PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 47

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

・All specifications are subject to change without notice.
PAF
External Resistor ： Below±5% Tolerance
Variable Resistor ： Below±20% Tolerance below 1% Remain
External Resistor ：Below±5% Tolerance
Variable Resistor ：Below±20% Tolerance
Output Voltage Adjustment by applying external voltage
By applying external voltage at the TRIM terminal, output
voltage can be adjusted within the same output voltage
adjustment range as the output voltage adjustment by
external resistor or variable resistor. For this case, output
voltage can be determined by the formula shown below.
Output Voltage = TRIM Terminal Voltage×Nominal Output
For applications other than the above, refer to the trim cir-
cuit as shown in fig.2-4 and determine external circuit and
component values.
Table2-1 Values of External Resistor and Variable Resistor
Table2-2 Values of External Resistor and Variable Resistor
R1
VR
R1
VR
Fig.2-2 Example Connection of External Resistor
450F280, 600F280
Fig.2-4 TRIM Circuit (For the Reference)
Error Amplifier
Fig.2-3 Output Voltage Adjustment by
＋S
＋V
−V
−S
TRIM
＋S
＋V
−V
−S
TRIM
Reference
Voltage
1.225V
6.8k
7.32kΩ
12V
12V
20k
43k
5k
−40% ～ ＋20% Variable
Below 1% Remain
External
Voltage
±10% Variable
32.4kΩ
R1
VR
Voltage
6.8k
24V
24V
−
＋
50k
43k
10k
applying external voltage
6.8k
28V
28V
1kΩ
50k
43k
10k
＋
−
Load
＋
−
Load
＋S
−S
TRIM
Unit : [Ω]
Unit : [Ω]
100k
6.8k
48V
48V
43k
20k
3 Maximum Output Ripple and Noise
Measured value according to the specified methods based
on JEITA-9141 (Clause 7.12 and clause 7.13) which is de-
scribed in the following.
Measure according to fig.3-1 connection, based on the ba-
sic connection of fig.1-2. Connect capacitors (C6: ceramic
capacitor 2.2μF, C7: refer to table 1-1 for electrolytic
capacitor values) at 50mm distance from the output termi-
nals. Measure at ceramic capacitor (C6) leads as shown
in fig.3-1 using coaxial cable with JEITA attachment. Use
oscilloscope with 100MHz frequency bandwidth or equiva-
lent.
Take note that output ripple voltage and output spike noise
may vary depending on PCB wiring design.
Generally, output ripple voltage and output spike noise can
be reduced by increasing capacitance value of external
capacitor.
4 Maximum Line Regulation
Maximum value of output voltage change when input volt-
age is gradually varied (steady state) within specified input
voltage range.
5 Maximum Load Regulation
Maximum value of output voltage change when output
current is gradually varied (steady state) within specified
output 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.
OVP set point is relative to the rated output voltage value.
When OVP is triggered, output can be recovered by turning
input line off and then turning it on again after input voltage
drops down to 0V, 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 specification table
for OVP maximum value. Avoid applying external voltage that
exceeds OVP maximum value because this will cause power
module damage.
OVP setting value is fixed and cannot be adjusted externally.
Fig.3-1 Measurement of Maximum Output Ripple & Noise
＋V
−V
50mm以下
C6
+
C7
Coaxial Cable
1.5m 50Ω
As short as possible
Load
R
C
Oscilloscope
JEITA Attachment
R:50Ω
C:4700pF
B-139
PAF