CC3-4805SR-E Datasheet, PDF (23/25 Pages) TDK Electronics – Insulation type DC-DC converter

CC-E
23
Calculating connected resistance Ra, Rb (kΩ) from set out-
put voltage Vout (V)
Adding a resistance Ra between TRM terminal and -Vout
terminal, to set the output voltage high
*1 Ra = 1.04/(Vout-3.3) - 2.83
*2 Ra = 12.75/(Vout-5) - 12.69
*3 Ra = 48.4/(Vout-12) - 16.18
*4 Ra = 54.7/(Vout-12) - 18
Adding a resistance Rb between TRM terminal and
+Vout terminal, to set the output voltage low
*5 Rb = 1.69/(3.3-Vout) - 3.66
*6 Rb = 12.78/(5-Vout) - 17.79
*7 Rb = 184.1/(12-Vout) - 35.54
*8 Rb = 470.3/(12-Vout) - 61.75
Fig.13
Fig.14
Load
Ra _{  }
3.3ʙ3.67Vɺ5ʙ6Vɺ12ʙ15V
Rb _{  }
Load
3.15ʙ3.3Vɺ4.75ʙ5Vɺ11.4ʙ12V
Fig.15
Fig.16
Load Load ^{Ra }
+12ʙ+15V
–12ʙ–15V
Load Load
+11.4ʙ+12V
Rb _
–11.4ʙ–12V
1-4. Over current protection
1.5-10W type
An over current protection circuit is incorporated in the
model, and if over current occurs, the output voltage is
lowered. By removing the over current and shorted condi-
tions, the output voltage automatically resumes. Note that
if the over current status continues for 30 seconds or over,
the internal elements of the converter may be deteriorated
or damaged. The current value, from which it is judged as
an over current, is not to be lower than the nominal current
value. If the output voltage does not resume even after re-
moving the over current conditions and any causes, turn off
the power or remote control once, and then restart it.
1-5. Over voltage protection
An over voltage protection function is not incorporated in
the model. Be careful if an external voltage over the nomi-
nal voltage is applied, damage may be caused.
1-6. Low input voltage protection
This series is equipped with the low input voltage protec-
tion in order to prevent malfunction due to low input volt-
age. The converter stops operation if the input voltage
become lower than the set voltage. The set ranges are
shown in the table below.
.PEFM
OBNF

*OQVU
WPMUBHF
SBOHF

UP
UP
UP
UP
UP
UP
Voltage range set for protection circuit
UP
UP
UP
UP
UP
UP
To be replaced with 1R5(1.5W), 3(3W), 6(6W), or 10(10W) for actual model names.
1-7. Insulation withstand voltage
The insulation withstand voltage between input and output,
and between terminal and case, is AC500V.
1-8. Series/Parallel connections
Series connection
Serial connection is applicable by wiring as shown in the
figure below (left). If output voltage is not generated by this
connection, connect a Schottky diode in which the forward
voltage is possibly low.
Also note that the Schottky diode should have a reverse
voltage that is twice or over the value of the voltage be-
tween +Vout and -Vout.
And the output current should be the same or lower than
the nominal current value, whichever is smaller in the con-
verters.
+Vin
+Vout
+Vin
+Vout
–Vin
+Vin
–Vout
+Vout
–Vin
+Vin
–Vout
+Vout
15/25W type
An over current protection circuit is incorporated in the
model, and if over current occurs, the output voltage is
lowered and the converter is stopped and latched. The
output voltage does not automatically resume even after
removing the over current and shorted conditions.
To resume output voltage, restart input or reset remote on/
off.
The current value, from which it is judged as an over cur-
rent, is not to be lower than the nominal current value.
–Vin
–Vout
–Vin
–Vout
Parallel connection
Parallel connection is not applicable.
・All specifications are subject to change without notice.