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參數(shù)資料
| 型號(hào)： | PT4313C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SMD-9 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 226K |
| 代理商： | PT4313C |
Application Notes
For technical support or further information, visit http://power.ti.com
(R1)
Adj Down
R2
Adjust Up
(R3)
31.6k
(VR1), 5.1V
MM3Z5V1
+V
IN
–V
IN
PT4310
Vo
1 ( + )
+Vin
-Vin
±Vo
Adjust
11
17
18
1
2
3
COM
Remote
On/Off
12
Vo
2 ( – )
Note: (R3) and (VR1) are only
required with (R1), for adjusting
the output down.
PT4310 Series
Adjusting the Output Voltage of the PT4310
Series of Isolated DC/DC Converters
The PT4310 is a series of 6-watt isolated dual-output
DC/DC converters. The PT4310 series is functionally
similar and pin-compatible with the former PT4300 series,
but the adjustment of the output voltages is different 1.
The ±Vo output voltages of the PT4310 series may be
adjusted higher or lower than the factory trimmed value.
The adjustment method uses a single external resistor to
adjust the magnitude of both output voltages by as much
as ±5%. When adjusting the output voltages to a lower
value, an external bias voltage, referenced to the –Vin
(primary), is also required. 2
Figure 1-1 gives a suggested schematic for the PT4310
output voltage adjustment. The components (R3) and
(VR1) are only required with (R1). 3
Adjust Up:
Add a resistor, R2, between Vo Adjust (pin 12)
and –Vin (pin 17).
Adjust Down:
An increase in the ±Vout output voltages is
obtained by adding a resistor, (R1), between Vo Adjust
(pin 12) and a +5 VDC external voltage source. The
voltage source must be referenced to –Vin (pin 17). A
simple external voltage source may be implemented by
adding the components (R3) and (VR1) in Figure 1-1.
Refer to Table 1-1 for the value of the external adjust
resistors, R2, or (R1) required to adjust each model of the
PT4310 series, up or down respectively by the stated
percentage. See Figure 1-1 for the placement of (R1),
R2, and other components.
DC/DC CONVERTER ADJUSTMENT RESISTOR VALUES
Series Pt #
PT4311
PT4313
PT4314
Vo (nom)
±5 V
±12 V
±24 V
(Io1+|Io2|)max 4
1.2 A
0.5 A
0.25 mA
|±Vo|% Adjust
–5.0%
(90.9 k
)
(0 k
)
(220 k
)
–2.5%
(750 k
)
(511 k
)
(950 k
)
0.0%
+2.5%
750 k
511 k
950 k
+5.0%
90.9 k
0 k
220 k
R1 = (Blue)
R2 =Black
Figure 1-1
Table 1-1
Notes
1. In most stand-alone applications the PT4310 series is a
direct substitute for the PT4300 series. However, the
method of output voltage adjustment differs between
the two series. For existing applications that use a
PT4300 part, a modification to the circuit will be
necessary if the output voltage is required to be
adjusted to a value other than the pre-trimmed factory
setting.
2. The adjustment control input, Vo Adjust (pin 12) is
referenced to –Vin (pin 17).
3. (R3) and (VR1) provide a +5 VDC external bias voltage
that is required for (R1) to adjust the output voltages
down. If the outputs are to be adjusted up, only the R2
is required.
4. The PT4310 series is rated for 6 watts total output.
An increase in the output voltage will require a
corresponding reduction in the maximum allowed
total output current (Io1 +Io2) max in Table 1-1.
The total current from both outputs must comply
with the following equation:-
Io1 +Io2 =
6
Adc
or (Io1 +Io2)max,
Va
whichever is less.
Where,
Va = the new (adjusted) output voltage.
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