PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 20

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

PAF
B-112
PAF
age is gradually varied (steady state) within specified input
voltage range.
5 Maximum Load Regulation
Maximum value of output voltage change when output cur-
rent is gradually varied (steady state) within specified out-
put current range.
When using at dynamic load mode, audible noise could be
heard from the power module and output voltage fluctua-
tion might increase. A thorough pre-evaluation must be
performed before using this power module.
6 Over Current Protection (OCP)
This power module has built-in OCP function.
Output will recover when short circuit or overload condi-
tions are released. OCP setting value is fixed and there-
fore, cannot be externally adjusted.
Also, take note that power module might be damaged con-
tinuing output short circuit or over load conditions depend-
ing on thermal conditions.
7 Over Voltage Protection (OVP)
This power module has built-in OVP function.
As this set point is fixed, so adjustment voltage from the
outside is impossible.
OVP set point is relative to the rated output voltage value.
When OVP is triggered, output can be recovered by turn-
ing input line off and then turning it on again after lowering
the input voltage below the voltage value indicated below,
or by manual reset of the control ON/OFF terminal. Reset
time for ON/OFF terminal is 100ms or longer.
When verifying OVP function by applying external voltage
at the output terminals, applied voltage value should not
exceed specified OVP maximum value. Refer to specifica-
tion table for OVP maximum value. Avoid applying external
voltage that exceeds OVP maximum value because this
will cause power module damage.
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.
OVP release input voltage value : 5VDC and below
500F24
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.
 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.
Maximum source current for ON/OFF terminal is 5mA.
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.
＋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
・All specifications are subject to change without notice.
+
Load
Load
＋
−
＋
−