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參數(shù)資料
| 型號： | PT6938N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8.6 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| 封裝： | VERTICAL MOUNT PACKAGE-23 |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 267K |
| 代理商： | PT6938N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6935 Series
Using the Standby Function on the PT6935
Series of Dual-Output Voltage Regulators
Both output voltages of the 23-pin PT6935 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 7mA. 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 typically 12.6V. Table 1 gives the
circuit parameters for this control input.
Table 1 Standby Control Parameters 1, 2
Parameter
Min
Max
Enable (VIH)
—
Open circuit
Disable (VIL)
–0.1V
0.4V 1
VSTBY (open circuit)
12.6V 2
15V
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.
2The standby control input requires no external pull-up resistor.
The open-circuit voltage of the STBY* pin is typically 12.6V.
3. When the regulator output is disabled the current drawn from
the input source is typically reduced to 7mA.
Figure 1
Turn-On Time:
Turning Q1 in Figure 1 off removes the low-
voltage signal at pin 3 and enables the PT6935 regulator.
Following a delay of about 15ms, 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 30ms, and is
relatively independent of load, temperature, and output
capacitance. Figure 2 shows waveforms of the output voltages,
Vo1 and Vo2, for a PT6937 (3.3V/1.8V). The turn-off of
Q1 corresponds to the rise in VSTBY. The waveforms were
measured with a 5V input voltage, and with resistive loads
of 4.5A and 1.9A at the Vo1 and Vo2 outputs respectively.
Figure 2
V1 (1V/Div)
V2 (1V/Div)
Vstby
(10V/Div)
HORIZ SCALE: 5ms/Div
C
1
+
C
2
+
Inhibit
V
in
Vo
2
COM
Q1
BSS138
PT6935
18 - 21
23
7 - 11
4, 5, 6
V
IN
Vo
2
GND
Vo
2 (adj)
Vo
1 (sns)
1
16
Vo
1 (adj)
12 - 15
Vo
1
Vo
2(sns)
22
STBY
3
Vo
1
C
3
+
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PT6939 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:11-A 5V/3.3V-Input Dual Output Integrated Switching Regulator |
| PT6939A | 功能描述:DC/DC轉(zhuǎn)換器 11A 5V/3.3V-Inp Dual Output Int Swtch Reg RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PT6939C | 功能描述:開關變換器、穩(wěn)壓器與控制器 11A 5V/3.3V-Inp Dual Output Int Swtch Reg 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 |
| PT6939N | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Analog IC |
| PT6940 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator |
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