SLTS027B Datasheet, PDF (3/6 Pages) Texas Instruments – Single Device: 5V Input Complimentary Dual Output:

Application Notes
PT5060 Series
Adjusting the Output Voltage of the PT5060
Dual-Output Boost Converter Series
The dual output voltage of the PT5060 series modules
can be adjusted higher or lower than the factory pre-set
voltage with the addition of a single external resistor.
Table 1 gives the applicable adjustment range for each
model in the series as V_a (min) and V_a (max).
Adjust Up: An increase in the output voltage is obtained
by adding a resistor R₂, between pin 11 (V_o adj) and pins
2, 6, or 7 (GND).
Adjust Down: Add a resistor (R₁), between pin 11 (V_o adj)
and pins 8, 9 or 10 (Vo₁).
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. Both the positive and negative voltage outputs from the
ISR are adjusted simultaneously.
2. Use only a single 1% resistor in either the (R₁) or R₂
location. Place the resistor as close to the ISR as possible.
3. Never connect capacitors from V_o adj to either GND or
V_o. Any capacitance added to the V_o adjust pin will affect
the stability of the ISR.
4. An increase in the output voltage must be accompanied by
a corresponding reduction in the specified maximum
current at each output. For Vo₁ and –Vo₂, the revised
maximum output current must be reduced to the
equivalent of 6 watts and 3 watts respectively. i.e.
Io₁ (max)
=
6
V_a
Adc
and Io₂ (max) = 3 Adc,
V_a
where V_a is the adjusted output voltage.
5. Adjustments to the output voltage will also limit the
maximum input voltage that can be applied to the ISR.
The maximum input voltage that may be applied is limited
to (V_o – 1)Vdc or 14Vdc, whichever is less.
Figure 1
–Vo₂ ¹
V _in
3,4,5 _Vin
PT5060
+Vo₁ ^8,9,10
GND
Vo(adj)
2,6,7
11
(R₁)
Adj Down
COM
R₂
Adjust Up
–Vo₂
+Vo₁
C _out
+
1 0 0 µF
COM
The values of (R₁) [adjust down], and R₂ [adjust up], can
also be calculated using the following formulas.
(R₁)
=
3.65 (V_a – 2.5 )
(V_o – V_a)
- 0.1
kΩ
R₂
=
9.125 _{- 0.1}
V_a - V_o
kΩ
Where: V_o = Original output voltage
V_a = Adjusted output voltage
Table 1
PT5060 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT5061
PT5062
Vo (nom)
Va (min)
Va (max)
±12.0V
± 7.5V
±14.0V
±15.0V
± 7.5V
±20.0V
Table 2
PT5060 ADJUSTMENT RESISTOR VALUES
Series Pt #
Current
Vo(nom)
Va(req’d)
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
PT5061
0.5/0.25Adc
±12.0Vdc
(4.0)kΩ
(4.9)kΩ
(6.2)kΩ
(7.8)kΩ
(10.1)kΩ
(13.6)kΩ
(19.4)kΩ
(30.9)kΩ
(65.6)kΩ
18.2kΩ
9.0kΩ
6.0kΩ
4.5kΩ
R₁ = (Blue)
R₂ = Black
PT5062
0.4/0.2Adc
±15.0Vdc
(2.3)kΩ
(2.8)kΩ
(3.3)kΩ
(3.9)kΩ
(4.6)kΩ
(5.4)kΩ
(6.4)kΩ
(7.7)kΩ
(9.3)kΩ
(11.5)kΩ
(14.5)kΩ
(19.1)kΩ
(26.7)kΩ
(41.9)kΩ
(87.5)kΩ
18.2kΩ
9.0kΩ
6.0kΩ
4.5kΩ
3.6kΩ
2.9kΩ
2.5kΩ
2.2kΩ
1.9kΩ
1.7kΩ
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