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參數(shù)資料
| 型號： | PT6346C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA12 |
| 封裝： | SIP-12 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 199K |
| 代理商： | PT6346C |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the Inhibit Function on the PT6340
12V Bus Excalibur Series Converters
The PT6340 series are high efficiency regulators that
are designed to operate off a 12V input bus. These devices
incorporate an inhibit function, which may be used in
applications that require a power-up/shutdown feature.
The inhibit function is provided by the Inhibit* control,
pin 1. If pin 1 is left open-circuit the regulator operates
normally, and provides a regulated output whenever a valid
supply voltage is applied to Vin (pins 2– 4) with respect
to GND (pins 5–8). If a low voltage 2 is then applied to
pin 1 the regulator output will be disabled and the input
current drawn by the ISR will typically drop to 0.5mA 4.
The standby control may also be used to hold-off the
regulator output during the period that input power is
applied.
The Inhibit* input can be controlled with an open-collector
(or open-drain) discrete transistor (See Figure 1). The
input is internally pulled-up to the input voltage, Vin 1.
Table 1 gives the control voltage requirements.
Table 1 Inhibit Control Requirements 3
Parameter
Min
Typ
Max
VIL
-0.1V
0.6V
VIH
2.0V
Vin
IIL
0.5mA
Notes:
1. The inhibit control input requires no external pull-up
resistor. The open-circuit voltage of the Inhibit* input is
typically the input voltage, Vin.
2. The inhibit control input is Not compatible with TTL
devices. An open-collector device, preferably a discrete
bipolar transistor (or MOSFET) is recommended. To
ensure the regulator output is disabled, the control pin
must be pulled to less than 0.6Vdc with a low-level
0.5mA sink to ground.
3. An external source voltage can be used to control the
Inhibit* pin. To guarantee the inhibit and enable status
of the regulator, the source must be capable of meeting
the voltage requirements in Table 1 .
4. When the regulator output is disabled the current drawn
from the input source is typically reduced to 0.5mA.
Figure 1
Turn-On Time:
In the circuit of Figure 1, turning Q1 on
applies a low voltage to the Inhibit* control (pin 1) and
disables the regulator ouput. Correspondingly, turning
Q1 off removes the low-voltage signal and enables the
output. Once enabled, the output will typically experience
a 10–15ms delay followed by a predictable ramp-up of
voltage. The regulator should provide a fully regulated
output voltage within 30ms. The waveform of Figure 2
shows the output voltage response of a PT6342 (3.3V)
following the turn-off of Q1. The turn off of Q1 corre-
sponds to the rise in Vinh. The waveforms were measured
with a 12Vdc input voltage, and 2 Adc load.
Figure 2
C
in
+
C
out
+
Inhibit
+12V
+3.3V
COM
Q1
BSS138
PT6342
2,3,4
5–8
1 2
9,10,11
Vin
V o
V o(adj)
GND
1
Inhibit*
PT6340 Series
Vo (2V/Div)
Iin (0.5A/Div)
Vinh (10V/Div)
HORIZ SCALE: 5ms/Div
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