Requirement On Output Load
In regular circuits, our company’s DC/DC converters may be used directly To ensure this module can operate efficiently and reliably, a minimum load
without any peripheral components (see Figure 2). The basic input/output
et4U.comisolation may be used to provide a group of simple isolated polar output
is specified for this kind of DC/DC converter in addition to a maximum load
(namely full load). During operation, make sure the specified range of input
power supplies or to generate power supply lines of different voltages.
voltage is not exceeded, the minimum output load is not less than 10% of
Voltage And Polarity Inversion
should never be operated
very small, please connect
A key performance of this DC/DC converter is high electric isolation with proper resistance at the output end in parallel to increase the load.
capability. Thus, only one DC/DC converter may allow for several
potential differences in the layout of circuit board. If necessary, you may Overload Protection
connect the output end of the positive to input ground, then the negative Under normal operating conditions, the output circuit of these products
output end will generate a negative voltage (see Figure 1).
has no protection against over-current and short-circuits. The simplest
In some circuits which are sensitive to noise and ripple, a filtering
method is to connect a self-recovery fuse in series at the input end or add
a circuit breaker to the circuits.
capacitor may be added to the DC/DC output end and input end to Output Voltage Regulation and Over-voltage Protection Circuit
reduce the noise and ripple. However, the capacitance of the output filter The simplest device for output voltage regulation, over-voltage and over-
capacitor must be proper. If the capacitance is too big, a startup problem current protection is a linear voltage stabilizer with overheat protection
might arise. For every channel of output provided the safe and reliable that is connected to the input or output end in series (see Figure 4).
operation is ensured, the greatest capacitance of its filtering capacitor
sees the External Capacitor Table. To get an extremely low ripple, a “LC”
filter network may be connected to the input and output ends of the
DC/DC converter, which may produce a more significant filtering effect. It
should also be noted that the inductance and the frequency of the “LC”
The MTBF is the mean time between failures under full load. If the actual
load is less than 20% of the rated load or greater than the rated load, then
this productís reliability will be greatly reduced.
filter network should be staggered with the DC/DC frequency to avoid Input Polarity Protection
mutual interference (see Figure 3).
Under normal conditions, this productís input circuit has no protection
against polarity inversion; the solution is to connect a diode in series at
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