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參數(shù)資料
| 型號： | PT6656Q |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PSMA14 |
| 封裝： | PLASTIC, SIP-14 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 548K |
| 代理商： | PT6656Q |
Application Notes
For technical support and further information, visit http://power.ti.com
Using the Standby Function on the PT6650 Series
of 12/24-V Input Bus Converters
For applications requiring output voltage On/Off control,
the 14-pin PT6650 ISR series incorporates a standby
function. This feature may be used for power-up/shut-
down sequencing, and wherever there is a requirement
for the output status of the module to be controlled by
external circuitry.
The standby function is provided by the STBY* control,
pin 3. If pin 3 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to Vin (pins 4, 5, & 6) with respect
to GND (pins 7-10). Connecting pin 3 to ground 1 will
disable the regulator output and reduce the input current
to less than 30 mA 3. Grounding the standby control will
also hold-off the regulator output during the period that
input power is applied.
The standby input is ideally controlled with an open-drain
discrete transistor (See Figure 2-1). It can also be driven
directly from a dedicated TTL 2 compatible gate. Table 2-1
provides details of the threshold requirements.
Table 2-1 Inhibit Control Thresholds (1, 2)
Parameter
Min
Max
Enable (VIH)
1 V
5 V
Disable (VIL)
–0.1 V
0.3 V
Notes:
1. The Standby input on the PT6650 regulator series may be
controlled using either an open-collector (or open-drain)
discrete transistor, or a device with a totem-pole output. A
pull-up resistor is not necessary. The control input has an
open-circuit voltage of about 1.5 Vdc. To disable the
regulator output, the control pin must be “pulled” to less
than 0.3 Vdc with a low-level 0.25 mA maximum sink to
ground.
2. The Standby input on the PT6650 series is also compatible
with TTL logic. A standard TTL logic gate will meet the
0.3 V VIL(max) requirement (Table 2-1 ) at 0.25 mA sink
current. Do not drive the Standby control input above 5 Vdc.
3. When the regulator output is disabled the current drawn
from the input source is reduced to approximately 15 mA
(30 mA maximum).
4. The turn-off time of Q1, or rise time of the standby input
is not critical on the PT6650 series. Turning Q1 off over
periods up to 100 ms will not damage the regulator. However,
a slow turn-off time will increase both the initial delay and
rate-of-rise of the output voltage.
Figure 2-1
Turn-On Time:
Turning Q1 off in Figure 2-1, removes the
low-voltage signal at pin 3 and enables the output. The
PT6650 series of regulators will provide a fully regulated out-
put voltage within 12 ms. The actual turn-on time may
vary with load and the total amount of output capacitance.
Figure 2-2 shows the typical output voltage waveform of a
PT6653 (5 V) following the prompt turn-off of Q1 at time
t =0 secs. The waveform was measured with a 24 V input
voltage, and 5 A resistive load.
Figure 2-2
C
in
+
C
out
+
Inhibit
V
in
V
o
COM
Q1
BSS138
+5V V
in
PT6650
11,12,13
14
7,8,9,10
4,5,6
Vin
Vo
GND
Vo(adj)
STBY
3
Vsense
1
PT6650 Series
0
2468
10
12
t (milli - secs)
Vo (2V/Div)
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| PT6656R | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 12Vout 4A 24V-Input Adjustable ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT6670 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V INPUT 20W BOOST INTEGRATED SWITCHING REGULATOR |
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| PT6671D | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 5Vout 3.3V-Input 20W Boost ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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