PRELIMINARY Data Sheet
PLD08 Series – 8A Non-Isolated DC/DC Converter
5V Input, Dual 1.2 to 3.3V Output
3.3V Input, Dual 1.2 to 2.5V Output
Features
•
•
•
•
•
•
•
•
Surface mount configuration
1.56” by 0.55” low profile package
Two independently regulated outputs
Efficiency in excess of 90%
8A of combined output current at 65°C and
200LFM
Flexible output load distribution
Remote ON/OFF
Output voltage trim adjust for each output
Description
The
PLD08
series converters are surface mount non-isolated dual output DC/DC converters. The products
provide point of load conversion of a single 3.3V or 5V input voltage into two independently regulated low
output voltages. Each output can provide up to 5A of output current, has an independent feedback loop and
independent trim function. Two power trains operate out of phase thus significantly reducing input ripple
current and simplifying external filtering. High efficiency, low space requirements, and flexible loading
characteristics make the converters an ideal choice for powering multi-voltage ASICs.
PLD08 series have the following models:
MODEL(Note 1)
INPUT
VOLTAGE
Vin,nom(Vdc)
INPUT
VOLTAGE
RANGE
Vin (Vdc)
OUTPUT
VOLTAGE
Vo1/Vo2(Vdc)
RATED OUTPUT
CURRENT
Ira1/Ira2(A)(Note 2)
RIPPLE &
NOISE
Vo,pk-pk
(mV)
TYPICAL
EFFICIENCY
(Typ.)
PLD08UDC
PLD08UDB
PLD08UBA
PLD08VED
PLD08VEB
PLD08VDB
PLD08VBA
PLD08VAA
3.3
3.3
3.3
5.0
5.0
5.0
5.0
5.0
3.15-3.6
3.15-3.6
3.0-3.6
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
2.5/2.0
2.5/1.8
1.8/1.5
3.3/2.5
3.3/2.5
2.5/1.8
1.8/1.5
1.5/1.5
5/5
5/5
5/5
5/5
5/5
5/5
5/5
5/5
20/50
20/50
20/50
20/50
20/50
20/50
20/50
20/50
91%
91%
89%
93%
92%
91%
89%
88%
Notes:
1.
If require the different output models,
See APPENDIX A.
2.
Current range of Each output is 0.2~5A, total combined output current is < 8A. Iout1+Iout2 < 8A.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect
long term reliability and cause permanent damage to the converter.
REV. 3/36/02
www.power-one.com
Page 1 of 9
PRELIMINARY Data Sheet
PLD08 Series – 8A Non-Isolated DC/DC Converter
5V Input, Dual 1.2 to 3.3V Output
3.3V Input, Dual 1.2 to 2.5V Output
Parameter
Input Voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Conditions/Description
PLD08Uxx
PLD08Vxx
200LFM Air Flow, Full Load
Referenced to GND: PLD08Uxx
Referenced to GND: PLD08Vxx
Min
Max
3.6
5.5
+65
+125
3.6
5.5
Units
VDC
VDC
°C
°C
VDC
-25
-40
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Shock
Sinusoidal Vibration
Weight
Water Washing
MTBF
Conditions/Description
Halfsine wave, 3 axes
GR-63-Core, Section 5.A.2
Standard process
Per Bellcore TR-NWT-000332
Min
50
1
Nom
Max
Units
g
Oz/g
MHrs
0.2/5.7
Yes
5.4
Isolation Specifications
PLD08 series does not provide input to output isolation.
Parameter
Insulation Safety Rating
Conditions/Description
Min
Nom
NA
Max
Units
Input Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Input Voltage (continuous)
Conditions/Description
PLD08Uxx (Note 3)
PLD08Vxx
PLD08U (ramping up)
PLD08U (ramping up)
PLD08U (ramping down)
PLD08V (ramping down)
To Output Regulation Band
100% Resistive Load
Vin=Vin.max, Io1=Io2=4A
ESR < 0.1 Ohm
Min
3.0
4.5
Nom
3.3
5.0
2.8
3.7
2.5
2.5
5
0.04
100
Max
3.6
5.5
Units
VDC
VDC
VDC
10
mS
A
2
s
µF
Turn-On Input Voltage
Under Voltage Lock out
Turn-On Time
Inrush Transient
External Capacitor (required)
REV. 3/36/02
www.power-one.com
Page 2 of 9
PRELIMINARY Data Sheet
PLD08 Series – 8A Non-Isolated DC/DC Converter
5V Input, Dual 1.2 to 3.3V Output
3.3V Input, Dual 1.2 to 2.5V Output
Output Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current Range(Note 4)
Line Regulation
Load Regulation
Total output voltage regulation
Dynamic Regulation:
Peak Deviation
Settling Time (to 1% error band)
Admissible Load Capacitance
Output Current Limit Threshold**
Switching Frequency
Temperature Coefficient
Output Ripple and Noises
Conditions/Description
Vin.nom, 50% Load
Individual Output
Total Combined Current
Vin.min to Vin max at
Iout.max
At Vin nom, Iout.0.8A to 8A
Over all input voltage, load,
and temperature conditions
50-25-50% load step change
on either output while other
output at 4A
Vin nom, Iout.max
Vout 0.97Vout.nom
Min
-1.5
0.2
0.4
Nom
Max
1.5
5
8
0.2
7
3.0
Units
%Vout
ADC
ADC
%Vout
mV
%Vout
+/-20
30
1000
115
550
+/-50
200
mVp-p
µS
µF
%Iout
kHz
%/°C
mVrm
s
mVp-p
%Vout
230
0.01
20
50
Vin nom, Iout.max
10
30
Trim Range
Vin nom, Iout.max
PLD08Uxx(Note 5)
PLD08Vxx
Each output, ESR < 0.1 Ohm
90
90
100
110
110
µF
External Capacitor (required)
Notes:
3. If output voltage is 2.5V, minimum input voltage is 3.15V.
4. At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications.
If model is operating over rating current, model should be given some protection (input side fuse and so on).
5. 105 for 2.5V output
Feature Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Shutdown (ON/OFF)
Logic Low
Logic High
Conditions/Description
On/Off signal low – converter is OFF
On/Off signal high or floating –
converter is ON
Min
0
Vin min
Nom
Max
0.4
Vin
max
Vin
N/A
°C
Units
VDC
Open circuit voltage
Overtemperature
Protection
REV. 3/36/02
www.power-one.com
Page 3 of 9
PRELIMINARY Data Sheet
PLD08 Series – 8A Non-Isolated DC/DC Converter
5V Input, Dual 1.2 to 3.3V Output
3.3V Input, Dual 1.2 to 2.5V Output
Typical Application
Figure 7 shows the recommended connections for
the PLD08 series converter.
Fig.7 Typical application of PLD08 series
The PLD series converters do require external
input and output capacitors for proper operation.
A minimum of a 100ìF capacitor with an ESR
<0.1Ω is to be connected to the input and to each
of the outputs of the PLD08 series. Note that each
output also requires a minimum current of 0.2A for
proper functioning.
If the magnitude of the inrush current needs to be
limited, see the “Inrush Current Control
Application Note” on www.power-one.com.
For output decoupling, it is recommended using
small ceramic capacitors connected directly
across the output pins of the converter. Note that
the capacitors do not substitute the filtering
required by the load.
optical coupler directly at the module will solve
any of these problems.
Output Voltage Trim
The trim feature allows the user to adjust each of
the output voltages by +/-10% from the nominal
(except the 3.3V input with 2.5V output model).
This can be used to compensate distribution
drops, perform margining in production, or
accommodate other requirements when output
voltage needs to be adjusted from the nominal.
The Trim Function
The trim mechanism for the PLD08 series is a
negative one. Each of the outputs trims up with a
resistor from the TRIM pin to the GND pin and
trims down with a resistor from the TRIM pin to
the respective +Vout pin.
Fig.1 PLD08 series trim up schematic
V
out1
TRIM 1
R
up
1
V
out2
TRIM 2
R
up
2
GND
Shutdown Feature Description
The ON/OFF pin in the PLD08 series converters,
functions as a normal soft shutdown.
It is
referenced to the GND pin (see Figure 7). When
the ON/OFF pin is pulled low to within 0.4 V of
ground, the outputs are turned off and the unit
goes into a very low input power mode.
(Isn’t this the on/off pin above?)When the pin is
left floating or pulled high to Vin, the unit is ON
and operates normally.
An open collector switch is recommended to
control the voltage between the ON/OFF pin and
the GND pin of the converter. The ON/OFF pin is
pulled up internally, so no external voltage source
is required.
The user should avoid connecting
a resistor between the ON/OFF pin and the
+Vin pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the
pin reference for the control is really the GND pin.
The control signal must not be referenced ahead
of EMI filtering, or remotely from the unit.
Optically coupling the information and locating the
REV. 3/36/02
www.power-one.com
The general equation for trimming the output
voltage on either output of the PLD08 series is
invariantas shown below:
R
TrimUP
=
4.99 * 0.8
−
1
kOhm
Vadj
−
Vout
Page 4 of 9
PRELIMINARY Data Sheet
PLD08 Series – 8A Non-Isolated DC/DC Converter
5V Input, Dual 1.2 to 3.3V Output
3.3V Input, Dual 1.2 to 2.5V Output
Fig.9 PLD08 series trim down schematic
The PLD08 series converters do
not provide
isolation
from input to output.
Relevant isolation requirements according to all
IEC60950 based standards must be provided by
the input devices to the PLD08 series module.
Nevertheless, if the system using the converter
needs to receive safety agency approval, certain
rules must be followed in the design of the
system. In particular, all of the creepage and
clearance requirements of the end-use safety
requirements must be observed.
These
documents include UL60950 - CSA60950-00 and
EN60950, although specific applications may
have other or additional requirements.
The PLD08 series converters have no internal
fuse. An external fuse must be provided to
protect the system from catastrophic failure. A
fuse with a rating not greater than 7A, 125V is
recommended. The user can select a lower rating
fuse based upon the inrush transient and the
maximum input current of the converter, which
occurs at the minimum input voltage. Both input
traces and the chassis ground trace (if applicable)
must be capable of conducting a current of 1.5
times the value of the fuse without opening. The
fuse must not be placed in the grounded input
line, if any.
In order for the output of the PLD08 series
converter to be considered as SELV (Safety Extra
Low Voltage), according to all IEC60950 based
standards, the input to the module needs to be
supplied by an isolated secondary source
providing a SELV also.
V
out1
R
down
1
TRIM 1
V
out2
R
down
2
TRIM 2
GND
Fig.2 PLD08 series trim up schematic
R
TrimDOWN
=
(
Vadj
−
0.8) * 4.99
−
1
Vout
−
Vadj
kOhm
When the output voltage is trimmed up,
the output power from the converter must not
exceed its maximum rating. This is determined by
measuring the output voltage on the output pins,
and multiplying it by the output current.
In order to avoid creating apparent load
regulation degradation, it is important that the trim
resistors are connected directly to the Vout and
output GND pins, and not to the load or to traces
going to the load.
The PLD08 series converters will trim
down more than the 10% limit. In general, this is
permissible. The user must confirm that the
results are acceptable in his application.
Safety Considerations
REV. 3/36/02
www.power-one.com
Page 5 of 9
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