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RNS/RND Series Data Sheet
10 W SMT DC-DC Converters
Application and Auxiliary Functions
Shutdown (Remote Control)
Parameter
Conditions/Description
Min
Nom
Max
Units
Remote Control :
Converter OFF
Converter ON
Sink Current
RC pin is pulled low
Voltage source or open circuit
Vin=Vin.Nom
–1.0
4.0
0.3
1.0
6
V
V
mA
Synchronization:*
TTL compatible square wave on
Frequency Range
sync pin. Referenced to –Vin
(RNS 4:1 input range)
450
(520)
600
(688)
kHz
* All RNS except RNS0.6ZH, and RND0.8ZHH (as only RND model)
The remote control pin functions as a normal soft
shutdown. It is referenced to the –Vin 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 input power mode.
An open collector switch is recommended to control
the voltage between the remote control 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 remote control pin and the +Vin pin.
The user must take care 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. If the
remote control pin is not used, it can be left floating.
External Components
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 recommended to connect,
directly across the output pins, a 1 μ F ceramic
capacitor (for 3.3 V and 5 V outputs) or a 0.27 μ F
ceramic capacitor (for 7 V and 12 V outputs).
Synchronization Feature
It is possible to synchronize the switching frequency of
one or more converters to an external symmetrical
clock signal. It is recommended that the signal be
driven by a TTL compatible output. The rise time
of the clock signal should be less than 10 ns. If
the synchronization feature is not used, SYNC
(pin 7) should be left open-circuit.
PUL (Programmable Undervoltage Lockout)
Note :- This feature is not available on 4:1 input range
devices, RNS01EE/RNS01EG/RNS0.9ET.
An external resistor can program the input voltage at
which the converter switches on . The voltage at which
the unit switches off , is typically 1V below the turn-on
input voltage (Vion).
The characteristic curves below shows the typical
resistor values required to achieve adjustment of turn-
on input voltage (Vion).
BCD.00038 Rev. AA, 28-Mar-2012
Page 18 of 24
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