WRB-YT-1W Series
APPLICATION NOTES
Recommended input&output capacitors
Although these converters will work without external capacitors, they are
Value
necessary in order to guarantee the full parametric performance over the full
line and load range. All parts have been tested and characterized using the
following values and test circuit.
Cin
Cout
10μF, 200V
22μF, 16V
good low esr capacitor
good low esr capacitor
Test circuit, 5V, 12V and 15V output
ON/OFF Pin
This provides an OFF function, which puts the converter into a low power mode. When the pin is un-connected, the converter is on. The circuit used must be able to sink a
peak current of 50mA to guarantee turning the converter off. The circuit should be an open collector arrangement, an example circuit is shown below. Voltages should not be
applied directly to the ON/OFF pin. The BC547 should be fited close to the WRB-YT-1W ON/OFF pin to prevent the addition of excess wiring capacitance.
CONTROL PIN CIRCUIT INPUT VOLTAGE VCONTROL
Min.
0
Max.
0.2
Units
V
Module ON
Module OFF
1.6
30
V
Output voltage adjustment
The trim resistor equations are:
Where:
G
L
K
WRB0505YT-1W
WRB1205YT-1W,WRB2405YT-1W
WRBXX12YT-1W
30100
100000
38300
49900
1.24
1.24
2.5
3.76
3.76
9.5
WRBXX15YT-1W
2.5
12.5
TRIM UP
TRIM DOWN
When the output voltage is trimmed up, output current must be derated so that the maximum output power is not exceeded.
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