For assistance or to order, call (800) 531-5782
Revised 5/19/99
P T 3 3 4 0 S e r i e s
Application Notes
Mechanical Outline
Product Selector Guide
30 WATT ISOLATED
DC/DC CONVERTER
The PT3340 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 18 to 60V input range allows
easy integration into many distributed
power applications which utilize 24V bus
architectures.
110% of nominal with the addition of an
external resistor. Other easy to use
features include an inhibit function and a
differential remote sense which auto-
matically compensates for any voltage
drop from the converter to the load. The
PT3340 includes built in current limit,
short circuit protection and over-
temperature shutdown.
The PT3340 series is available with
output voltages from 3.3V to 15V. The
output voltage is adjustable from 90 to
The PT3340 requires a 330µF output
capacitor for proper operation.
Patent pending*
Pin-Out Information
Features
Standard Application
Pin Function
Pin Function
• 30W Output Power
• Input Voltage Range:
18V to 60V
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
+VO
14-17
• 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
PT3340
2
+
+
-Vin
-Vin
4-6
13 10-12
COUT
LOAD
CIN
Inhibit
-VIN
15 +Vo
-VO
-REMOTE SENSE
Q1
+Vin
+Vin
16 +Vo
17 +Vo
C
C
Q1
= Optional 100µF/100V electrolytic
= Required 330µF electrolytic
= NFET
in
out
+Vin
18 Vo Adjust
19 +Remote Sense
Preliminary Specifications
PT3340 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Over Vin range
Min
Typ
Max
Units
Output Current
Io
Vo = 3.3V
Vo = 5V
Vo = 12V
0.25
0.25
0.1
—
—
—
8.0
6.0
2.5
A
A
A
• Meets EN60950
On/Off Standby Current
Short Circuit Current
Input Voltage Range
Iin standby
Isc
Vin = 24V, Pin 1 = -Vin
Vin = 24V
—
7
14
mA
A
—
Iomaxx2
24.0
—
Ordering Information
PT3341¨ = 3.3V/8A
PT3342¨ = 5.0V/6A
PT3343¨ = 12.0V/2.5A
PT3344¨ = 15.0V/2A
Vin
Over Io Range
18.0
60.0
V
Output Voltage Tolerance ∆Vo
Over Vin Range
TA= -40°C to +85°C
—
1.0
—
%Vo
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=24V, Io=Io max, Vo>5V
Vin=24V, 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
PT Series Suffix
(PT1234X)
η
Vin=24V, Io=6A, Vo=3.3V
Vin=24V, Io=6A, Vo=5V
Vin=24V, Io=2.5A, Vo=12V
—
—
—
80
82
86
—
—
—
%
%
%
Case/Pin
Configuration
Vertical Through-Hole
N
A
C
Switching Frequency
ƒo
Over Vin and Io
Vo<10V
Vo>10V
600
400
750
500
900
600
kHz
kHz
Horizontal Through-Hole
Horizontal Surface Mount
Recommended Operating Ta
Temperature Range
Vin = 48V @ max Io
Airflow = 200 LFM
-40*
-40
—
—
+85
+125
—
°C
°C
G’s
(For dimensions and PC board layout,
see Package Styles 840 and 850.)
Storage Temperature
Mechanical Shock
Ts
—
—
—
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
500
Mechanical Vibration
—
Per Mil-Std-883D, method 2007.2,
20-2000Hz, soldered in a PC board
—
—
10
40
—
—
G’s
* Note: This product is the
subject of one or more patents.
Other patents pending.
Weight
—
—
grams
Input/Output Isolation
Capacitance
—
—
—
—
—
—
1500
—
—
1200
—
—
—
—
VDC
pF
Resistance
10
MΩ
Flammability
Inhibit (pin 2)
—
Materials meet UL 94V-0
On**
Off
2.5
0
—
—
15
0.8
VDC
VDC
Referenced to -Vin
* At temperatures below 0°C, the PT3340 series requires output capacitors with temperature stable dielectrics
such as tantalum or Oscon.
** If pin 2 is left open, the PT3340 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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