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Features
• DSL Triple Outputs
(Independantly Regulated)
• Input Voltage Range:
36V to 75V
• 1500VDC Isolation
• On/Off Control
• Current Limit
• Short Circuit Protection
(All Outputs)
Ordering Information
PT4841o = +15/+3.3/+1.5V (65W)
PT4842o = +12/+3.3/+1.8V (62W)
PT Series Suffix
(PT1234x)
Case/Pin Order Package
Configuration Suffix Code
Vertical N (EKD)
Horizontal A (EKA)
SMD C (EKC)
(Reference the applicable package code drawing for
the dimensions and PC layout)
Typical Application
PT4840 Series—48V
Description
The PT4840 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 65W,
these regulators are appropriate for
powering both analog and mixed-
signal circuitry. A typical application
is a chip-set for an ADSL/DSL line
card.
The output voltage combinations
offered by the PT4840 series provide
power for a low-voltage processor
core, the associated digital circuitry,
and analog support circuitry.
The PT4840 series incorporates
many features to simplify system
integration. These include a flexible
On/Off control, over-temperature
protection, and an input under-
voltage lock-out. All outputs are
current limited and short-circuit
protected. In addition, the low-
voltage outputs for processor core
and digital circuitry meet the power-
up and power-down sequencing
requirements of popular DSP ICs.
The PT4840 series is housed in
a space-saving solderable case. The
module requires no external heat sink
and can occupy as little as 1.97 in
2
of
PCB area.
C
in
= Optional
C
out
= Optional; See specifications
EN1 & EN2 pins: See On/Off Enable Logic
65-W Triple Output Isolated DC/DC
Converter for DSL Applications
SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002
DSL/ADSL
IC Chip Set
+V
IN
–V
IN
+15VDC
+3.3VDC
+1.5VDC
PT4841
1
2
11
15,16
22,23
18–20
12,13
3
Vo
1
COM
COM
Vo
2
Vo
3
+V
IN
–V
IN
EN 1
Vo
2
adjVo
3
adj
1721
Vo
2
Adjust
Vo
3
Adjust
C
OUT1
C
OUT3
C
OUT2
C
IN
4
EN 2
• Fixed Frequency Operation
• Over-Temperature Shutdown
• Under-Voltage Lockout
• Space Saving Package:
1.9 sq. in. PCB Area (suffix N)
• Solderable Copper Case
• Safety Approvals:
UL60950
CSA 22.2 950
VDE EN60950
