In order to ensure the product operates efficiently and reliably, make sure the specified range of input voltage is not exceeded and the
minimum output load is not less than 10% load. If the actual load is less than the specified minimum load, the output ripple may
increase sharply while its efficiency and reliability will reduce greatly. If the actual output power is very small, please add an
appropriate resistor as extra loading.
Overload Protection
Under normal operating conditions, the output circuit of these products has no protection against over-current and short-circuits. The
simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit.
Filtering
In some circuits which are sensitive to noise and ripple, a
fi
ltering capacitor may be added to the DC/DC output end and input end to
reduce the noise and ripple. However, the capacitance of the output
fi
lter capacitor must be proper. If the capacitance is too big, a
startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest
capacitance of its
fi
lter capacitor sees the external capacitor table. To get an extremely low ripple, an “LC”
fi
ltering network may be
connected to the input and output ends of the DC/DC converter, which may produce a more significant
fi
ltering effect. It should also
be noted that the inductance and the frequency of the “LC”
fi
ltering network should be staggered with the DC/DC frequency to avoid
mutual interference (Figure 1).
Figure 1
Vin
GND
Cin
2.
3.
DC DC
4.
Output Voltage Regulation and Over-voltage Protection Circuit
The simplest device for output voltage regulation, over-voltage and over-current protection is a linear voltage regulator with overheat
protection that is connected to the input or output end in series (Figure 2).
O
N
Figure 2
GND
Vin
(Vdc)
3.3/5
12
24
--
Vin
5.
External Capacitor Table
It is not recommended to connect any external capacitor in the application
fi
eld with less than 0.5 W output.
Cout
(μF)
4.7
2.2
1
--
Vout
(Vdc)
±3.3/±5
±9
±12
±15
Cout
(μF)
4.7
2.2
1
1
D
IS
C
Table 1
TI
REG
REG
DC DC
REG
cui.com
N
U
Cout
Cout
+Vo
0V
-Vo
+Vo
0V
-Vo
ED
For more information, please visit the
product page.
CUI Inc
│
SERIES:
VAT1-SMT
│
DESCRIPTION:
DC-DC CONVERTER
date
10/31/2012
│
page
5 of 5
REVISION HISTORY
rev.
1.0
1.01
1.02
1.03
description
initial release
new template applied
V-Infinity branding removed
added TR package option
date
The revision history provided is for informational purposes only and is believed to be accurate.
D
IS
C
O
N
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical
component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to
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