參數(shù)資料
型號: PT6715N
英文描述: 20V Single N-Channel HEXFET Power MOSFET in a TO-262 package; A IRL3714L with Standard Packaging
中文描述: 開關(guān)電源控制器
文件頁數(shù): 4/8頁
文件大?。?/td> 205K
代理商: PT6715N
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 V
in
(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
Enable (V
IH
)
Disable (V
IL
)
I
stby
(pin 2 =ground)
V
stby
(open circuit)
Min
–0.2V
Typ
Max
Open Circuit
0.4V
–0.5mA
12.0V
15.0V
Figure 1-1
Turn-On Time:
In the circuit of Figure 1-1, turning Q
1
on
applies a low voltage to pin 2 and disables the regulator
output. Correspondingly, turning Q
1
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
Q
1
corresponds to the rise of V
stby
. The waveform was
measured with a 5-Vdc input voltage and an 8-ADC load.
Figure 1-2
PT6705 & PT6715 Series
PT6705
Sns(+)
Sns(-)
7
V
OUT
GND
Vo(adj)
V
IN
Stby*
V
Bias
13–16
17
1
8–12
4,5,6
2
3
C
OUT
+
C
IN
+
STBY
+V
in
GND
GND
V
out
Q1
BSS138
+12V
(PT6705 Series Only)
Notes:
1. When the regulator output is disabled the current drawn
from the +V
in
input source is typically reduced to 25mA
for the PT671x series, and to less than 100μA 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 Q
1
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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