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For technical support and more information, see inside back cover or visit www.ti.com
Standard Application
Features
• 36V to 75V Input Voltage Range
• Programmable Output Voltage
Range: 4.6V to 5.7V
• -40° to +85°C Operating Temp
• 1500 VDC Isolation
• 90% Efficiency
• On/Off Inhibit
• Differential Remote Sense
• 40A Output with PT4498
SLTS109B
(Revised 6/20/2002)
Description
The PT4484 Excalibur™ DC/DC
converter module combines state-of-the-
art power conversion technology with
un-paralleled flexibility. Incorporating
high efficiency and ultra-fast transient
response, these modules provide up to
20A of output current over the program-
mable voltage range of 4.6V to 5.7V.
The modules include a number of
inbuilt features to facilitate system
integration. These include a foldback
output current limit, over-temperature
protection, and an inhibit on/off control.
A differential remote sense is also provided
to compensate for voltage drop between
the converter and load.
For additional output current, one
PT4484 may be operated with up to two
PT4498 compatible booster modules.
Each PT4498 adds an additional 20A of
output current capability.
• Over-Current Protection
• Over-Temperature Protection
• Over-Voltage Protection
• Space-Saving Package
• Solderable Copper Case
• Safety Approvals:
UL 60950
CSA 22.2 950
VDE EN60950 Pending
L
O
A
D
PT4484
+V
sns
+V
out
-V
out
-V
sns
7
8-13
14-19
202522 2423
VID1 - VID4
+V
in
–V
in
1
2
3
Inhibit
C
1
+
PROGRAMMING PINS
+V
OUT
+V
IN
–V
IN
–V
OUT
C
o
+
C
2
•C
o
= Optional 150µF electrolytic capacitor
•C
1
= Optional 33µF, 100V electrolytic capacitor
•C
2
= Optional 1µF, 100V ceramic capacitor
• Programming pins, VID1–VID4, are shown
configured for Vo =5.0V
• For normal operation, pin 3 (Inhibit) must be
connected to –Vin.
Ordering Information
PT4484o = 4.6 to 5.7 Volts
PT4498o = 20-A Booster
PT Series Suffix
(PT1234x )
Case/Pin Order Package
Configuration Suffix Code *
Vertical N (EKD)
Horizontal A (EKA)
SMD C (EKC)
* Previously known as package styles 1200,
1210, and 1215.
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Pin-Out Information
Pin Function
1+V
in
2–V
in
3 Inhibit
4V
r
†
5V
a
†
6 Do not connect
7 (+)Remote Sense
8+V
out
9+V
out
10 +V
out
11 +V
out
12 +V
out
13 +V
out
Pin Function
14 –V
out
15 –V
out
16 –V
out
17 –V
out
18 –V
out
19 –V
out
20 (–)Remote Sense
21 Do not connect
22 VID1
23 VID2
24 VID3
25 VID4
26 DRV †
PT4484—48V
100-W 20-A Programmable
Isolated DC/DC Converter
† Pins 4, 5, & 26 are used for booster applications. For
stand-alone operation, leave open circuit.
• Shaded functions indicate those pins that are
referenced to primary-side potential.
