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參數(shù)資料
| 型號(hào)： | PT5527N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, SMA5 |
| 封裝： | SIP-5 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大小： | 178K |
| 代理商： | PT5527N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5500/5520 Series
Adjusting the Output Voltage of the PT5500/20
Series of Excalibur
Step-Down ISRs
The output voltage of both the PT5500 and PT5520
series ISRs may be adjusted higher or lower than the
factory trimmed pre-set voltage with the addition of a
single external resistor. Table 1 accordingly gives the
allowable adjustment range for each model for either
series as Va (min) and Va (max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 5 (Vo adj) and pin 3 (GND).
Adjust Down:
Add a resistor (R1), between pin 5 (Vo adj) and
pin 4 (Vout).
Figure 1
The values of (R
1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas. Refer to
Figure 1 and Table 2 for both the placement and value of the
required resistor; either (R
1) or R2 as appropriate.
(R1)
=
Ro (Va – 0.9)
– Rs
k
Vo – Va
R2
=
0.9 Ro
– Rs
k
Va – Vo
Where:
Vo = Original output voltage
Va = Adjusted output voltage
Ro = The resistance value from Table 1
Rs = The series resistance from Table 1
Table 1
ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS
3.0 Adc Rated
PT5501
PT5502
PT5503
PT5504
PT5505
PT5506
PT5507
1.5 Adc Rated
PT5521
PT5522
PT5523
PT5524
PT5525
PT5526
PT5527
Vo (nom)
3.3
2.5
2.0
1.8
1.5
1.2
1.0
Va (min)
2.88
1.97
1.64
1.5
1.3
1.08
0.97
Va (max)
3.5
2.95
2.45
2.25
1.95
1.65
1.45
Ro (k
)
10.0
10.2
Rs (k
)
49.9
20.0
R2
Adjust Up
C1
1
F Ceramic
(Optional)
C2
100
F
(Req'd)
+V
O
COM
+V
IN
+
(R1)
Adj Down
PT5500
2
35
4
Vin
V o
Vo(adj)
GND
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from Vo adj to either GND or
Vout. Any capacitance added to the Vo adjust pin will
affect the stability of the ISR.
3. For each model, adjustments to the output voltage may
place additional limits on the minimum input voltage.
The revised minimum input voltage must comply with the
following requirement.
Vin(min) = (Va + 0.5)V or as specified in the data sheet,
whichever is greater.
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