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參數資料
| 型號： | PT6921C |
| 英文描述： | SMPS Controller |
| 中文描述： | 開關電源控制器 |
| 文件頁數： | 3/7頁 |
| 文件大?。?/td> | 138K |
| 代理商： | PT6921C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6920/PT6930 Series
Adjusting the Output Voltage of the PT6920 and
PT6930 Dual Output Voltage ISRs
Each output voltage from the PT6920 and PT6930 series
of ISRs can be independantly adjusted higher or lower
than the factory trimmed pre-set voltage. V
(the voltage
at V
out), or V
(the voltage at V
out) may each be ad-
justed either up or down using a single external resistor
2
.
Table 1 gives the adjustment range for both V
and V
for
each model in the series as V
(min) and V
a
(max). Note
that V
2
must always be lower than V
1
3
.
V
Adjust Up:
R4 between pin 16 (V
1
Adjust) and pins 7-11 (GND)
2
.
To increase the output, add a resistor
V
1
Adjust Down:
(V
1
Adjust) and pin 1 (V
1
Remote Sense)
2
.
Add a resistor (R3), between pin 16
V
2
Adjust Up:
(V
2
Adjust) and pins 7-11 (GND)
2
.
Add a resistor R2 between pin 23
V
2
Adjust Down:
(V
2
Adjust) and pin 22 (V
2
Remote Sense)
2
.
Add a resistor (R1) between pin 23
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor.
Notes:
1. The output voltages, V
1
out and V
2
out, may be
adjusted independantly.
2. Use only a single 1% resistor in either the
(R3)
or R4
location to adjust V
, and in the
(R1)
or R2 location
to adjust V
2
. Place the resistor as close to the ISR as
possible.
3. V
2
must always be at least 0.2V lower than V
.
4. V
on both the PT6921 and PT6931 models may be
adjusted from 2.5V to 1.8V by simply connecting pin
22 (V
Remote Sense) to pin 23 (V
2
Adjust). For
more details, consult the data sheet.
Table 1
PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Output Bus
V
1
out
Series Pt #
Standard Case
PT6921/22
Excalibur Case
PT6931/32
Adj. Resistor
(R3)
/R4
V
2
out
PT6921
PT6931
(R1)
/R2
PT6922
PT6932
(R1)
/R2
Vo(nom)
Va(min)
Va(max)
Ro (k
)
Rs (k
)
3.3V
2.3V
3.6V
12.1
12.1
2.5V
1.8V
3.0V
10.0
11.5
1.5
1.2
3.0
9.76
6.49
Figure 1
C
1
+
C
2
+
C
3
+
R4
(R3)
(R1)
R2
L
O
A
D
L
O
A
D
Adj Down
Adjust Up
Vin
COM
COM
V2
out
V1
out
PT6920
18 - 21
23
7 - 11
4,5,6
Vin
V2
out
GND
Vo
2
(adj)
V
1
(sns)
1
16
Vo
1
(adj)
12 - 15
V1
out
V
2
(sns)
22
STBY
3
Adjust V1
out
Adjust V2
out
5. If V
is increased above 3.3V, the minimum input
voltage to the ISR must also be increased. The
minimum required input voltage must be (V
+ 1.2)V
or 4.5V, whichever is greater. Do not exceed 5.5V
6. Never connect capacitors to either the V
Adjust or
V
Adjust pins. Any capacitance added to these
control pins will affect the stability of the respective
regulated output.
7. Adjusting either voltage (V
or V
) may increase the
power dissipation in the regulator, and
correspondingly change the maximum current
available at either output. Consult the factory for
application assistance.
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.
R
o
(V
– 1)
V
o
– V
a
(R1) or (R3)
=
– R
s
k
R2 or R4
=
R
V
a
– V
o
– R
s
k
Where:
V
o
V
a
R
o
R
s
= Original output voltage, (V
1
or V
2
)
= Adjusted output voltage
= The resistance value from Table 1
= The series resistance from Table 1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PT6921N | 功能描述:DC/DC轉換器 3.3/2.5Vout 25W 5Vin Adj Dual Output ISR RoHS:否 制造商:Murata 產品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PT6922 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT INTEGRATED SWITCHING REGULATOR |
| PT6922A | 功能描述:開關變換器、穩(wěn)壓器與控制器 3.3/1.5Vout 25W 5Vin Adj Dual Output ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT6922C | 功能描述:開關變換器、穩(wěn)壓器與控制器 3.3/1.5Vout 25W 5Vin Adj Dual Output ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT6922N | 功能描述:開關變換器、穩(wěn)壓器與控制器 3.3/1.5Vout 25W 5Vin Adj Dual Output ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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