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参数资料
| 型号： | PT4801A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 3-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SIP-15 |
| 文件页数： | 5/9页 |
| 文件大小： | 182K |
| 代理商： | PT4801A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4801
Adjusting the Output Voltage of the PT4801
Triple-Output DC/DC Converter
The low-voltage outputs from the PT4801 triple-output
DC/DC converter, Vo2 (3.3V) and Vo3 (1.5V), can be
independently adjusted from the factory trimmed preset
value. Note that the primary use of this feature is for
margin testing of the on-board supply voltages. A per-
manent increase in output voltage is not advised 1. Also,
due to design limitations, Vo3 cannot be adjusted higher
than its nominal value.
To adjust each output, a single external resistor is added
to the circuit in either the “Adjust Up” or “Adjust Down”
position (See Figure 1) 2. Table 1 gives the allowable
adjustment range for each output as Va (min) and Va (max).
Vo2 Adjust Up: Add a resistor R2 between pin 12
(Vo2 Adj), and pin 11 (COM) 1.
Vo2 Adjust Down: Add a resistor (R1) between
pin 12 (Vo2 Adj), and pin 14 (Vo2).
Vo3 Adjust Up: Vo3 cannot be adjusted higher.
Vo3 Adjust Down: Add a resistor (R3) between pin 19
(Vo3 Adj), and pin 18 (Vo3).
Refer to Figure 1 and Table 2 for both the placement and
value of the adjust resistor.
Notes:
1. The high-side adjust range of the Vo2 output may be
limited by the input voltage and/or the load current
status of all three outputs. This situation would most
likely be encountered when Vo1 is lightly loaded and
either Vo2 or Vo3 is operating close to full load.
2. Use only a single 1% resistor in either the (R1) or R2
location to adjust Vo2, and in the (R3) location to
adjust Vo3. Place the resistor as close to the ISR as
possible.
3. Never connect capacitors to either of the output
adjust control pins. Any capacitance added to these
control pins will affect the stability of the respective
regulated output.
The adjust up and adjust down resistor values can be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
being adjusted.
(R1) or (R3) =
Ro (Va – Vr)
– Rs k
(Vo – Va)
R2 =
Ro Vr
– Rs k
(Va – Vo)
Where
Vo = Original output voltage
Va = Adjusted output voltage
Vr = Reference voltage (Table 1)
Ro = Multiplier resistor (Table 1)
Rs = Series resistance (Table 1)
Figure 1
+V
IN
–V
IN
Vo
1 (+15VDC)
Vo
2
Vo
3
PT4801
6, 7
3, 4
10
14, 15
18
16, 17
11
1
Vo
1
COM
Vo
2
Vo
3
+V
IN
–V
IN
Remote
On/Off
Vo
2adj
Vo
3adj
Co
1
Co
3
Co
2
C
IN
R
2
Adjust Up
(R
1)
Adjust
Down
(R
3)
Adjust
Down
12
19
COM
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