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NDS Series Data Sheet
10 W SMT DC-DC Converters, 1.5 – 5 V Output
Application and Auxiliary Functions
This series of converters does not require any external
components for proper operation. However, if the
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. A minimum of 1 μ F, quality electrolytic /
ceramic capacitor is recommended for this purpose.
For output decoupling it is recommend connecting a
1 μ F ceramic capacitor directly across the output pins
Output Current Limitation
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. In a
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. Under this condition the unit will attempt to
restart, approximately every 25 ms, until the overload
has cleared.
of the converter.
Output Voltage Adjustment
Shutdown Feature
The trim feature allows the user for adjusting the
The remote control pin functions as a normal soft
shutdown. It is referenced to the –Vi pin. With positive
logic, when the remote control pin is pulled low, the
output is turned off and the unit goes into a very low
output voltage by means of an external resistor. To
increase V o a resistor should be connected between
pins 12 and 14. To decrease V o a resistor should be
connected between pins 12 and 13.
input power mode.
To increase V o :
An open collector switch is recommended to control
the voltage between the remote control pin and the
– Vi 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 remote control pin and the +Vi pin.
The user must take care to ensure that the pin
reference for the control is connected close to the –Vi
Rext = (A – (D x V o )) / ( V o – V o nom ) [ ? ]
To reduce V o :
Rext = ((B x V o ) – C) / ( V o nom – V o ), [ ? ]
Where V o is the desired output voltage
pin. The control signal must not be referenced ahead
of EMI filtering, or remotely from the unit. If the remote
control pin is not used, it can be left floating.
Thermal Considerations
The converter is designed for natural or forced
convection cooling. The output power of the converter
Model
NDS03ZA
NDS03ZB
NDS03ZD
NDS03ZE
NDS02ZG
A
1945
2590
5010
7010
11260
B
1470
1730
2516
3161
4532
C
1944
2560
5010
7010
11240
D
470
750
1500
1500
1500
is limited by the maximum case temperature (T c ). To
ensure reliable long term operation of the converters,
and to comply with safety agency requirements,
Power-One limits maximum allowable case
temperature (T c ) to 100 °C; see Mechanical Drawings.
Parallel Operation
Paralleling of two converters is not possible.
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.
BCD.00013 Rev. AB, 26-Aug-2010
Page 9 of 14
www. power -one.com
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