20MHz bandwidth
0.1A/µs load step, 50% to 100% I
o
max
V
o
over/undershoot
V
o
≥
5.0V
V
o
≤
3.3V
Over V
in
range
V
in
increasing
V
in
decreasing
Referenced to –V
in
(pins 4–6)
V
o
>10V
V
o
<10V
Short Circuit Current
Switching Frequency
Under-Voltage Lockout
Remote On/Off Input (pin 2)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Isolation Voltage
Capacitance
Resistance
Operating T
emperature Range
Maximum Case T
emperature
Storage T
emperature Range
Reliability
Mechanical Shock
Mechanical Vibration
Weight
Flammability
I
sc
ƒ
s
UVLO
V
IH
V
IL
I
IL
I
in
standby
C
in
C
out
pins 2 & 4 connected
Between +V
o
and –V
o
Input-output/input-case
Input-output
Input-output
Over V
in
range
—
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
Per Mil-Std-883D, method 2007.2,
20-2000Hz, soldered to board
—
Materials meet UL 94V-0
V
o
≥
9V
V
o
≤
5V
T
a
T
c
T
s
MTBF
—
—
—
—
2.5
–0.2
–3
—
—
260
260
1500
—
10
-40
(4)
—
-40
5.0
—
—
—
Notes:
(1) The DC/DC converter will operate at no load with reduced specifications.
(2) The Remote On/Off input has an internal pull-up. If it is left open circuit the module will operate when input power is applied. A low-leakage
(<100nA) MOSFET is recommended to control this input. The open-circuit voltage is less than 10V. See application notes for interface considerations.
(3) Output capacitor values are absolute. Allowances must be made for any additional de-coupling capacitors and the total external capacitor tolerance.
The value of external capacitance is limited due to regulator startup current requirements. Consult the factory for further details.
(4) For operation below 0°C, the required external output capacitor must have temperature stable characteristics. E.g. Tantalum or Oscon® types.
(5) See Safe Operating Area curves or contact the factory for the appropriate thermal derating.
For technical support and more information, see inside back cover or visit www.ti.com
PT3340 Series
30-W 24/48-V Input
Isolated DC/DC Converter
Typical Characteristics
PT3341, 3.3 VDC
(See Note A)
PT3342, 5.0 VDC
(See Note A)
PT3343, 12.0 VDC
(See Note A)
Efficiency vs Output Current
90
90
Efficiency vs Output Current
90
Efficiency vs Output Current
V
IN
V
IN
80
V
IN
80
80
70
18.0V
24.0V
36.0V
48.0V
60.0V
70
18.0V
24.0V
36.0V
48.0V
60.0V
70
18.0V
24.0V
36.0V
48.0V
60.0V
Efficiency - %
Efficiency - %
Efficiency - %
60
60
60
50
0
2
4
6
8
50
0
1
2
3
4
5
6
50
0
0.5
1
1.5
2
2.5
Iout (A)
Iout (A)
Iout (A)
Ripple vs Output Current
50
70
40
Ripple vs Output Current
120
Ripple vs Output Current
V
IN
60.0V
48.0V
36.0V
24.0V
18.0V
Ripple - mV
100
80
60
40
20
0
V
IN
60.0V
48.0V
36.0V
24.0V
18.0V
Ripple - mV
60
50
40
30
20
10
V
IN
60.0V
48.0V
36.0V
24.0V
18.0V
Ripple - mV
30
20
10
0
0
2
4
6
8
0
0
1
2
3
4
5
6
0
0.5
1
1.5
2
2.5
Iout (A)
Iout (A)
Iout (A)
Power Dissipation vs Output Current
10
10
8
Power Dissipation vs Output Current
10
Power Dissipation vs Output Current
V
IN
60.0V
48.0V
36.0V
24.0V
18.0V
Pd - Watts
8
V
IN
18.0V
24.0V
36.0V
48.0V
60.0V
Pd - Watts
8
V
IN
60.0V
48.0V
36.0V
24.0V
18.0V
Pd - Watts
6
6
6
4
4
4
2
2
2
0
0
2
4
6
8
0
0
1
2
3
4
5
6
0
0
0.5
1
1.5
2
2.5
Iout (A)
Iout (A)
Iout (A)
Safe Operating Area (V
in
=24V)
(See Note B)
90
Safe Operating Area (V
in
=24V)
(See Note B)
90
Safe Operating Area (V
in
=24V)
(See Note B)
90
Ambient Temperature (°C)
Ambient Temperature (°C)
Airflow
70
60
50
40
30
20
0
2
4
6
8
Airflow
70
60
50
40
30
20
0
1
2
3
4
5
6
Ambient Temperature (°C)
80
80
80
Airflow
70
60
50
40
30
20
0.0
0.5
1.0
1.5
2.0
2.5
200LFM
120LFM
60LFM
Nat conv
Nat conv
60LFM
120LFM
200LFM
200LFM
120LFM
60LFM
Nat conv
Iout (A)
Iout (A)
Iout (A)
Note A:
All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter.
Note B:
SOA Curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT3320/3340/4560/4580 Series
Adjusting the Output Voltage of Power Trends’
30W Isolated DC/DC Converter Series
The factory pre-set output voltage of Power Trends’ 30W
series of isolated DC/DC converters may be adjusted
within a nominal ±10% range. This is accomplished with
the addition of a single external resistor. For the input
voltage range specified in the data sheet, Table 1 gives the
allowable adjustment range for each model as V
o
(min)
and V
o
(max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor, R
2
between V
o
adjust (pin 18), and
-Remote Sense (pin 13).
See note 4.
Adjust Down:
Add a resistor
(R
1
),
between V
o
adjust (pin
18), and +Remote Sense (pin 19).
Refer to Figure 1 and Tables 2 & 3 for both the placement and
value of the required resistor,
(R
1
)
or R
2
.
Notes:
1. Use only a single 1% resistor in either the
(R
1
)
or R
2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors to V
o
adjust. Any capacitance
added to the V
o
adjust control pin will affect the stability of
the ISR.
Table 1
DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
AL Case:
24V Bus
48V Bus
CU Case:
24V Bus
48V Bus
V
o
(nom)
Vo(min)
Vo(max)
V
r
K
o
(V·kΩ )
Ω
R
s
(kΩ )
Ω
3. If the remote sense pins are not being used, the resistors
(R1)
and R2 can be connected to +V
out
or -V
out
respectively.
4. The adjusted output voltage, V
a
effectively sets the voltage
across pins 13 and 19 (±Remote Sense). When using the
remote sense pins, V
out
(measured directly across pins 10–
12, and 14–17) can be significantly higher than V
a
, and may
exceed V
o
(max). If V
a
is adjusted upward of V
o
(max), the
the minimum input voltage is increased by the same
percentage as V
out
exceeds V
o
(max).
The values of
(R
1
)
[adjust down], and R
2
[adjust up], can
also be calculated using the following formulas.
(R
1
)
=
K
o
(V
a
– V
r
)
V
r
(V
o
– V
a
)
K
o
(V
a
– V
o
)
V
o
V
a
V
r
K
o
R
s
– R
s
kΩ
R
2
Where
=
– R
s
kΩ
= Original output voltage
= Adjusted output voltage
= Reference voltage (Table 1)
= Multiplier constant (T
able 1)
= Series resistance (Table 1)
PT3327
PT4585
PT4567
1.8V
1.62V
2.5V
1.225V
69.58
80.6
1.8V
1.62V
1.98V
1.225V
69.58
80.6
PT3325
PT3326
PT3341
PT3321
PT4581
PT4561
3.3V
2.95V
3.65V
1.225V
68.89
150.0
PT3342
PT3322
PT4582
PT4562
5.0V
4.5V
5.5V
1.225V
68.71
121.0
PT3343
PT3323
PT4583
PT4563
12.0V
10.8V
13.2V
2.5V
135.9
90.9
PT3344
PT3324
PT4584
PT4564
15.0V
13.5V
16.5V
2.5V
137.5
80.6
PT4565
2.0V
1.8V
2.2V
1.225V
62.47
150.0
PT4566
2.5V
2.25V
2.75V
1.225V
42.33
121.0
PT4571
9.0V
7.0V
10.0V
2.5V
133.25
110
Figure 1
2
Remote
On/Off
19
Sns(+)
14 - 17
+ V
in
7, 8, 9
+Vin
30W Isolated
-Vin
4, 5, 6
-Vout
10 - 12
Sns(-)
13
+Vout
+ V
out
Vo(adj)
18
Cin
1 0 0
µF
100V
(Optional)
(R1)
Adj Down
+
Cout
3 3 0µF
R2
Adj
Up
+
L
O
A
D
-V
in
-V
out
For technical support and more information, see inside back cover or visit www.ti.com
