
PT3320
30 WATT ISOLATED
DC/DC CONVERTER
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Series
For assistance or to order, call (800) 531-5782
Standard Application
Cin = Optional 100F/100V electrolytic
Cout = Required 330F electrolytic
Q
1
= NFET
PT3320
7-9
4-6
14-17
+V
IN
-V
IN
+V
O
C
OUT
+
C
IN
+
19
+REMOTE SENSE
10-12
2
LOAD
18
-V
O
13
Q
1
-REMOTE SENSE
Inhibit
V
O Adjust
30W Output Power
Input Voltage Range:
36V to 75V
1500 VDC Isolation
Vo Inhibit
Vo Adjust
Differential Remote Sense
Current Limit
Short-Circuit Protection
Over-Temperature Shutdown
Undervoltage Lockout
Flexibile SIP Package
UL 1950, CSA 22.2 950
approval pending
Meets EN60950
Features
The PT3320 is a new series of high-
input voltage, 30 Watt, isolated DC to
DC converters housed in a unique
vertical or horizontal 19-pin SIP pack-
age. The 36 to 75V input range allows
easy integration into many distributed
power applications which utilize 48V bus
architectures.
The PT3320 series is available with
output voltages from 2V to 15V. 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
differential remote sense which auto-
matically compensates for any voltage
drop from the converter to the load. The
PT3320 includes built in current limit,
short circuit protection and over-
temperature shutdown.
The PT3320 requires a 330F output
capacitor for proper operation.
(For dimensions and PC board layout,
see Package Styles 840 and 850.)
PT Series Suffix (PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
Ordering Information
PT3321
¨ = 3.3V/8A
PT3322
¨ = 5.0V/6A
PT3323
¨ = 12.0V/2.5A
PT3324
¨ = 15.0V/2A
PT3325
¨ = 2.0V/8A
PT3326
¨ = 2.5V/8A
PT3327
¨ = 1.8V/8A
PT3328
¨ = 5.2V/6A
Preliminary Specifications
Characteristics
PT3320 SERIES
(T
a = 25
°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
Vo = 3.3V
0.25
—
8.0
A
Vo = 5V
0.25
—
6.0
A
Vo = 12V
0.1
—
2.5
A
On/Off Standby Current
Iin standby
Vin = 48V, Pin 1 = -Vin
—8
16
mA
Short Circuit Current
Isc
Vin = 48V
—
2xIomax
—A
Input Voltage Range
Vin
Over Io Range
36.0
48.0
75.0
V
Output Voltage Tolerance
Vo
Over Vin Range
TA= -40°C to +85°C
—
±1.0
—
%Vo
Line Regulation
Regline
Over Vin range @ max Io
—
±0.5
—
%Vo
Load Regulation
Regload
10% to 100% of Io max
—
±0.5
—
%Vo
Vo Ripple/Noise
Vn
Vin=48V, Io=Io max, Vo>5V
—
1.0
—
%Vo
Vin=48V, Io=Io max, Vo<5V
—
50
—
mVpp
Transient Response
ttr
50% load change, 1A/Sec
—
100
—
Sec
Vo over/undershoot, Vo>5V
—
3.0
—
%Vo
Efficiency
η
Vin=48V, Io=6A, Vo=3.3V
—
80
—
%
Vin=48V, Io=6A, Vo=5V
—
84
—
%
Vin=48V, Io=2.5A, Vo=12V
—
85
—
%
Switching Frequency
o
Over Vin and Io
Vo<10V
600
750
900
kHz
Vo>10V
400
500
600
kHz
Recommended Operating
Ta
Vin = 48V @ max Io
-40*
—
+85
°C
Temperature Range
Airflow = 200 LFM
Storage Temperature
Ts
—
-40
—
+125
°C
Mechanical Shock
—
Per Mil-Std-883D, method 2002.3,
—
500
—
G’s
1mS, half-sine, mounted to a fixture
Mechanical Vibration
—
Per Mil-Std-883D, method 2007.2,
—10
—
G’s
20-2000Hz, soldered in a PC board
Weight
—
40
—
grams
Input/Output Isolation
—
1500
—
VDC
Capacitance
—
1200
—
pF
Resistance
—
10
—
M
Flammability
—
Materials meet UL 94V-0
Inhibit (pin 2)
On**
Referenced to -Vin
2.5
—
15
VDC
Off
0
—
0.8
VDC
* At temperatures below 0°C, the PT3320 series requires output capacitors with temperature stable dielectrics
such as tantalum or Oscon.
** If pin 2 is left open, the PT3320 will operate when input power is applied.
Pin-Out Information
Pin Function
1
Do Not Use
2
Inhibit
3
Do Not Use
4-Vin
5-Vin
6-Vin
7+Vin
8+Vin
9+Vin
Pin Function
10
-Vo
11
-Vo
12
-Vo
13
-Remote Sense
14
+Vo
15
+Vo
16
+Vo
17
+Vo
18
Vo Adjust
19
+Remote Sense
* Note:
This product is the
subject of one or more patents.
Other patents pending.
Patent pending*
New 30W
Isolated
SIPs
Revised 5/19/99