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| 型号： | PT6719A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA17 |
| 封装： | HORIZONTAL MOUNT PACKAGE-17 |
| 文件页数： | 4/9页 |
| 文件大小： | 230K |
| 代理商： | PT6719A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the On/Off Standby Function on the
PT6705/6715 Excalibur Series of ISRs
The PT6705 and PT6715 regulator series are non-
programmable (preset voltage) versions of the PT6701,
PT6702, and PT6703 products.
The PT6705/6715 series of products incorporate an on/
off ‘standby’ function, which may be used disable the
regulator output. The standby function is provided by
the STBY* control, pin 2. If pin 2 is left open-circuit the
regulator operates normally, and provides a regulated
output when a valid supply voltage is applied to Vin
(pins 4–6) with respect to GND (pins 8–12). If pin 2 is
connected to ground, the regulator output is disabled
and the input current drawn by the ISR typically drops
to its idle value 1. The standby control may also be used
to hold-off the regulator output during the period that
input power is applied.
Pin 2 is ideally controlled with an open-collector (or
open-drain) discrete transistor (See Figure 1-1 2). The
open-circuit voltage will be approximately 12.0V. Table 1-1
gives the circuit parameters for this control input.
Table 1-1 Standby Control Requirements (3, 4)
Parameter
Min
Typ
Max
Enable (VIH)
—
Open Circuit
Disable (VIL)
–0.2V
0.4V
Istby (pin 2 =ground)
–0.5mA
Vstby (open circuit)
12.0V
15.0V
Figure 1-1
Turn-On Time:
In the circuit of Figure 1-1, turning Q1 on
applies a low voltage to pin 2 and disables the regulator
output. Correspondingly, turning Q1 off removes the low-
voltage signal and enables the output 5. Once enabled, the
output will typically experience a 10–15ms delay followed
by a predictable ramp-up of voltage. The regulator pro-
vides a fully regulated output within 40ms. The waveforms
of Figure 1-2 show the rise of both the output voltage
and input current for a PT6706 (2.5V). The turn off of
Q1 corresponds to the rise of Vstby. The waveform was
measured with a 5-Vdc input voltage and an 8-ADC load.
Figure 1-2
PT6705 & PT6715 Series
PT6705
Sns(+)
Sns(-)
V
OUT
G N D
Vo(adj)
V
IN
Stby*
V
Bias
13–16
17
7
1
8–12
4,5,6
23
C
OUT
+
C
IN
+
STBY
+V
in
GND
V
out
Q1
BSS138
+12V
(PT6705 Series Only)
Notes:
1. When the regulator output is disabled the current drawn
from the +Vin input source is typically reduced to 25mA
for the PT671x series, and to less than 100A for the
PT670x series.
2. Figure 1-1 is an application schematic for the PT670x
models. This shows the requirement for an external +12V
bias supply. The +12V bias is not required for the PT671x
models. For more details, consult the applicable product
data sheet.
3. The standby control input requires no external pull-up
resistor. The open-circuit voltage of the STBY* pin is
approximately 12.0V.
4. The standby control input is Not compatible with TTL
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.
5 After Q1 in Figure 1-1 is turned off and before the
output begins to rise, the regulator output will assert a low
impedance to ground. If an external voltage is applied to
the output it will sink current and possibly over-stress the
part.
/DIV
Vo (1V / DIV)
Iin (2A / DIV)
Vstby (10V / DIV)
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