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参数资料
| 型号： | PT6981N |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 10.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, SMA23 |
| 封装： | VERTICAL THROUGH HOLE-23 |
| 文件页数： | 13/13页 |
| 文件大小： | 295K |
| 代理商： | PT6981N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of the PT6980
Dual-Output Voltage Regulators
Each output voltage from the PT6980 series of integrated
switching regulators (ISRs) can be independently adjusted
higher or lower than the factory trimmed pre-set voltage.
The voltages, Vo1 and Vo2 may be adjusted either up or
down using a single external resistor 1. Table 1 gives the
adjustment range for both Vo1 and Vo2 for each model in
the series as Va(min) and Va(max). Note that Vo2 must
always be lower than Vo1 2.
Vo1 Adjust Up: To increase the output, add a resistor R4
between pin 16 (V1 Adjust) and pins 7-11 (GND) 1.
Vo1 Adjust Down: Add a resistor (R3), between pin 16
(Vo1 Adjust) and pin 1 (Vo1 Sense) 1.
Vo2 Adjust Up: Add a resistor R2 between pin 23
(Vo2 Adjust) and pins 7-11 (GND) 1.
Vo2 Adjust Down: Add a resistor (R1) between pin 23
(Vo2 Adjust) and pin 22 (Vo2 Sense) 1.
Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.
Notes:
1. Use only a single 1% resistor in either the (R3) or R4
location to adjust Vo1, and in the (R1) or R2 location to
adjust Vo2. Place the resistor as close to the ISR as
possible.
2. Vo2 must always be at least 0.2V lower than Vo1.
Figure 1
C
1
+
C
2
+
C
3
+
R4
(R3)
(R1)
R2
L
O
A
D
L
O
A
D
Adj Down
Adjust Up
V
IN
COM
Vo
2
Vo
1
PT6980
18 - 21
23
7 - 11
4,5,6
Vin
Vo
2
GND
Vo
2 (adj)
Vo
1 (sns)
1
16
Vo
1 (adj)
12 - 15
Vo
1
Vo
2 (sns)
22
STBY
3
Adjust Vo
1
Adjust Vo
2
3. Both the Vo1 and Vo2 may be adjusted down to an
alternative bus voltage by making, (R3) or (R1)
respectively, a zero ohm link. Refer to the Table 1
footnotes for guidance.
4. Never connect capacitors to either the Vo1 Adjust or
Vo2 Adjust pins. Any capacitance added to these control
pins will affect the stability of the respective regulated
output.
5. Adjusting either voltage (Vo1 or Vo2) may increase the
power dissipation in the regulator, and change the
maximum current available at either output. Consult
the note on p.2 of the data sheet regarding Vo1/Vo2
loading.
The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
and model being adjusted.
(R1) or (R3)
=
10 (Va – Vr )
– Rs
k
Vo – Va
(R2) or (R4)
=
10 Vr
– Rs
k
Va – Vo
Where: Vo = Original output voltage, (Vo1 or Vo2)
Va = Adjusted output voltage
Vr = The reference voltage from Table 1
Rs = The series resistance from Table 1
PT6980 Series
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