PT4820 Series
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
Features
• Triple Outputs
(Independently Regulated)
• Input Voltage Range:
36V to 75V, 80V Surge
• 1500VDC Isolation
• Dual Logic On/Off Control
• Short-Circuit Protection
(All Outputs)
• Fixed Frequency Operation
• Over-Temperature Shutdown
• Under-Voltage Lockout
• Space Saving Package:
1.3 sq. in. PCB Area (suffix N)
• Solderable Copper Case
• Safety Approvals:
UL60950
CSA 22.2 950
VDE EN60950
Description
The PT4820 Excalibur™ power
modules are a series of isolated triple-
output DC/DC converters that
operate from a standard (–48V)
central office supply. Rated for up to
35W, these regulators are ideal for
powering many mixed logic appli-
cations. The triple-output voltage
combination allows for a compact
multiple-output power supply in a
single low-profile DC/DC module.
The available output voltage
options include a low-voltage power
bus for a DSP or ASIC core, and
two additional standard logic supply
voltages.
Typical Application
The PT4820 series incorporates
many features to simplify system
integration. These include a flexible
On/Off enable control, an input
under-voltage lock-out, and over-
temperature protection. All outputs
have short-circuit protection and are
internally sequenced to meet the
power-up and power-down require-
ments of popular DSP ICs.
The PT4820 series is housed in
a space-saving solderable case. The
module requires no external heat sink
and can occupy as little as 1.3 in2 of
PCB area.
Ordering Information
PT4821o = +3.3/+2.5/+1.5V
PT4822o = +3.3/+1.8/+1.5V
PT4823o = +3.3/+2.5/+1.2V
PT4824o = +3.3/+1.8/+1.2V
PT4825o = +3.3/+1.5/+1.2V
PT4826o = +5.0/+3.3/+1.8V
PT4827o = +3.3/+2.5/+1.8V
PT4828o = +5.0/+2.5/+1.5V
PT4829o = +5.0/+1.8/+1.5V
PT4831o = +5.0/+3.3/+1.5V
PT4832o = +5.0/+3.3/+2.5V
* PT4833o = +3.3/+2.0/+1.5V
* The PT4833 is not included in the VDE
safety certification.
PT Series Suffix (PT1234 x )
Case/Pin
Configuration
Order Package
Suffix Code
Vertical
Horizontal
SMD
N (ENM)
A (ENN)
C (ENP)
(Reference the applicable package code drawing for
the dimensions and PC layout)
+VIN
+
CIN
–VIN
Cin
Co1, Co2, Co3
EN1 & EN2 pins:
= Optional
= Optional; See specifications
See On/Off Enable Logic
3 +VIN
PT4820
+Vo 1 12,13
V1 Adj 11
COM 9,10
+
Co1
I/O
1 EN 1
2 EN 2
4 –VIN
+Vo 2 16,17
V2 Adj 15
COM 14
+
Co2
Logic
+Vo 3 20,21
V3 Adj 19
COM 18
+
Co3
Core
DSL, DSP,
or ASIC
Chipset
For technical support and more information, see inside back cover or visit www.ti.com
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