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RND DC-DC Series Data Sheet
10W SMT Converter ? 3.3V & 5V to ± 15V Dual
Typical Application
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 stabilise the
input voltage. A minimum of 1 μ F, quality electrolytic
/ ceramic capacitor is recommended for this purpose.
KOhm
2000
1500
1000
500
RND0.8ZHH - Resistance required to
decrease Vion
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
0
33.8
33.66
33.33 33
Voltage (Vion)
32
31
ceramic capacitor (for 12 V outputs).
RND0.8ZHH - Resistance required to
Synchronization Feature
It is possible to synchronize the switching frequency
KOhm
1600
1400
increase Vion
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, it should be left
open circuit.
1200
1000
800
600
400
200
0
34.3
34.8
35.2 37.5
Voltage (Vion)
40.5
42
Turn-On Input Voltage
An external resistor can program the input voltage at
which the converter switches on. The voltage at
which the unit switches off is typically 1 V below the
turn-on input voltage (Vion).
KOhm
1600
1400
1200
1000
800
RND02ZGE - Resistance required to
decrease Vion
The characteristic curves below shows the typical
resistor values required to achieve adjustment of
turn-on input voltage (Vion).
600
400
200
0
35.6
35.4
35
34.2
33.5
33
Voltage (Vion)
To decrease Vion the resistor should be connected
between pins 10 and 11.
To increase Vion the resistor should be connected
between pins 11 and 17.
KOhm
1600
1400
1200
1000
800
600
400
200
0
RND02ZGE - Resistance required to increase
Vion
36.05
36.45
36.9
37.5
39.5
42
Voltage (Vion)
MCD10214 Rev. 1.0, 20-Aug-10
Page 10 of 16
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