
For technical support and more information, see inside back cover or visit www.ti.com
Standard Application
Features
18V to 36V Input Voltage Range
Programmable Output Voltage
Range: 6.5V to 17.5V
-40° to +85°C Ambient
1500 VDC Isolation
89% Efficiency
On/Off Inhibit
Differential Remote Sense
17A Output with PT4493
SLTS129B
(Revised 6/21/2002)
Description
The PT4476 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
8.5A of output current over the program-
mable voltage range of 6.5V to 17.5V.
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
PT4476 may be operated with up to two
PT4493 compatible booster modules.
Each PT4493 adds an additional 8.5A 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
PT4476
+V
sns
+V
out
-V
out
-V
sns
7
8-13
14-19
20
25
22
24
23
VID0 - VID4
21
+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 33μF electrolytic capacitor
C
1
= Optional 33μF, 50V electrolytic capacitor
C
2
= Optional 1μF, 50V ceramic capacitor
Programming pins, VID0–VID4, are shown
configured for Vo =12V
For normal operation, pin 3 (Inhibit) must be
connected to –Vin.
Ordering Information
PT 4476
= 6.5 to 17.5 Volts
PT 4493
= 8.5-A Booster
PT Series Suffix
(PT1234
x
)
Case/Pin
Configuration
Vertical
Horizontal
SMD
Order
Suffix
N
A
C
Package
C ode *
(EKD)
(EKA)
(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
2
+V
in
–V
in
Inhibit
V
r
V
a
Do not connect
3
4
5
6
7
8
9
10 +V
out
11 +V
out
12 +V
out
13 +V
out
(+)Remote Sense
+V
out
+V
out
Pin
Function
14
15
–V
out
–V
out
–V
out
–V
out
–V
out
–V
out
(–)Remote Sense
VID0
VID1
VID2
16
17
18
19
20
21
22
23
24
25
26
VID3
VID4
DRV
PT4476—24V
100-W 8.5-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.