(1) ISR-will operate down to no load with reduced specifications.
(2) See Safe Operating Area curves, or consult the factory for the appropriate derating.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6910 Series
12 Watt 5V/3.3V Input
Plus to Minus Voltage Converter
Typical Characteristics
5.0V Input Voltage
Efficiency vs Output Current
90
(See Note A)
90
3.3V Input Voltage
Efficiency vs Output Current
(See Note A)
80
80
Efficiency - %
70
60
PT6912
PT6911
PT6913
Efficiency - %
70
PT6915
PT6914
60
50
40
0
1
2
3
4
5
6
50
0
1
2
3
4
5
Iout (A)
Iout (A)
Power Dissipation vs Output Current
8
Power Dissipation vs Output Current
8
6
6
Pd - Watts
4
PT6912
PT6911
PT6913
Pd - Watts
4
PT6915
PT6914
2
2
0
0
1
2
3
4
5
6
0
0
1
2
3
4
5
Iout (A)
50
Iout (A)
Ripple vs Output Current
Ripple vs Output Current
40
40
30
Ripple - mV
30
20
PT6912
PT6911
PT6913
Ripple - mV
20
PT6915
PT6914
10
10
0
0
1
2
3
4
5
6
0
0
1
2
3
4
5
Iout (A)
Iout (A)
PT6911 Safe Operating Area, Vin =5.0V
90.0
80.0
(See Note B)
PT6912 Safe Operating Area, Vin =5.0V
90.0
80.0
(See Note B)
Ambient Temperature (°C)
Ambient Temperature (°C)
70.0
60.0
50.0
40.0
30.0
20.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Airflow
200LFM
120LFM
60LFM
Nat conv
70.0
60.0
50.0
40.0
30.0
20.0
0.0
1.0
2.0
3.0
4.0
Airflow
200LFM
120LFM
60LFM
Nat conv
Iout (A)
Iout (A)
Note A:
All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter.
Note B:
SOA curves represent the condition at which internal com-ponents are at or below manufacturere’s maximum operating temperature.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT6900/6910 Series
Adjusting the Output Voltage of the PT6900/PT6910
Positive to Negative Converter Series
The negative output voltage of the Power Trends PT6900
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 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 2 (V
o
adjust) and
pin 8 (Remote Sense GND).
Adjust Down:
Add a resistor (R1), between pin 2 (V
o
ad-
just) and pin 22 (Remote Sense V
o
).
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. Only a single 1% resistor is required in either the
(R1)
or
R2 location. Do not use
(R1)
and R2 simultaneously.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
o
adjust to either GND,
V
out
, or the Sense pins. Any capacitance added to the
V
o
adjust pin will affect the stability of the ISR.
3. If the sense pins are not being used, the resistors
(R1)
and
R2 can be connected to V
out
and GND respectively.
4. An increase in the output voltage must be accompanied by
a corresponding reduction in the maximum output current.
The revised maximum output current must be reduced to
the equivalent of 12Watts.
i.e.
I
out
(max)
=
12
V
a
Adc,
Figure 1
22
Vo(sense)
3-7
16 - 21
+Vin
+Vin
PT6900/10
GND
Vo(adj)
2
-Vo
Vout(-)
GND(sense)
8
9 - 15
(R1)
(Down)
C
out
+
R2
(Up)
COM
The respective values of
(R1)
[adjust down], and R2 [ad-
just up], can also be calculated using the following formulas.
(R1)
=
24.9 (V
a
– V
r
)
– R
s
kΩ
(V
o
– V
a
)
24.9 V
r
– R
s
(V
a
– V
o
)
kΩ
R2
=
Where:
V
o
V
a
V
r
R
s
= Original output voltage
= Adjusted output voltage
= Reference voltage in Table 1
= The resistance given in Table 1
where V
a
is the adjusted output voltage.
Table1
PT6900/PT6910 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
5.0V Bus
3.3V Bus
Vo (nom)
Va (min)
Va (max)
Vr
Rs (kΩ )
Ω
PT6903/13
-1.5V
-1.2V
-3.4V
-1.0V
12.7
PT6901/11
PT6904/14
-2.0V
-1.4V
-4.5V
-1.0V
10.0
PT6902/12
PT6905/15
-5.2V
-2.7V
-6.5V
-0.92V
17.4
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
+
C
in
L
O
A
D
COM
Application Notes
continued
PT6900/6910 Series
Table 2
PT6900/PT6910 ADJUSTMENT RESISTOR VALUES
Series Pt #
5.0V Bus
3.3V Bus
V
o
(nom)
V
a
(req’d)
–1.2
–1.3
–1.4
–1.5
–1.6
–1.7
–1.8
–1.9
–2.0
–2.1
–2.2
–2.3
–2.4
–2.5
–2.6
–2.7
–2.8
–2.9
–3.0
–3.1
–3.2
–3.3
–3.4
–3.5
–3.6
–3.7
–3.8
R1 =
(Blue)
R2 = Black
236.0kΩ
112.0kΩ
70.3kΩ
49.6kΩ
37.1kΩ
28.8kΩ
22.9kΩ
18.4kΩ
15.0kΩ
12.2kΩ
9.9kΩ
8.1kΩ
6.5kΩ
5.1kΩ
3.9kΩ
2.9kΩ
2.0kΩ
1.1kΩ
0.4kΩ
239.0kΩ
115.0kΩ
73.0kΩ
52.3kΩ
39.8kΩ
31.5kΩ
25.6kΩ
21.1kΩ
17.7kΩ
14.9kΩ
12.6kΩ
10.8kΩ
9.2kΩ
7.8kΩ
6.6kΩ
5.6kΩ
4.7kΩ
3.8kΩ
(0.3)kΩ
(2.1)kΩ
(4.0)kΩ
(6.1)kΩ
(8.5)kΩ
(11.0)kΩ
(13.8)kΩ
(16.9)kΩ
(20.4)kΩ
(24.3)kΩ
(28.7)kΩ
(33.8)kΩ
PT6903/13
–1.5Vdc
(3.9)kΩ
(24.7)kΩ
(86.9)kΩ
(6.6)kΩ
(14.9)kΩ
(27.4)kΩ
(48.1)kΩ
(89.6)kΩ
(214.0)kΩ
PT6901/11
PT6904/14
–2.0Vdc
PT6902/12
PT6905/15
–5.2Vdc
Series Pt #
5.0V Bus
3.3V Bus
V
o
(nom)
V
a
(req’d)
–3.9
–4.0
–4.1
–4.2
–4.3
–4.4
-4.5
–4.6
–4.7
–4.8
–4.9
–5.0
–5.1
–5.2
–5.3
–5.4
–5.5
–5.6
–5.7
–5.8
–5.9
–6.0
–6.1
–6.2
–6.3
–6.4
–6.5
212.0kΩ
97.1kΩ
59.0kΩ
39.9kΩ
28.4kΩ
20.8kΩ
15.3kΩ
11.2kΩ
8.1kΩ
5.5kΩ
3.4kΩ
1.7kΩ
0.2kΩ
PT6901/11
PT6904/14
–2.0Vdc
3.1kΩ
2.5kΩ
1.9kΩ
1.3kΩ
0.8kΩ
0.4kΩ
0.0kΩ
PT6902/12
PT6905/15
–5.2Vdc
(39.7)kΩ
(46.5)kΩ
(54.6)kΩ
(64.3)kΩ
(76.1)kΩ
(90.9)kΩ
(106.0)kΩ
(135.0)kΩ
(171.0)kΩ
(224.0)kΩ
(313.0)kΩ
(491.0)kΩ
(1020.0)kΩ
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
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