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參數(shù)資料
| 型號(hào)： | PT7722A |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, SMA27 |
| 封裝： | HORIZONTAL THROUGH HOLE, SIP-27 |
| 文件頁(yè)數(shù)： | 3/3頁(yè) |
| 文件大小： | 203K |
| 代理商： | PT7722A |
For assistance or to order, call (800) 531-5782
3
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Applicatio n
Note s
PT7720 Series
Pin-Coded Output Voltage Adjustment on the
“Big Hammer II” Series ISRs
Power Trends PT7720 series ISRs incorporate pin-coded volt-
age control to adjust the ouput voltage. The control pins are
identified VID0 - VID4 (pins 1, 2, 3, 4, & 6) respectively.
When the control pins are left open-circuit, the ISR output will
regulate at its factory trimmed output voltage. Each pin is inter-
nally connected to a precision resistor, which when grounded
changes the output voltage by a set amount. By selectively
grounding VID0 -VID4, the output voltage of each ISR in the
PT7720 series ISRs can be programmed in incremental steps
over its specified output voltage range. The output voltage
ranges offered by these regulators provide a convenient method
of output voltage selection for many applications. In addition,
the program code and output voltage range of the PT7721
model ISR is compatible with the voltage ID specification de-
fined by Intel Corporation for voltage regulator modules
(VRMs) used to power Pentium microprocessors. Refer to
Figure 1 below for the connection schematic, and the PT7720
Data Sheet for the appropriate programming code information.
Notes:
1. The programming convention is as follows:-
Logic 0:
Connect to pin12 (Remote Sense Ground).
Logic 1:
Open circuit/open drain (See notes 2, & 4)
2. Do not connect pull-up resistors to the voltage program-
ming pins.
3. To minimize output voltage error, always use pin 12 (Re-
mote Sense Ground) as the logic “0” reference. While the
regular ground (pins 13-19) can also be used for program-
Figure 1
ming, doing so will degrade the load reglation of the prod-
uct.
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,
IRLML2402, or the 74C906 hex open-drain buffer are
examples of appropriate devices.
Active Voltage Programming:
Special precautions should be taken when making changes to the
voltage control progam code while the unit is powered. It is
highly recommended that the ISR be either powered down or
held in standby. Changes made to the program code while Vout
is enabled induces high current transients through the device.
This is the result of the electrolytic output capacitors being ei-
ther charged or discharged to the new output voltage set-point.
The transient current can be minimized by making only incre-
mental changes to the binary code, i.e. one LSB at a time. A
minimum of 100s settling time between each program state is
also recommended. Making non-incremental changes to VID3
and VID4 with the output enabled is discouraged. If they are
changed, the transients induced can overstress the device result-
ing in a permanent drop in efficiency. If the use of active devices
prevents the program code being asserted prior to power-up,
pull pin 5 (STBY) to the device GND during the period that the
input voltage is applied to Vin. Releasing pin 5 will then allow
the device output to execute a soft-start power-up to the pro-
grammed voltage.
Cout
+
Cin
+
1
H
(Optional)
+12V
COM
STBY
L
O
A
D
PT7720
6
4
3
2
1
26
20-25
12
5
13-19
27
7-11
Vo
Vin
GND
SNS(+)
SNS(-)
Synch
Out
STBY
VID4 - VID0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7722C | 制造商:POWERTRENDS 功能描述: |
| PT7722N | 功能描述:DC/DC轉(zhuǎn)換器 4.5-7.6Vout 17Amp 12 Vin Programmable ISR 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(biāo)稱(chēng)）: 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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PT7740 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:32Amp ＇Current Booster＇ for the PT7778 Regulator |
| PT7740A | 功能描述:REGULATR 32A BSTR FOR PT7778 HRZ RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT7740 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類(lèi)型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?36V 電壓 - 輸入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:3.3A 電源（瓦） - 制造商系列:30W 電壓 - 隔離:1.5kV（1500V） 特點(diǎn):- 安裝類(lèi)型:表面貼裝 封裝/外殼:19-SIP SMD 模塊 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包裝:托盤(pán) 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
| PT7740C | 功能描述:REGULATR 32A BSTR FOR PT7778 SMD RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT7740 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類(lèi)型:隔離 輸出數(shù):1 電壓 - 輸入（最小）:36V 電壓 - 輸入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:3.3A 電源（瓦） - 制造商系列:30W 電壓 - 隔離:1.5kV（1500V） 特點(diǎn):- 安裝類(lèi)型:表面貼裝 封裝/外殼:19-SIP SMD 模塊 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包裝:托盤(pán) 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
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