參數(shù)資料
型號(hào)： PT6121R
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDFM12
封裝： PLASTIC, SIP-12
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 706K
代理商： PT6121R
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
PT6100/6120/6210/6220/6300/6320 Series
Adjusting the Output Voltage of Power Trends’
Wide Input Range Bus ISRs
The output voltage of the Power Trends’ Wide Input Range
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 12 (Vo adjust) and pins 5-8
(GND).
Adjust Down:
Add a resistor (R1), between pin 12 (Vo adjust)
and pins 9-11(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.
4. Adjustments to the output voltage may place additional
limits on the maximum and minimum input voltage for the
part. The revised maximum and minimum input voltage
limits must comply with the following requirements. Note
that the minimum input voltage limits are also model depen-
dant.
Vin (max) = (8 x Va)V or *30/38V,
whichever is less.
*Limit is 30V when inhibit function is active.
PT6x0x/PT6x1x series:
Vin (min) = (Va + 4)V or 9V,
whichever is greater.
PT6x2x series:
Vo <10V;
Vin (min) = (Va + 2.0)V or 7.0V,
whichever is greater.
Vo ≥10V;
Vin (min) = (Va + 2.5)V
Figure 1
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
Ro (Va – 1.25)
(R1)
=
Vo – Va
k
1.25 Ro
k
R2
=
Va – Vo
Where: Vo = Original output voltage
Va = Adjusted output voltage
Ro = The resistance value fromTable 1
Table 1
ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS
1Adc Rated
PT6102
PT6101
PT6103
PT6122
PT6121
2Adc Rated
PT6213
PT6212
PT6214
PT6223
PT6222
3Adc Rated
PT6303
PT6302
PT6304
PT6323
PT6322
Vo (nom)
3.3
5.0
12.0
Va (min)
1.89
1.88
2.18
2.43
Va (max)
6.07
11.25
8.5
22.12
Ro (k
)
66.5
150.0
90.9
243.0
R2
Adjust Up
C1
1
F Ceramic
(Optional)
C2
100
F
(Req'd)
Vo
COM
Vin
+
(R1)
Adj Down
PT6100/6200/6300
9,10,11
12
5,6,7,8
2,3,4
Vin
V o
G N D
Vo(adj)
More Application Notes
相關(guān)PDF資料
PDF描述
PT6122B 1 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDFM12
PT6121B 1 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDFM12
PT6222B 2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDFM12
PT6222G 2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDFM12
PT6223R 2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDFM12
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