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SLC100-1 Scheda tecnica(PDF) 6 Page - C&D Technologies

Il numero della parte SLC100-1
Spiegazioni elettronici  40 Amp SINGLE OUTPUT QUARTER BRICK DC / DC CONVERTER
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Produttore elettronici  CANDD [C&D Technologies]
Homepage  http://www.cdpowerelectronics.com
Logo CANDD - C&D Technologies

SLC100-1 Scheda tecnica(HTML) 6 Page - C&D Technologies

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SLC100 1.2V Rev C 11/2004
Product: www.cdpoweronline.com
Remote ON/OFF Function
Figure 4 – Remote ON/OFF Control Circuit
Protective Functions
Temperature Shutdown
The over temperature shutdown feature of the
SLC100 will cause the unit to shutdown at a typical
pwb internal monitor point temperature of 135oC. This
protective feature is comprised of a thermistor in the
units control loop. At a temperature of 135oC this
circuit will cause the PWM to go into an idle mode,
resulting in no output from the converter and prevent-
ing damage to the converter components. When the
temperature of the unit drops below 125oC the fault
condition will clear and the converter will resume nor-
mal operation. If the cause of the over temperature
condition is not identified and corrected the unit will
continue to cycle on and off indefinitely.
Input Under-Voltage Shutdown
The nominal input voltage for the SLC100 is 48Vdc.
Once turned on reducing the input voltage to 32.0 Vdc
nominal will shut down the device. At an input voltage
less than 32.0V the under-voltage sensing circuit will
send a signal to the PWM causing it to go into idle
mode. This will result in no output from the converter,
protecting the unit from a high input current condition.
When the input voltage returns to a level above 33.3V
the unit will return to normal operation. The unit will
typically turn on at an input voltage of between 33.3V
and 34.5V nominal as indicated on the Product Data
Sheet. This is due to hysterisis designed into the
protective circuit to prevent excessive cycling of the
converter.
The SLC100 is equipped with a primary ON/OFF pin
used to remotely turn the converter on or off via a
system signal. The input is TTL open-collector and/or
FET open-drain compatible. For the positive logic
model a system logic low signal will turn the unit off.
For negative logic models a system logic high signal
will turn the converter off. For negative logic models
where no control signal will be used the ON/OFF pin
should be connected directly to –Vin to ensure proper
operation. For positive logic models where no control
signal will be used the ON/OFF pin should be left
open.
APPLICATION NOTES
The resistance value required to achieve the desired
amount of positive/negative trim can be determined
by referring to the trim table for each model. If trim-
ming is not desired then the Trim pin may be left
open. In addition to the resistor values provided in
the trim tables, the following equations can be use
to calculate the required resistor value for a desired
output voltage. These equations apply for the 1.5V
and above models. For 1.2V models the trim tables
must be used.
Remote ON/OFF Control Function
Figure 3 – Trim Down Circuit
To lower the converter output voltage a resistor must
be placed between the Trim pin and -Vout pin as
shown in Figure 3.
5.11V
(100+∆%) - 511 - 10.22 kΩ
Vref ∆%
∆%
Vref=1.225
-10.22 kΩ
[
[
Rtrim_down = 5.11
∆%
)
(
Rtrim_UP =
out


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