For assistance or to order, call (800) 531-5782
Revised 5/19/99
P T 3 3 2 0 S e r i e s
Application Notes
Mechanical Outline
Product Selector Guide
30 WATT ISOLATED
DC/DC CONVERTER
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.
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 series is available with
output voltages from 2V to 15V. The
output voltage is adjustable from 90 to
The PT3320 requires a 330µF output
capacitor for proper operation.
Patent pending*
Pin-Out Information
Features
Pin Function
Pin Function
Standard Application
• 30W Output Power
• Input Voltage Range:
36V to 75V
VO Adjust
1
2
3
4
5
6
7
8
9
Do Not Use
Inhibit
Do Not Use
-Vin
10 -Vo
11 -Vo
12 -Vo
13 -Remote Sense
14 +Vo
+REMOTE SENSE
18
19
+VIN
7-9
2
+VO
• 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
14-17
PT3320
+
+
-Vin
4-6
13 10-12
COUT
LOAD
CIN
-Vin
+Vin
15 +Vo
Inhibit
-VIN
-VO
-REMOTE SENSE
Q1
16 +Vo
17 +Vo
+Vin
+Vin
C
C
= Optional 100µF/100V electrolytic
= Required 330µF electrolytic
in
out
18 Vo Adjust
19 +Remote Sense
Q1 = NFET
Preliminary Specifications
PT3320 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Over Vin range
Min
Typ
Max
Units
Output Current
Io
Vo = 3.3V
0.25
0.25
0.1
—
—
—
8.0
6.0
2.5
A
A
A
• Meets EN60950
V
o = 5V
Vo = 12V
On/Off Standby Current
Short Circuit Current
Input Voltage Range
Iin standby
Isc
Vin = 48V, Pin 1 = -Vin
Vin = 48V
—
8
16
mA
A
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
—
2xIomax
48.0
—
Vin
Over Io Range
36.0
75.0
V
Output Voltage Tolerance ∆Vo
Over Vin Range
—
1.0
—
%Vo
TA= -40°C to +85°C
Line Regulation
Load Regulation
Vo Ripple/Noise
Regline
Over Vin range @ max Io
10% to 100% of Io max
—
—
0.5
0.5
—
—
%Vo
%Vo
Regload
Vn
Vin=48V, Io=Io max, Vo>5V
Vin=48V, Io=Io max, Vo<5V
—
—
1.0
50
—
—
%Vo
mVpp
Transient Response
Efficiency
ttr
50% load change, 1A/µSec
Vo over/undershoot, Vo>5V
—
—
100
3.0
—
—
µSec
%Vo
η
Vin=48V, Io=6A, Vo=3.3V
Vin=48V, Io=6A, Vo=5V
Vin=48V, Io=2.5A, Vo=12V
—
—
—
80
84
85
—
—
—
%
%
%
PT Series Suffix
(PT1234X)
Switching Frequency
ƒo
Over Vin and Io
Vo<10V
Vo>10V
600
400
750
500
900
600
kHz
kHz
Case/Pin
Configuration
Recommended Operating Ta
Temperature Range
Vin = 48V @ max Io
Airflow = 200 LFM
Vertical Through-Hole
N
-40*
-40
—
—
+85
+125
—
°C
°C
G’s
Horizontal Through-Hole
Horizontal Surface Mount
A
C
Storage Temperature
Mechanical Shock
Ts
—
—
—
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
500
(For dimensions and PC board layout,
see Package Styles 840 and 850.)
Mechanical Vibration
—
Per Mil-Std-883D, method 2007.2,
20-2000Hz, soldered in a PC board
—
—
10
40
—
—
G’s
Weight
—
—
grams
* Note: This product is the
subject of one or more patents.
Other patents pending.
Input/Output Isolation
Capacitance
—
—
—
—
—
—
1500
—
—
—
—
—
VDC
pF
1200
—
Resistance
10
MΩ
Flammability
Inhibit (pin 2)
—
Materials meet UL 94V-0
On**
Off
2.5
0
—
—
15
VDC
VDC
Referenced to -Vin
0.8
* 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.
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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