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參數(shù)資料
| 型號： | PT6981A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 10.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, SMA23 |
| 封裝： | HORIZONTAL THROUGH HOLE-23 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大小： | 295K |
| 代理商： | PT6981A |
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 Vo1 (pins
12–15) and Vo2 (pins 18–21) whenever a valid supply volt-
age is applied to Vin (pins 4, 5, & 6) with respect to GND
(pins 7-11). If a low voltage1 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 +Vin. Table 1 gives
the circuit parameters for this control input.
Table 1 Standby Control Parameters 1, 2
Parameter
Min
TYP
Max
Enable (VIH)
—
Open circuit
Disable (VIL)
–0.1V
—
0.4V 1
VSTBY (open circuit)
—
+Vin 2
—
ISTBY (IIL)
—
–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 +Vin.
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 Q1 in Figure 1 off removes the low-
voltage signal at pin 3 and enables the PT6980 series
regulator. Following a delay of about 25ms, Vo1 and Vo2
rise together until the lower voltage, Vo2, reaches its set
output. Vo1 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, Vo1 and Vo2, for a PT6984 (3.3V/1.2V).
The turn-off of Q1 corresponds to the rise in VSTBY. The
waveforms were measured with a 12V input voltage, and
with resistive loads of 5A and 1.25A at the Vo1 and Vo2
outputs respectively.
Figure 2
C
1
+
C
2
+
Inhibit
V
in
Vo
2
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT6981C | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2.5/1.8V 10.5A 12V In Dual Output 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT6981N | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-A 12V-Input Dual Output Integrated Switching Regulator |
| PT6982 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3.3V/2.5V. 10.5A 12V-Input Dual Output ISR |
| PT6982A | 功能描述:REGULATOR 3.3/2.5V 12VIN HORZ RoHS:是 類別:電源 - 板載 >> DC DC Converters 系列:PT6980 設(shè)計資源:Maxi/Mini/Micro Design Guide, Appl Manual 標準包裝:1 系列:Maxi 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點:* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT6982C | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3/2.5V 10.5A 12V In Dual Output 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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