Texas Instruments PT3321A, PT3321C, PT3321N, PT3322A, PT3322C Datasheet
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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 100µF/100V electrolytic
C
out
= Required 330µF electrolytic
Q1= 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
VO Adjust
• 30W Output Power
• Input Voltage Range:
36V to 75V
• 1500 VDC Isolation
• Vo Inhibit
• V
o
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 highinput voltage, 30 Watt, isolated DC to
DC converters housed in a unique
vertical or horizontal 19-pin SIP package. 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 automatically compensates for any voltage
drop from the converter to the load. The
PT3320 includes built in current limit,
short circuit protection and overtemperature shutdown.
The PT3320 requires a 330µF 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
(Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units
Output Current I
o
Over Vin range Vo = 3.3V 0.25 — 8.0 A
V
o
= 5V 0.25 — 6.0 A
Vo = 12V 0.1 — 2.5 A
On/Off Standby Current I
in standby
Vin = 48V, Pin 1 = -V
in
—8 16mA
Short Circuit Current I
sc
Vin = 48V — 2xI
omax
—A
Input Voltage Range V
in
Over Io Range 36.0 48.0 75.0 V
Output Voltage Tolerance ∆V
o
Over Vin Range
TA= -40°C to +85°C
— ±1.0 — %V
o
Line Regulation Reg
line
Over Vin range @ max I
o
— ±0.5 — %V
o
Load Regulation Reg
load
10% to 100% of Io max — ±0.5 — %V
o
Vo Ripple/Noise V
n
Vin=48V, Io=Io max, Vo>5V — 1.0 — %V
o
Vin=48V, Io=Io max, Vo<5V — 50 — mV
pp
Transient Response t
tr
50% load change, 1A/µSec — 100 — µSec
Vo over/undershoot, Vo>5V — 3.0 — %V
o
Efficiency η Vin=48V, Io=6A, Vo=3.3V — 80 — %
V
in
=48V, Io=6A, Vo=5V — 84 — %
Vin=48V, Io=2.5A, Vo=12V — 85 — %
Switching Frequency ƒ
o
Over Vin and Io Vo<10V 600 750 900 kHz
Vo>10V 400 500 600 kHz
Recommended Operating T
a
Vin = 48V @ max I
o
-40* — +85 °C
Temperature Range Airflow = 200 LFM
Storage Temperature T
s
— -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 — — MΩ
Flammability — Materials meet UL 94V-0
Inhibit (pin 2) On**
Referenced to -V
in
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-V
in
5-V
in
6-V
in
7+V
in
8+V
in
9+V
in
Pin Function
10 -V
o
11 -V
o
12 -V
o
13 -Remote Sense
14 +V
o
15 +V
o
16 +V
o
17 +V
o
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
Application Notes
Mechanical Outline
Product Selector Guide
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
Note 1: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter.
PT3322, 5.0 VDC (See Note 1) PT3323, 12.0 VDC (See Note 1)
Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Output Current
Ripple vs Output Current Ripple vs Output Current Ripple vs Output Current
Power Dissipation vs Output Current Power Dissipation vs Output Current Power Dissipation vs Output Current
PT3321, 3.3 VDC (See Note 1)
Efficiency (%)Ripple (mV)PD (Watts)
Efficiency (%)
Efficiency (%)
Ripple (mV)
Ripple (mV)PD (Watts)
PD (Watts)
Iout (A) Iout (A)
Iout (A) Iout (A) Iout (A)
Iout (A) Iout (A)Iout (A)
Iout (A)
SeriesPT3320
CHARACTERISTIC DATA
40
50
60
70
80
90
02468
36.0V
48.0V
60.0V
75.0V
40
50
60
70
80
90
0123456
36.0V
48.0V
60.0V
75.0V
40
50
60
70
80
90
0.0 0.5 1.0 1.5 2.0 2.5
36.0V
48.0V
60.0V
75.0V
Vin
Vin
Vin
0
10
20
30
40
02468
36.0V
48.0V
60.0V
75.0V
0
2
4
6
8
02468
36.0V
48.0V
60.0V
75.0V
Vin
Vin
0
10
20
30
40
50
012345 6
36.0V
48.0V
60.0V
75.0V
Vin
0
1
2
3
4
5
6
7
0123456
36.0V
48.0V
60.0V
75.0V
Vin
0
20
40
60
80
100
120
140
160
0.0 0.5 1.0 1. 5 2.0 2.5
36.0V
48.0V
60.0V
75.0V
Vin
0
1
2
3
4
5
6
0.0 0. 5 1.0 1.5 2.0 2.5
36.0V
48.0V
60.0V
75.0V
Vin
Safe Operating Area (@Vin=48V) Safe Operating Area (@Vin=48V) Safe Operating Area (@Vin=48V)
Iout (A) Iout (A) Iout (A)
20
30
40
50
60
70
80
90
02468
Nat conv
60LFM
120LFM
200LFM
Ambient Temperature (°C)
20
30
40
50
60
70
80
90
0123456
Nat conv
60LFM
120LFM
200LFM
20
30
40
50
60
70
80
90
0 0.5 1 1.5 2 2.5
Nat conv
60LFM
120LFM
200LFM
Ambient Temperature (°C)
Ambient Temperature (°C)
Airflow
Airflow
Airflow
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