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參數(shù)資料
| 型號： | PT6985A |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開關穩(wěn)壓9V輸出 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 293K |
| 代理商： | PT6985A |
For technical support and more information, see inside back cover or visit www.ti.com
PT6980 Series
10-A 12V-Input Dual Output
Integrated Switching Regulator
Power-up Sequencing and Vo
1
/Vo
2
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Power-up Sequencing
The PT6980 series of regulators provide two output voltages,
Vo
1
and Vo
2
. Each of the output voltage combinations
offered by the PT6980 series provides power for both a low-
voltage processor core, and the associated digital support
circuitry. In addition, each output is internally sequenced
during power-up and power-down to comply with the
requirements of most DSP and μP IC’s, and their accompa-
nying chipsets. Figure 1 shows the typical waveforms of the
output voltages, Vo
1
and Vo
2
, from the instance that either
input power is applied or the module is enabled via the
Standby pin. Following a delay of about 25 milli-secs, the
voltages at Vo
1
and Vo
2
rise together until Vo
2
reaches its
set-point. Then Vo
1
continues to rise until both output
voltages have reached full voltage.
Vo
1
/Vo
2
Loading
The output voltages from the PT6980 series regulators are
independently regulated. The voltage at Vo
1
is produced
by a highly efficient switching regulator. The lower output
voltage, Vo
2
, is derived from Vo
1
. The regulation method
used for Vo
2
also provides control of this output voltage
during power-down. Vo
2
will sink current if the voltage at
Vo
1
attempts to fall below it.
The load specifications for each model of the PT6980
series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max)
load current for each output. For operation within the
product’s rating, the load currents at Vo
1
and Vo
2
must
comply with the following limits:-
Io
2
must be less than Io
2
(max).
The sum-total current from both outputs (Io
1
+ Io
2
)
must not exceed Io
1
(max).
In the case that either Vo
1
or Vo
2
are adjusted to some
other value than the default output voltage, the absolute
maximum load current for Io
2
must be revised to comply
with the following equation.
Io
2
(max)
=
2.5
Adc
Vo
1
– Vo
2
Consult the specification table for each model of the series
for the actual numeric values.
Figure 1; PT6980 Series Power-up
General Specifications
(Unless otherwise stated, T
a
=25°C, V
in
=12V)
PT6980 Series
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
Short Circuit Current
Switching Frequency
Standby (Pin 3)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
External Output Capacitance
I
sc
o
Io
1
+ Io
2
combined
Over V
in
range
Referenced to GND (pin 7)
—
500
19
550
—
600
A
kHz
V
IH
V
IL
I
IL
I
in
standby
C
2
C
3
T
a
—
–0.1
—
—
330
(2)
0
–40
(3)
—
—
-0.5
4
—
—
—
Open
(1)
+0.4
–
6
15,000
(2)
330
+85
(4)
V
mA
mA
pin 3 to GND
μF
Maximum Operating
Temperature Range
Storage Temperature
Mechanical Shock
Over V
in
Range
°C
T
s
—
Per Mil-STD-883D, Method 2002.3
1 msec, Sine, mounted
Per Mil-STD-883D, Method 2007.2
20-2000 Hz, Soldered in a PC board
Vertical/Horizontal
Meets UL 94V-O
–40
—
+125
°C
—
500
—
G ’s
Mechanical Vibration
—
—
15
26
—
—
G ’s
grams
Weight
Flammability
Notes:
(1) The Standby (pin 3) has an internal pull-up to Vin, and if it is left open circuit the module will operate when input power is applied.Refer to the application
notes for interface considerations.
(2) The total combined ESR of all output capacitance at 100kHz must be (less than) <50 m
.
(3) For operating temperatures below 0°C, Cin and Cout must have stable characteristics. Use either tantalum or Oscon capacitors.
(4) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating.
Input/Output C apacitors:
The PT6980 series requires a 330μF electrolytic capacitor at both the input and output for proper operation (300μF for Oscon or low ESR
tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance
may be required. Refer to the application notes for more information.
—
—
V1 (1V/Div)
V2 (1V/Div)
HORIZ SCALE: 5ms/Div
Vstby (10V/Div)
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