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PT6442 Datasheet(PDF) 5 Page - Texas Instruments

Part # PT6442
Description  6A Output Current
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PT6442 Datasheet(HTML) 5 Page - Texas Instruments

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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6440 Series
Adjusting the Output Voltage of the PT6440
Excalibur
 5V/3.3V Bus Step-Down ISRs
The output voltage of the PT6440 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 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 Vo Adj (pin 12) and GND
(pins 5–8).
Adjust Down:
Add a resistor (R1), between Vo Adj (pin 12)
and Vout (pins 9–11).
Figure 1
The values of (R1) [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 (R1) 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
Series Pt. #
PT6441
PT6442
PT6443
PT6444
PT6445
PT6446
PT6447
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 (kΩ
Ω)
10.0
10.0
10.0
10.0
10.0
10.0
10.2
Rs (k
Ω)
49.9
20.0
20.0
20.0
20.0
20.0
20.0
R
2
Adjust Up
C
2
+V
O
COM
COM
+V
IN
+
(R
1)
Adj Down
PT6440
2,3,4
5–8
12
9,10,11
Vin
Vo
Vo(adj)
GND
C
1
+
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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