PT3400 Series
35-W 48-V Input Isolated
DC/DC Converter
SLTS164B - JULY 2002 - REVISED OCTOBER 2002
Features
• Input Voltage Range:
36V to 75V
• 35W Output Power
• 90% Efficiency
• 1500 VDC Isolation
• Low Profile (8 mm)
• Adjustable Output Voltage
• Dual-Logic On/Off Enable
• Power-Up Sequence Control
• Differential Remote Sense
• Over-Current Protection
• Space Saving Package
• Solderable Copper Case
• Safety Approvals Pending
Description
The PT3400 Excalibur™ power modules
are a series of 35-W rated DC/DC converters
housed in a low-profile space-saving copper
case. Fully isolated for telecom applications,
the series includes a number of standard volt-
ages, including 1.0 VDC. Other applications
include industrial, high-end computing, and
other distributed power applications that
require input-to-output isolation.
PT3400 modules incorporate a feature
that simplifies the design of multiple voltage
power supplies in DSP and ASIC applications.
Using the SEQ control pin, the output voltage
of two PT3400 modules in a power supply
system can be made to self sequence at power-
up. Other features include output voltage
adjust, over-current protection, input under-
voltage lockout, and a differential remote
sense to compensate for any voltage drop
between the converter and load.
Standard Application
Ordering Information
PT3401H = 3.3V/10A (33W)
PT3402H = 2.5V/12A (30W)
PT3403H = 1.8V/12A (21.6W)
PT3404H = 1.5V/16A (24W)
PT3405H = 1.4V/16A (22.4W)
PT3406H = 1.2V/16A (19.2W)
PT3407H = 1V/16A (16W)
PT3408H = 5V/7A (35W)
PT Series Suffix (PT1234x )
Case/Pin
Configuration
Order
Suffix
Package
Code
Vertical
N (EPL)
Horizontal
A (EPM)
SMD
C (EPN)
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Pin-Out Information
Pin Function
1 EN 1
2 EN 2*
3 –Vin
4 +Vin
5 SEQ
6 Vout Adj
7 –Vsense
8 –Vout
9 –Vout
10 –Vout
11 +Vout
12 +Vout
13 +Vout
14 +Vsense
* Negative logic
Shaded functions indicate those
pins that are referenced to –Vin.
+VIN
4
+VIN
+VSENSE 14
+VOUT 11–13
Remote Sense (+)
+VOUT
–VIN
1 EN 1
PT3400
† COUT
330µF
2 EN 2
–VOUT 8–10
–VOUT
3 –VIN
–VSENSE 7
* Remote Sense (–)
L
O
A
D
SEQ
5
Vo Adj
6
VO Adj
SEQ
† An output capacitor is required on models
with an output voltage less than 2.5V.
* –Vsense (pin 7) must be connected to -Vout ,
either at the load or directly to pin 8 of the
converter.
For technical support and more information, see inside back cover or visit www.ti.com
