PAQ50S48-1R8 TDK Corporation, PAQ50S48-1R8 Datasheet - Page 31

• Manufacturer Part Number: PAQ50S48-1R8
• Description: LAMBDA PART
• Manufacturer: TDK Corporation

Specifications of PAQ50S48-1R8

• Rohs Compliant: YES

・All specifications are subject to change without notice.
PAQ
5 Maximum Line Regulation
Maximum line regulation is the maximum value of output
voltage change when input voltage is gradually varied with-
in specified input voltage range. The measurement point
for the input and output voltage are ±Vin, +Vo1, +Vo2
and GND (output terminal point) respectively.
6 Maximum Load Regulation
Maximum load regulation is the value of output voltage
change when output current is gradually varied within
specified output current range. The measurement point for
the input and output voltage are ±Vin, +Vo1, +Vo2 and
GND (output terminal point) respectively. When using at
dynamic load mode, the output voltage fluctuation might
increase.
7 Over Current Protection (OCP)
This power module has built-in OCP function. Output will
recover when short circuit or overload conditions are re-
leased immediately. OCP setting value is fixed and there-
fore, can not be externally adjusted. Also, take note, when
output voltage drops down below lower side of adjustment
range for 20ms - 50ms by output short circuit or over load
conditions, output might be shut down and latch.
Output can be recovered by manual reset (＞ − 400ms) of
the control ON/OFF terminal or by turning input line off
and then turning it on again. Auto-restart (/V option) from
OCP shutdown is available; please refer to the next sec-
tion.
8 Over Voltage Protection (OVP)
This power module has built-in OVP function. OVP set
point is a percentage of nominal output voltage value.
When output voltage exceeds OVP set point, output volt-
age shuts down. OVP set point is fixed and therefore can
not be changed. When OVP is triggered, output can be
recovered by i) turning input line off and then turning it on
again after the input voltage drop below the value indicat-
ed below, or ii) by manual reset of the control ON/OFF terminal
(＞ − 400ms).
/V Option (auto-restart)
The /V optional model will re-start with delay of 400ms〜
900ms after shutdown by OCP or OVP triggering. When
over voltage and over current are removed, output will re-
cover normally.
9 Over Thermal Protection (OTP)
This power module has built-in OTP function. This function
operates and shuts down the output when temperature of
the power module rises excessively. The power module will
recover automatically when the unit cools down. Take note
that OTP will operate again unless the cause of abnormal
heat of the power module is eliminated.
Input Voltage for OVP reset: 26VDC and below
65D
For the details of OTP, refer to the clause of “Mounting
method and Thermal Condition”
 ON/OFF Control (CNT Terminal)
Without turning the input supply on and off, the output can be en-
abled and disabled using this function. This function also can be
used for output sequence of multiple modules.
ON/OFF control circuit is on the primary side (the input side),
CNT Terminal pin. For secondary control, isolation can be
achieved through the use of a opto coupler or relay.
There are 2 types of option which are negative logic (stan-
dard model) and positive logic (/P Option).
a） Negative Logic (Standard Model)
b） Positive Logic (/P Option)
●For standard model, when control function is not used,
●When using long wiring, for prevention of noise, attach a
●At L level, maximum source current from CNT Terminal
●The maximum CNT Terminal voltage when it is opened
●When the voltage at CNT pin is between 0.8V and 2V,
 Operating Ambient Temperature
The operating ambient temperature is from –40℃〜 85℃.
However, the output load should be derated accordingly
to the ambient temperature and airflow speed. (Refer to
Mounting Method & Thermal Condition). There is no re-
striction on mounting direction but there should be enough
consideration for airflow so that heat does not accumulate
around the power module vicinity.
Determine external components configuration and mount-
ing direction on PCB such that airflow through the power
module from force air or convection cooling is not blocked.
 Operating Ambient Humidity
Take note that moisture could lead to power module ab-
normal operation or damage.
CNT terminal is shorted to –Vin terminal.
0.1 μF capacitor between CNT Terminal and –Vin termi-
nal.
to –Vin terminal is 0.5mA.
is 6V.
the output voltage is undefined.
CNT Level to –Vin Terminal
H Level （H＞ − 2V） or Open
L Level（L＜ − 0.8V） or Short
CNT Level to –Vin Terminal
H Level （H＞ − 2V） or Open
L Level（L＜ − 0.8V） or Short
Fig.10-1 : CNT connection
FUSE
＋Vin
CNT
−Vin
Output Status
Output Status
OFF
OFF
ON
ON
B-255
PAQ