For assistance or to order, call
(800) 531-5782
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
20
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
30 WATT POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
P T 3 3 0 0
S e r i e s
Standard Application
Cin = Optional 100F/100V electrolytic
Cout = Required 330F electrolytic
Note: Pins 4,5,6 and pins 10,11,12,13 are
connected internally.
Ordering Information
PT3301
o = +3.3 Volts
PT3302
o = +5.0 Volts
PT3303
o = +12.0 Volts
PT3304
o = +15.0 Volts
PT3300
7-9
4-6
14-17
V
IN
V
IN
GND
V
O
C
OUT
+
C
IN
+
19
REMOTE SENSE
10-13
2
LOAD
V
O
Adjust
3
V
O
GND
Inhibit
30W Output Power
Input Voltage Range:
20V to 60V
High Efficiency
V
o
Inhibit
V
o
Adjust
Remote Sense
Current Limit
Short-Circuit Protection
Over-Temperature Shutdown
19-pin SIP Package
Features
Pin-Out Information
Pin
Function
1
Do Not Use
2
Inhibit
3
V
o
Adjust
4
V
in
GND
5
V
in
GND
6
V
in
GND
7
V
in
8
V
in
9
V
in
10
V
o
GND
11
V
o
GND
12
V
o
GND
13
V
o
GND
14
V
o
15
V
o
16
V
o
17
V
o
18
Do Not Use
19
Remote Sense
The PT3300 is a new series of high-
input voltage, 30 Watt, non-isolated
Integrated Switching Regulators (ISRs)
housed in a 19-pin SIP package. The 20
to 60 V input range allows easy integra-
tion into many distributed power
applications which utilize 24, 28, or 48V
bus architechures.
The PT3300 series is available with
3.3, 5, 12, or 15V outputs. The output
voltage is adjustable from 90 to 110% of
nominal with the addition of an external
resistor. Other easy to use features include
an inhibit function and remote sense
which automatically compensates for any
voltage drop from the ISR to the load. As
with other Power Trends' products, the
PT3300 includes built in current limit,
short circuit protection and over-tempera-
ture shutdown.
The PT3300 requires a 330F output
capacitor for proper operation.
(For dimensions and PC
board layout, see Package
Styles 820 and 830.)
PT Series Suffix
(PT1234
X
)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
Specifications
Characteristics
PT3300 SERIES
(T
a
= 25C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
I
o
Over V
in
range
V
o
= +3.3V
0.50*
--
8.0
A
V
o
= +5.0V
0.50*
--
6.0
A
V
o
= +12.0V
0.25*
--
2.5
A
V
o
= +15.0V
0.20*
--
2.0
A
Short Circuit Current
I
sc
V
in
= +25V
--
2
I
max
--
--
Input Voltage Range
V
in
0.5
I
o
I
max
20
--
60
V
Output Voltage Tolerance
V
o
Over V
in
range, I
o
= I
max
--
1
3
%V
o
0C
T
a
+60C
Line Regulation
Reg
line
Over V
in
range
--
0.5
1
%V
o
Load Regulation
Reg
load
0.5
I
o
I
max
--
0.5
1
%V
o
V
o
Adjust Range
V
o adj
Over V
in
and I
o
ranges
90
--
110
%V
o
V
o
Ripple/Noise
V
n
V
in
= +24V, I
o
= I
max
--
2
3
%V
o
Transient Response
t
tr
25% load change
--
100
250
Sec
with C
out
= 330F
V
os
V
o
over/undershoot
--
2
5
%V
o
Efficiency
V
in
= +24V, I
o
= 0.5
I
max
V
o
= +3.3V
--
80
--
%
V
o
= +5.0V
--
85
--
%
V
o
= +12.0V
--
87
--
%
Switching Frequency
o
Over V
in
and I
o
ranges
600
750
900
kHz
Absolute Maximum
T
a
-20
--
+85
C
Operating Temperature Range
Recommended Operating
T
a
Free air convection
-20
--
+65**
C
Temperature Range
Over V
in
and
I
o
ranges
Storage Temperature
T
s
--
-40
--
+125
C
Mechanical Shock
--
Per Mil-STD-883D, Method 2002.3
--
500
--
G's
Mechanical Vibration
--
Per Mil-STD-883D, Method 2007.2,
--
10
--
G's
20-2000 Hz, soldered in a PC board
Weight
--
--
--
35
--
grams
*ISR will operate down to no load with reduced specifications. ** See Thermal Derating Curve
Note: The PT3300 Series requires a 330F electrolytic or tantalum output capacitor for proper operation in all applications.
For assistance or to order, call
(800) 531-5782
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
21
W
ide Input Range Pr
oducts
DA
T
A
SHEETS
C H A R A C T E R I S T I C D A T A
PT3301, 3.3 VDC
(See Note 1)
PT3302, 5.0 VDC
(See Note 1)
Efficiency vs Output Current
Efficiency vs Output Current
Ripple vs Output Current
Ripple vs Output Current
Power Dissipation vs Output Current
Power Dissipation vs Output Current
Efficiency %
Output Current (Amps)
Ripple (mV)
Output Current (Amps)
Efficiency %
Output Current (Amps)
Ripple (mV)
Output Current (Amps)
Output Current (Amps)
Pd (Watts)
Pd (Watts)
Output Current (Amps)
Note 1:
All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25C. This data is considered typical data for the DC-DC converter.
Note 2:
Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)
P T 3 3 0 0
S e r i e s
4 0
5 0
6 0
7 0
8 0
9 0
10 0
0
1
2
3
4
5
6
7
8
20.0V
24.0V
30.0V
36.0V
48.0V
60.0V
Vin
0
20
40
60
80
100
0
1
2
3
4
5
6
7
8
60.0V
48.0V
36.0V
30.0V
24.0V
20.0V
Vin
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
60.0V
48.0V
36.0V
30.0V
24.0V
20.0V
Vin
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
2 0
2 5
3 0
3 5
4 0
4 5
5 0
5 5
6 0
Thermal Derating (T
a
)
(See Note 2)
Iout-(Amps)
Vin-(Volts)
85C
40
50
60
70
80
90
100
0
1
2
3
4
5
6
20.0V
24.0V
30.0V
36.0V
48.0V
60.0V
Vin
0
10
20
30
40
50
60
0
1
2
3
4
5
6
60.0V
48.0V
36.0V
30.0V
24.0V
20.0V
Vin
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
60.0V
48.0V
36.0V
30.0V
24.0V
20.0V
Vin
For assistance or to order, call
(800) 531-5782
3
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
A p p l i c a t i o n
N o t e s
PT3300 Series
More Applcation Notes
pt5040
Adjusting the Output Voltage of the
PT3300 Wide Input Range Switching Regulator
The output voltage of the Power Trends PT3300 Series ISRs
may be adjusted over a 10% range from the factory trimmed
pre-set voltage. This is accomplished with the addition of a
single external resistor. Table 1 accordingly gives the allowable
adjustment range for each model in the series as V
a
(min) and
V
a
(max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 3 (V
o
adjust) and pins 10-13
(V
o
GND)
Adjust Down:
Add a resistor
(R1)
, between pin 3 (V
o
adjust)
and pins 14-17 (V
out
).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either
(R1)
or R2 as appropriate.
Notes:
1. Use only a single 1% resistor in either the
(R1)
or R2 loca-
tion. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
o
adjust to either GND or
V
out
. Any capacitance added to the V
o
adjust pin will affect
the stability of the ISR.
3. V
in
GND and V
o
GND are connected internally and may
be treated as common on the PT3300 ISR series.
4. If the Remote Sense feature is being used, connecting the
resistor
(R1)
between pin 3 (V
o
adjust) and pin 19 (Remote
Sense) can benifit load regulation.
5. Adjusting V
out
higher than that defined for the model raises
the minimum input voltage by the same percentage.
Figure 1
The values of
(R1)
[adjust down], and R2 [adjust up], can also be
calculated using the following formulae.
R
o
(V
o
1)(V
a
1)
(R1)
=
(V
o
V
a)
- 0.48
k
R
o
(V
o
1)
R2
=
Va - V
o
- 0.48
k
Where:
V
o
= Original output voltage
V
a
= Adjustd output voltage
R
o
= The value in Table 1
Table 2
PT3300 ADJUSTMENT RESISTOR VALUES
Series Pt #
PT3301
PT3302
PT3303
PT3304
Current
8Adc
6Adc
2.5Adc
2Adc
V
o
(nom)
3.3Vdc
5.0Vdc
12.0Vdc
15.0Vdc
V
a
(req'd)
3.0
(363.0)k
3.1
(572.0)k
3.2
(1200.0)k
3.3
3.4
545.0k
3.5
272.0k
3.6
181.0k
4.5
(383.0)k
4.6
(493.0)k
4.7
(675.0)k
4.8
(1040.0)k
4.9
(2140.0)k
5.0
5.1
548.0k
5.2
274.0k
5.3
182.0k
5.4
137.0k
5.5
109.0k
10.8
(448.0)k
11.0
(548.0)k
11.2
(699.0)k
11.4
(951.0)k
11.6
(1450.0)k
12.0
12.2
274.0k
12.4
137.0k
12.6
91.0k
12.8
68.1k
13.0
54.4k
13.2
45.3k
13.5
(425.0)k
14.0
(664.0)k
14.5
(1379.0)k
15.0
15.5
102.0k
16.0
50.6k
16.5
33.6k
R1 =
(Red)
R2 = Black
(R1)
Adj Down
R 2
Adjust Up
C
out
3 3 0
F
+
V
out
C O M
V
in
C O M
C
in
1 0 0
F,
1 0 0 V
(Optional)
+
P T 3 3 0 0
3
4, 5, 6
7 , 8 , 9
V i n
V o
V i n G N D
Vo(adj)
I N H
2
V o ( S e n s e )
1 9
1 0 - 1 3
V o G N D
1 4 - 1 7
L
O
A
D
Table 1
PT3300 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT3301
PT3302
PT3303
PT3304
Vo (nom)
3.3V
5.5V
12.0V
15.0V
Va (min)
3.0V
4.5V
10.8V
13.5V
Va (max)
3.6V
5.5V
13.2V
16.5Vs
Ro (k
)
23.7
13.7
4.99
3.65
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