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參數(shù)資料
| 型號： | PT3303A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, SMA19 |
| 封裝： | SIP-19 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 247K |
| 代理商： | PT3303A |
For assistance or to order, call (800) 531-5782
3
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Application
Notes
PT3300 Series
pt5040
Adjusting the Output Voltage of the
PT3300 Wide Input Range Switching Regulator
The output voltage of the Power Trends PT3300 Series ISRs
may be adjusted over a ±10% range from the factory trimmed
pre-set voltage. This is accomplished with the addition of a
single external resistor. Table 1 accordingly gives the allowable
adjustment range for each model in the series as Va (min) and
Va (max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 3 (Vo adjust) and pins 10-13
(Vo GND)
Adjust Down:
Add a resistor (R1), between pin 3 (Vo adjust)
and pins 14-17 (Vout).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
Notes:
1. Use only a single 1% resistor in either the (R1) or R2 loca-
tion. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from Vo adjust to either GND or
Vout . Any capacitance added to the Vo adjust pin will affect
the stability of the ISR.
3. Vin GND and Vo GND are connected internally and may
be treated as common on the PT3300 ISR series.
4. If the Remote Sense feature is being used, connecting the
resistor (R1) between pin 3 (Vo adjust) and pin 19 (Remote
Sense) can benifit load regulation.
5. Adjusting Vout higher than that defined for the model raises
the minimum input voltage by the same percentage.
Figure 1
The values of (R1) [adjust down], and R2 [adjust up], can also be
calculated using the following formulae.
Ro (Vo – 1)(Va – 1)
(R1)
=
(Vo – Va)
- 0.48
k
Ro (Vo – 1)
R2
=
Va - Vo
- 0.48
k
Where:
Vo
= Original output voltage
Va
= Adjustd output voltage
Ro
= The value in Table 1
Table 2
PT3300 ADJUSTMENT RESISTOR VALUES
Series Pt #
PT3301
PT3302
PT3303
PT3304
Current
8Adc
6Adc
2.5Adc
2Adc
Vo(nom)
3.3Vdc
5.0Vdc
12.0Vdc
15.0Vdc
Va(req’d)
3.0
(363.0)k
3.1
(572.0)k
3.2
(1200.0)k
3.3
3.4
545.0k
3.5
272.0k
3.6
181.0k
4.5
(383.0)k
4.6
(493.0)k
4.7
(675.0)k
4.8
(1040.0)k
4.9
(2140.0)k
5.0
5.1
548.0k
5.2
274.0k
5.3
182.0k
5.4
137.0k
5.5
109.0k
10.8
(448.0)k
11.0
(548.0)k
11.2
(699.0)k
11.4
(951.0)k
11.6
(1450.0)k
12.0
12.2
274.0k
12.4
137.0k
12.6
91.0k
12.8
68.1k
13.0
54.4k
13.2
45.3k
13.5
(425.0)k
14.0
(664.0)k
14.5
(1379.0)k
15.0
15.5
102.0k
16.0
50.6k
16.5
33.6k
R1 = (Red)
R2 = Black
(R1)
Adj Down
R2
Adjust Up
C
out
330
F
+
V
out
COM
V
in
COM
C
in
100
F,
100V
(Optional)
+
PT3300
3
4, 5, 6
7,8,9
Vin
V o
Vin GND
Vo(adj)
INH
2
Vo ( Sense )
19
10 - 13
Vo GND
14 - 17
L
O
A
D
Table 1
PT3300 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT3301
PT3302
PT3303
PT3304
Vo (nom)
3.3V
5.5V
12.0V
15.0V
Va (min)
3.0V
4.5V
10.8V
13.5V
Va (max)
3.6V
5.5V
13.2V
16.5Vs
Ro (k
)
23.7
13.7
4.99
3.65
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