PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 37

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

・All specifications are subject to change without notice.
PAF
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 =
For applications other than the above, refer to the trim circuit
below and determine external circuit and component values.
3 Maximum Output Power
Maximum output power for each output voltage is as fol-
lows.
When output voltage is adjusted, output power can be sup-
plied within maximum rated output current.
Reference：1.8V output voltage module.
Error Amplifier
Fig.2-4 Example Connection of External Resistor
1.225V
Reference
Voltage
r1
＋S
＋V
−V
−S
TRIM
＋S
＋V
−V
−S
TRIM
7.32kΩ
400F280
Fig.2-5 Output Voltage Adjustment by
Fig.2-6 TRIM Circuit (For the Reference)
TRIM Terminal Voltage×Nominal Output Voltage
If adjust to 2.4V, 100A (240W) can be drawn.
If output voltage is more than above value, need
to derate the output current accordingly.
32.4kΩ
External
Voltage
applying external voltage
Maximum Output Power
1.8V
0.8k
R1
−
＋
VR
1.8V : 240W
3.3V : 390W
5V : 450W
3.3V
2.3k
1kΩ
Load
r1
＋
−
＋
−
Load
4.0k
5V
＋S
−S
TRIM
4 Maximum Ripple and Noise
Measure according to the specified methods based on
JEITA RC-9141 (Clause 7.12 and clause 7.13) which is
described in the following.
Connect according to Fig.4-1 and measure. Connect
capacitors (C6: ceramic capacitor, C7-C11: electrolytic
capacitor) at 50mm distance from the output terminals.
Measure at ceramic capacitor (C6) leads as shown in
Fig.4-1 using coaxial cable with JEITA attachment. Use
oscilloscope with 100MHz frequency bandwidth or equivalent.
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.
5 Maximum Line Regulation
Maximum value of output voltage change when input voltage
is gradually varied (steady state) within specified input voltage
range.
6 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 may 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.
7 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 at
continuous output short circuit or over load conditions de-
pending on thermal conditions.
8 Over Voltage Protection(OVP , OVPALM, OVTRM terminal)
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 lowering the
input voltage below the voltage value indicated below.
Fig.4-1 Measurement of Maximum Output Ripple & Noise
OVP release input voltage value: 40VDC and below
＋V
−V
50mm
C6
+
C7-C11
1.5m 50Ω
Coaxial Cable
As short as possible
Load
R
C
Oscilloscope
JEITA
Attachment
R:50Ω
C:4700pF
B-129
PAF