PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 30

• Manufacturer Part Number: PAF600F280-28
• Description: 28V@21.5A
• Manufacturer: TDK Corporation

PAF
B-122
PAF
OVP circuit monitors output voltage from the output termi-
nals. Therefore, for cases where remote sensing function
is used together, consider voltage drop from the power
module output terminals to the load input terminals when
setting OVP value.
Output voltage of the power module transitionally changes
when output load or input voltage suddenly change. For
this case, set enough margin for output voltage peak when
setting OVP value.
Be sure to verify beforehand that OVP does not falsely
trigger at actual evaluation for worst output load or input
voltage conditions
8 Over Thermal Protection
This power module has built-in OTP function. This function
operates and shuts down the output when ambient temper-
ature or internal temperature of power module abnormally
rises. OTP operates at 105℃ to 130℃ baseplate tempera-
ture. Output shutdown due to OTP can be released when
baseplate temperature drops down approximately to within
80℃ to 95℃ . However, take note that OTP will operate
again unless the cause of abnormal heat of the power
module is eliminated.
9 Remote Sensing (+S, -S terminal)
Remote sensing terminal is provided to compensate for
voltage drop across the wirings from the power module
output terminal to the load input terminal.
When remote sensing function is not used (local sensing),
short +S terminal to +V terminal and, -S terminal to –V ter-
minal.
Take note that voltage compensation range for line drop
(voltage drop due to wiring) is determined such that out-
put voltage at the output terminals is within output volt-
age range and that voltage between –V and –S terminals
is within 2V or less. Even for remote sensing case, use
power module such that output power is within specified
maximum output power. Furthermore, reduce noise effect
by using shielded wire, twisted pair, or parallel pattern.
500F48, 600F48, 700F48
＋S
＋V
−V
−S
＋S
＋V
−V
−S
Fig.9-2 Remote Sensing Not in Use
Fig.9-1 Remote Sensing at Use
Stabilize the output voltage at
load terminal
+
+
Stabilize the output voltage at
output terminal
+
Load
Load
＋
−
＋
−
 ON/OFF Control(+ON/OFF, -ON/OFF terminal)
Output can also be turned ON/OFF even without turning
the input line ON/OFF. An ON/OFF control circuit is pro-
vided which is isolated from the input side as well as the
output side.（Isolation withstand voltage: 1.5kVDC） .
Connection of ON/OFF terminal is as follows. As shown in
the figure below, output voltage turns ON when current is
made to flow through ON/OFF terminal. ON/OFF terminal
can be controlled by opening or closing connections (with
switch or relay), or by photo-coupler ON/OFF.
Therefore, set current limiting resistor value such that this
maximum source current value is not exceeded. Also, the
allowable maximum reverse current flow is 10mA.
A. Controlling the ON/OFF terminal from the input side
B. Controlling the ON/OFF terminal from the output side
C. Controlling the ON/OFF terminal by an external power
If necessary connect a current limiting resistor R5 as
shown in fig.10-3.
Note）1. When wiring becomes long, connect a capacitor of
Maximum source current for ON/OFF terminal is 5mA.
Connect current limiting resistor R1 as shown in fig
10-1.
Connect the current limiting resistor R4 as shown in fig.
10-2.
supply
R1 Recommended Resistor Value: 30kΩ(1/2W)
R4 Recommended Resistor Value: 2kΩ(1/6W)
Fig.10-1 Connection of ON/OFF Control (A)
Fig.10-2 Connection of ON/OFF Control (B)
Fig.10-3 Connection of ON/OFF Control (C)
about 0.1 μF value between the +ON/OFF terminal
and -ON/OFF terminal at a nearest distance.
Fuse
ex.5V
I(ON/OFF)
C1
・All specifications are subject to change without notice.
R4
+
SW
R5
I(ON/OFF)
I(ON/OFF)
R1
−ON/OFF
AUX
＋ON/OFF
−S
1k
−ON/OFF
＋ON/OFF
−ON/OFF
＋Vin
−Vin
＋ON/OFF
1k
1k
PC
PC
PC