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參數(shù)資料
| 型號： | PT6985 |
| 英文描述： | 2.5V/1.2V. 9A 12V-Input Dual Output ISR |
| 中文描述： | 2.5V/1.2V。第9A 12V的輸入雙輸出ISR的 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 271K |
| 代理商： | PT6985 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6980 Series
Using the Standby Function on the PT6980
Series of Dual-Output Voltage Regulators
Both output voltages of the 23-pin PT6980 dual-output
converter may be disabled using the regulator’s ‘Standby’
function. This function may be used in applications that
require power-up/shutdown sequencing, or wherever there
is a requirement to control the output voltage On/Off status
with external circuitry.
The standby function is provided by the
STBY*
control
(pin 3). If pin 3 is left open-circuit the regulator operates
normally, and provides a regulated output at both Vo
1
(pins
12–15) and Vo
2
(pins 18–21) whenever a valid supply volt-
age is applied to V
in
(pins 4, 5, & 6) with respect to GND
(pins 7-11). If a low voltage
1
is then applied to pin-3 both
regulator outputs will be simultaneously disabled and the
input current drawn by the ISR will drop to a typical value
of 4mA. The standby control may also be used to hold-off
both regulator outputs during the period that input power is
applied.
The standby pin is ideally controlled using an open-collector
(or open-drain) discrete transistor (See Figure 1). The
open-circuit voltage is the input voltage +V
in
. Table 1 gives
the circuit parameters for this control input.
Table 1 Standby Control Parameters
1, 2
Parameter
Enable (V
IH
)
Disable (V
IL
)
V
STBY
(open circuit)
I
STBY
(I
IL
)
Min
—
–0.1V
—
—
TYP
—
—
+V
in
2
—
Max
Open circuit
0.4V
1
—
–0.5mA
Notes:
1. The standby control input is
Not
compatible with TTL or
other devices that incorporate a totem-pole output drive. Use
only a true open-collector device, preferably a discrete bipolar
transistor (or MOSFET). To ensure the regulator output is
disabled, the control pin must be pulled to less than 0.4Vdc
with a low-level 0.5mA sink to ground.
2 The standby control input requires no external pull-up resistor.
The open-circuit voltage of the STBY* pin is the input
voltage +V
in
.
3. When the regulator output is disabled the current drawn from
the input source is typically reduced to 4mA.
Figure 1
Turn-On Time:
Turning Q
1
in Figure 1 off removes the low-
voltage signal at pin 3 and enables the PT6980 series
regulator. Following a delay of about 25ms, Vo
1
and Vo
2
rise together until the lower voltage, Vo
2
, reaches its set
output. Vo
1
continues to rise until both outputs reach full
regulation voltage. The total power-up time is less than
40ms, and is relatively independent of load, temperature,
and output capacitance. Figure 2 shows waveforms of the
output voltages, Vo
1
and Vo
2
, for a PT6984 (3.3V/1.2V).
The turn-off of Q
1
corresponds to the rise in V
STBY
. The
waveforms were measured with a 12V input voltage, and
with resistive loads of 5A and 1.25A at the Vo
1
and Vo
2
outputs respectively.
Figure 2
C
1
+
C
2
+
Inhibit
V
in
Vo
2
COM
COM
Q1
BSS138
Vo
1
C
3
+
4, 5, 6
PT6984
18–21
23
7–11
V
IN
Vo
2
GND
V
2
(adj)
V
1
(sns)
1
16
V
1
(adj)
12–15
Vo
1
V
2
(sns)
22
STBY
3
V1 (1V/Div)
V2 (1V/Div)
HORIZ SCALE: 5ms/Div
Vstby (10V/Div)
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