Application Notes
Mechanical Outline
For assistance or to order, call (800) 531-5782
Product Selector Guide
S e r i e s
PT42/4300
3-7 WATT 48V INPUT
ISOLATED DC-DC CONVERTER
Revised 5/15/98
• Wide Input Voltage Range:
38V to 72V
• 83% Efficiency
• 1,500 VDC Isolation
• 18 Pin DIP Package
• 3.5 Million Hour MTBF
• Meets FCC/EN55022 Class A
• UL and CSA approved
• No External Components Required
• Adjustable Output Voltage
DC to DC converters advance the state-of-the-
art for board-mounted converters by employing
high switching frequencies, thick-film technology
and a high degree of silicon integration. The high
reliability and very low package height makes
these converters ideal for Telecom and Datacom
applications requiring input-to-output isolation
with board spacing down to 0.6”.
The PT4200 series is offered in a unique
molded through-hole or SMD-DIP package
with single output voltages of 2V, 3.3V, 5V, and
12V, dual outputs of ±5V, +5V/+3.3V, and ±12V.
Power Trends’ PT4200 series of isolated
Standard Application
Pin-Out Information
Pin Function
+Vout1
-Vout
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
+Vin
-Vin
+Vout2 or NC
1
2
Vout1
NC
NC
Vout return
Vadj
NOR
RC
TOA
3
Vout2 or N/C
Do not connect
Do not connect
Do not connect
Do not connect
Vadj
PT42/4300
Specifications
4
PT42/4300 SERIES
5
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
6
Output Current
Io
Over Vin range
Vo = 2V, 3.3V
Vo = 5V
0
0
0
—
—
—
1.5
1.2
0.6
A
A
A
7
8*
Vo = 12V
Nominal output
voltage resistor
Current Limit
Icl
Vin = 48V
Vo = 2V
2.0
1.7
1.4
0.7
—
—
—
—
3.3
3.3
2.4
1.2
A
A
A
A
9*
Vo = 3.3V
Vo = 5V
Turn-on/off input
voltage adjust
10
Vo = 12V
Vin = 48V, Pin 11 = -Vin
11
12
13
14
15
16
17
18
Remote on/off
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
-Vin
On/Off Standby Current
Short Circuit Current
Iin standby
Isc
—
0.5
—
mA
Vin = 48V
Vo = 2V
—
—
—
—
2.8
2.4
1.9
1.2
—
—
—
—
A
A
A
A
V
o = 3.3V
Vo = 5V
Vo = 12V
Inrush Current
Iir
tir
Vin = 48V @ max Io
On start-up
—
—
0.6
1.0
1.0
5.0
A
mSec
Input Voltage Range
Vin
Over Io Range
Over Io Range
Io = 0A
38**
—
48
±4
72
—
V
Output Voltage Tolerance ∆Vo
%Vo
+Vin
Idling Voltage
Vo
Vo = 2V
—
—
—
—
2.7
3.0
4.0
6.0
17
V
V
V
V
* Please note that when the Vout
adjust is not used, pin 8 must be
connected to pin 9.
V
o = 3.3V
3.65
5.6
Vo = 5V
Vo = 12V
14.3
Ripple Rejection
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
RR
Over Vin range @ 120 Hz
Over Vin range @ max Io
10% to 100% of Io max
Vin= 48V, Io=Io max
—
—
—
—
60
—
—
—
70
dB
Ordering Information
Through-Hole
PT4201A = 2V/1.5A
PT4202A = 3.3V/1.5A
PT4203A = 5V/1.2A
PT4204A = 12V/0.6A
PT4301A = ±5V/1A
Regline
Regload
Vn
±0.5
±3
%Vo
%Vo
mVpp
30
ttr
50% load change
—
—
100
3.0
300
5.0
µSec
%Vo
Vo over/undershoot
Efficiency
η
Vin=48V, Io=1.5A, Vo=2V
Vin=48V, Io=1.5A, Vo=3.3V
Vin=48V, Io=1.2A, Vo=5V
Vin=48V, Io=0.6A, Vo=12V
—
—
—
—
73
79
80
83
—
—
—
—
%
%
%
%
PT4302A = +5.2V/1A,
+3.3V/1A
PT4303A = ±12V/0.25A
Switching Frequency
ƒo
Over Vin and Io
—
485
—
kHz
Surface Mount
Operating Temperature
Ta
Vin = 48V @ max Io
-40
—
+85
°C
PT4201C = 2V/1.5A
PT4202C = 3.3V/1.5A
PT4203C = 5V/1.2A
PT4204C = 12V/0.6A
PT4301C = ±5V/1A
Free air convection, (40-60LFM)
Pin Temperature
Storage Temperature
Mechanical Shock
Tp
Ts
—
@ Pin1
—
—
—
—
95
°C
°C
-55
+125
Per Mil-STD-202F, Method 213B,
6mS half-sine, mounted to a PCB
—
—
50
10
—
—
G’s
G’s
PT4302C = +5.2V/1A,
Mechanical Vibration
—
Per Mil-STD-202F, Method 204D,
10-500Hz, mounted to a PCB
+3.3V/1A
PT4303C = ±12V/0.25A
Weight
—
—
—
—
—
20
—
—
—
grams
VDC
Isolation
—
1500
(For dimensions and PC
board layout, see Package
Style 900.)
Flammability
Materials meet UL 94V-0
** Minimum input voltage is adjustable - See application note.
66
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com