QA-XS Datasheet, PDF (2/2 Pages) Microdc power Technology Co., Ltd – 0.25W, FIXED INPUT, ISOLATED&UNREGULATED DUAL/SINGLE OUTPUT DC-DC CONVERTER

QA-XS&QB-XLS Series
ISOLATION SPECIFICATIONS
APPLICATION NOTE
Item
Isolation voltage
Isolation resistance
Test conditions
Tested for 1 minute and 1 mA max
Test at 500VDC
Min
1000
1000
OUTPUT SPECIFICATIONS
Item
Test conditions
Min
Typ
Max
Units
Requirement on output load
VDC
To ensure this module can operate efficiently and
reliably, During operation, the minimum output load
MΩ
is not less than 10% of the full load, and that this
product should never be operated under no load! If
the actual output power is very small, please connect
a resistor with proper resistance at the output end in
parallel to increase the load.
Typ
Max
Units
Output power
Line regulation
Load regulation
Output voltage accuracy
Temperature drift
For Vin change
of ±1%
10% to 100%
load
100% full load
(3.3V input)
(Others input)
(3.3V output)
(5V output)
(9V output)
(12V output)
(15V output)
0.25
±1.5
±1.2
12
20
10.5
15
8.3
15
6.8
15
6.3
15
See tolerance envelope graph
0.03
W
%
%/℃
Overload Protection
Under normal operating conditions, the output
circuit of these products has no protection against
overload. The simplest method is to connect a
self-recovery fuse in series at the input end or add a
circuit breaker to the circuit.
Recommended circuit
If you want to further decrease the input/output
ripple, an "LC" filtering network may be connected to
the input and output ends of the DC/DC converter,
see (Figure 1).
Ripple & Noise*
20MHz Bandwidth
50
75
mVp-p
Switching frequency
Full load, nominal input
100
KHz
*Test ripple and noise by "parallel cable" method. See detailed operation instructions at Testing .
Note:
1. All specifications measured at T A =25℃, humidity<75%, nominal input voltage and rated output load unless otherwise
specified.
2. See below recommended circuits for more details.
3. Dual output models unbalanced load: ±5%.
TYPICAL CHARACTERISTICS
OUTLINE DIMENSIONS & PIN CONNECTIONS
it should also be noted that the inductance and the
frequency of the "LC" filtering network should be
staggered with the DC/DC frequency to avoid mutual
interference. However, the capacitance of the output
filter capacitor must be proper. If the capacitance is
too big, a startup problem might arise. It's not
recommended to connect any external capacitor in
the application field.
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).
No parallel connection or plug and play.
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