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參數資料
| 型號： | PT7675A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 30 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, MSMA18 |
| 封裝： | SIP-27 |
| 文件頁數： | 9/10頁 |
| 文件大小： | 204K |
| 代理商： | PT7675A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT7670 Series
Pin-Coded Output Voltage Adjustment of the
PT7670 Series of 30-A Switching Regulators
The PT7670 Excalibur family of converters use a pin
code to adjust the output voltage. This feature uses the
control inputs, VID0–VID4 (pins 1–6). When these pins
are left open-circuit, the ISR regulates at its default output
voltage. Each of the programming pins are internally
connected to a precision resistor, and when pulled low 1
applies a weighted change to the output voltage. By
selectively connecting VID0–VID4 to Sense(–) 2, the
output voltage of these ISRs can be programmed in
incremental steps over their specified output voltage
range. The program codes and output voltages offered
by these ISRs are compatible with the Voltage ID
specifications used by popular microprocessors. See
Figure 4-1 for the connection schematic, and the
respective device data sheet for the programming code
information.
Notes:
1. The programming convention is as follows:-
Logic 0:Connect to pin 12; Sense(–).
Logic 1:Open circuit/open drain (See Note 2)
2. For optimal output voltage accuracy Sense(–) (pin 12)
should always be used as the logic ‘0’ reference. The
input/output ground (pins 13-19) can also be used if
pin 12 is connected to pin 13 external to the module.
3. Do not connect pull-up resistors to the voltage
programming pins.
Figure 4-1
4. If active devices are used to ground the voltage control
pins, low-level open drain MOSFET devices should be
used over bipolar transistors. The inherent Vce(sat) in
bipolar devices introduces errors in the device’s internal
divider network. Discrete transistors such as the BSS138,
2N7002, or IRLML2402 are examples of appropriate
devices.
Active Voltage Programming:
Special precautions should be taken when making changes
to the output voltage progam code while the unit is
powered. This activity can induce current transients
through the device as a result of the electrolytic output
capacitors being either charged or discharged to the new
output voltage set-point. The transient current can be
minimized by making only incremental changes to the
binary code, i.e. one LSB at a time. A minimum of 100s
settling time between each program state is also recom-
mended. Making non-incremental changes to VID3 or
VID4 is discouraged.
When active devices are used to program the output
voltage, their state should be asserted prior to the input
power being applied. One approach is to pull STBY (pin 5)
control to GND prior to power up. After the host board
has then asserted the program code, the ground signal
to pin 5 can be removed. This will allow the regulator to
intiate a clean soft-start power-up to the desired program
voltage. For more information on the use of the Standby
function, consult the related application note, “Using
the Standby Function on the PT7670 Series of 30-A
Switching Regulators.”
C
out
+
C
in
+
1 H
(Optional)
V
IN
COM
STBY
L
O
A
D
Q
1
L
1
Sense(–)
V
OUT
Power GND
PT7671
43
1
26
20–25
12
513–19
7–11
V
OUT
V
IN
GND
SNS(+)
SNS(–)
STBY
VID4 - VID0
2
6
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| PT7675C | 功能描述:開關變換器、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 |
| PT7675N | 功能描述:REG 1.075-1.85V 30A 5VIN VERT RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7670 設計資源:VI-200, VI-J00 Design Guide, Appl Manual 標準包裝:1 系列:* 類型:隔離 輸出數:1 電壓 - 輸入（最?。?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:* 安裝類型: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 類別:電源 - 板載 >> DC DC Converters 系列:PT7680 設計資源:Maxi/Mini/Micro Design Guide, Appl Manual 標準包裝:1 系列:Maxi 類型:隔離 輸出數: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:* |
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