RDS Power-One, RDS Datasheet - Page 7

• Manufacturer Part Number: RDS
• Description: Rds Dc-dc Series Rds Dc-dc Series
• Manufacturer: Power-One

Typical Application
This series of converters does not require any external
components for proper operation.
distribution of the input voltage to the converter
contains significant inductance, a capacitor across the
input terminals may be required to stabilize the input
voltage.
ceramic capacitor is recommended for this purpose.
For output decoupling it is recommend connecting a
1μF ceramic capacitor directly across the output pins
of the converter.
Shutdown Feature
The remote control pin functions as a normal soft
shutdown.
positive logic, when the remote control pin is pulled
low, the output is turned off and the unit goes into a
very low input power mode.
An open collector switch is recommended to control
the voltage between the shutdown pin and the -Vin pin
of the converter. The remote control pin is pulled up
internally, so no external voltage source is required.
The user should avoid connecting a resistor between
the shutdown pin and +Vin pin.
Care must be taken to ensure that the pin reference
for the control is connected close to the -Vin pin. The
control signal must not be referenced ahead of EMI
filtering, or remotely from the unit.
control pin is not used, it can be left floating.
Negative Logic
The output of the converter may be enabled or
disabled by means of a logic signal (TTL, CMOS, etc.)
applied to the shutdown pin. No output voltage
overshoot will occur when the unit is turned on. If the
function is not required the pin should be connected to
-Vin to enable the output .
Thermal Considerations
The converter is designed for natural or forced
convection cooling. The output power of the converter
is limited by the maximum case temperature (Tc). To
ensure reliable long term operation of the converters,
and to comply with safety agency requirements,
Power-One
temperature
Drawings).
NOV 11, 2005 revised to JUN 29, 2006
A minimum of 1μF, quality electrolytic /
It is referenced to the –Vin pin.
limits
(Tc)
(
excludes shut down)
to
maximum
100°C
(see
allowable
However, if the
If the remote
Mechanical
case
With
Page 7 of 12
20W SMT Converter
Output Current Limiting
When the output is overloaded above the maximum
output current rating, the voltage will start to reduce to
maintain the output power to a safe level.
condition of high overload or short-circuit where the
output voltage is pulled below approximately 30% of
Vo.Nom, the unit will enter a ‘Hiccup’ mode of
operation.
attempt to restart, approximately every 25 ms until the
overload has cleared.
Parallel Operation
Paralleling of two converters is not possible.
Output Voltage Trim
The trim feature allows the user to adjust the output
voltage from the nominal.
Output voltage can be adjusted using an external
resistor. To increase Vo a resistor should be
connected between pins 2 and 3. To decrease Vo a
resistor should be connected between pins 1 and 3.
To increase Vo:
To reduce Vo:
Where Vout is the desired output voltage
Note:
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
voltage on the output pins, and multiplying it by the
output current.
RDS06ZB
RDS04ZG
RDS05ZE
Model
Rext = (A – (D x Vout)) / ( Vout – Vout.Nom), Ω
Rext = ((B x Vout) - C) / ( Vout.Nom - Vout), Ω
RDS DC-DC Series Data Sheet
Under this condition the converter will
11260
2590
7010
A
•
1.8V to 5V Output
1730
3161
4532
B
www.power-one.com
11240
2560
7010
C
1500
1500
750
D
In a