PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 38

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

PAF
B-130
PAF
To verify OVP function, use output voltage trimming function
to increase the output voltage.
Do not apply
the OVP function. This might cause power module damage.
Remote sensing function
OVP function has remote sensing function. With connect-
ing the OVP terminal as shown in Fig.8-1
C13 : 0.47μF
For stable operation, connect film capacitor between +V
and +S at 50mm distance from the output terminals.
OVP value at sensing point (OVP, -S) in connecting the
OVP terminal.
1.8V: 2.16V - 2.34V
3.3V: 3.795V - 4.125V
5V:
OVP setting adjustment method
By connecting the external resistor or applying external
voltage, OVP setting value can be adjusted within the
range described in below table.
When OVP setting value is not changed, be sure to open
OVTRM terminal
The external resistor is connected between OVTRM and
-S as shown in Fig.8-2
Formula for determining OVP setting value (Vovp : TYP
value) by external resistor (R3) connection is shown below.
Vovp ：
Vref ：
r2 - r5 ： Internal Output Voltage Detecting resistor
(Refer to below table)
1.8V
3.3V
Fig.8-2 Example Connection of External Resistor
5V
Vovp=Vref・
400F280
OVTRM
＋S
＋V
−V
−S
OVP
＋S
＋V
−V
−S
OVP Setting Value
Internal Reference Voltage (TYP 1.225V)
Table 8-1 OVP Setting Value
(*At Output Terminal)
external voltage to output terminals to verify
OVP terminal
1.0V-2.8V
2.5V-4.5V
3.3V-6.3V
Fig.8-1 connection
OPEN
R2
C13 0.47μF
r2+R2
R2
5.75V - 6.25V
・
(r3+r4+r5)
(*At Sensing Terminal)
r5
Load
＋
−
OVP terminal
CONNECT
1.0V-2.2V
2.5V-3.8V
3.3V-5.8V
Load
＋
−
*OVP trip point
When OVP setting value is adjusted by the OVP terminal,
calculate OVP setting value with r3=0.
Also, equation for determining external resistor (R2) value
(TYP value) to set OVP voltage value (Vovp) arbitrarily
within the above range is shown below.
Graph representation of the above formulae is shown in
Fig.8-3 - Fig.8-5.
Resistor value calculated from this formula is a typical
value. When using this function, verify that OVP functions
properly triggered at the setting value by raising output
voltage using TRIM terminal.
Fig.8-4 OVP Setting Voltage – R2 Resistor Value in 3.3V
Fig.8-5 5 OVP Setting Voltage – R2 Resistor Value in
Fig.8-3 OVP Setting Voltage – R2 Resistor Value in
2.5
1.5
2.5
0.5
1.5
2.5
0.5
1.5
0.5
4.5
3.5
4.5
2.5
3.5
4.5
2.5
3.5
2.5
6.5
5.5
6.5
4.5
5.5
3.5
6.5
4.5
5.5
3.5
4.5
3.5
r2
r3
r4
r5
3
2
3
1
2
3
0
1
2
0
1
0
5
4
5
3
4
5
2
3
4
2
3
2
6
5
6
4
5
3
6
4
5
3
4
Table 8-2 r1 ～ r4 Resistor Value (TYP Value)
10
10
10
10
10
10
10
10
2
2
2
2
2
2
2
2
(TYPValue)
5V(TYP Value)
1.8V(TYP Value)
R2=
1.8V
6.8k
8.2k
10k
10
10
10
10
10
10
10
10
Vref・ （r3+r4+r5）−Vovp・r5
1k
Open
Open
Open
3
3
3
3
3
3
3
3
Open
Open
Open
Open
Open
Open
・All specifications are subject to change without notice.
R2 (Ω)
R2 (Ω)
R2 (Ω)
R2 (Ω)
R2 (Ω)
R2 (Ω)
R2 (Ω)
R2 (Ω)
r2・r5・Vovp
10
10
10
10
10
10
10
10
4
4
4
4
4
4
4
4
Connect
Connect
Connect
Connect
Connect
Connect
Connect
Connect
Connect
3.3V
6.8k
22k
10k
1k
10
10
10
10
10
10
10
10
5
5
5
5
5
5
5
5
6.8k
Unit： ［Ω］
39k
10k
5V
1k
10
10
10
10
10
10
10
10
6
6
6
6
6
6
6
6