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參數(shù)資料
| 型號(hào)： | PT7675A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 30 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, MSMA18 |
| 封裝： | SIP-27 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | PT7675A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7670 Series
Using the Standby Function on the PT7670
Series of 30-A Switching Regulators
For applications requiring On/Off control of the output
voltage, the 30-A rated PT7670 series of Excalibur ISRs
incorporate an on/off “Standby” function. This feature
may be used for power-up/shutdown sequencing, or to
change the output voltage while input power is applied.
See related notes: “Pin-Coded Output Voltage Adjustment
of the PT7670 Series of 30-A ISRs.”
The standby function is provided by the STBY* control,
pin 5. If pin 5 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to Vin (pins 7-11) with respect to
GND (pins 13-19). Connecting pin 5 to ground 1 will
disable the regulator output 2. This places the regulator
in standby mode, and reduces the input current to typically
6mA. If a ground signal is applied to pin 5 prior to power-
up, the regulator output will remain inactive during the
period that input power is applied.
The standby input must be controlled with an open-
collector (or open-drain) discrete transistor (See Figure
3-1). Table 3-1 gives the input requirements.
Table 3-1 Standby Control Input Requirements
Parameter
Min
Typ
Max
Enable
2 V
Open Cct. 1
Disable
–0.2 V
0.8 V
Istby (low)
0.5 mA
Vstby (o/c)
Vin
Notes:
1. The Standby input of the PT7670 series of regulators
should be controlled using an open-collector (or open-
drain) discrete transistor. Do Not use a pull-up resistor. The
control input has an open-circuit voltage equal to Vin. To
set the regulator output to zero, the control pin must be
“pulled” to less than 0.8Vdc with a 0.5mA sink to ground.
Figure 3-1
Turn-On Time:
Turning Q1 in Fig. 3-1 off, removes the
low-voltage signal at pin 5 and enables the output 3. Af-
ter a delay of less than 5 ms, the output voltage rises to
full regulation within 30 ms 4. Fig. 3-2 shows the typical
output voltage waveform of a PT7671 following the
turn-off of Q1 at time t =0 secs. In the circuit of Fig. 3-1,
the output voltage is set to 3.3 V. The waveform was
measured with a +5-V input source voltage, and 15-A
output load.
Figure 3-2
C
out
+
C
in
+
5 V
COM
Inhibit
L
O
A
D
PT7671
43
1
26
20–25
12
513–19
7–11
Vo
Vin
GND
Senes(+)
STBY
VID3 - VID0
Senes(–)
V
o =3.3 V
COM
Q
1
BSS138
2
Iin (5A/Div)
Vo (2V/Div)
Vstby (5V/Div)
HORIZ SCALE: 5ms/Div
2. In the standby mode the output of the regulator is tri-
state, and the output voltage falls at the rate that the
load circuit discharges the output filter capacitors.
3. When the ground signal to the Standby pin is removed,
the regulator output initiates a soft-start cycle by first
asserting a low impedance to ground. If an external
voltage is applied to the output bus, it will sink current and
possibly over-stress the part.
4. The turn-off time of Q1, or rise time of the standby input
is not critical. Turning Q1 off slowly will not affect regulator
operation. However, a slow turn-off time will increase
both the initial delay and rise-time of the output voltage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| PT7675C | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 PROGRAMMABLE 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(kāi)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 |
| PT7675N | 功能描述:REG 1.075-1.85V 30A 5VIN VERT RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT7670 設(shè)計(jì)資源:VI-200, VI-J00 Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:* 類(lèi)型:隔離 輸出數(shù):1 電壓 - 輸入（最小）:55V 電壓 - 輸入（最大）:100V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:200W 電壓 - 隔離:* 特點(diǎn):* 安裝類(lèi)型:通孔 封裝/外殼:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包裝:散裝 工作溫度:-55°C ~ 85°C 效率:* 電源（瓦特）- 最大:* |
| PT768 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:三相整流橋 |
| PT7681 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2V to 3.5V 30A. 5-V Input Programmable ISR w/ Margin Control |
| PT7681A | 功能描述:REG 2-3.5V 30A 5VIN PROG HORZ RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT7680 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類(lèi)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(diǎn):* 安裝類(lèi)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:* |
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