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參數(shù)資料
| 型號： | PT7721C |
| 英文描述： | Single High Side Driver, Noninverting Input. IN Voltage Threshold 9.5V & 6.0V; A IRS2117 packaged in a Lead-Free 8-Lead SOIC shipped on Tape and Reel |
| 中文描述： | 開關電源控制器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 142K |
| 代理商： | PT7721C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7720 Series
Pin-Coded Output Voltage Adjustment on the
“
Big Hammer II
”
Series ISRs
Power Trends PT7720 series ISRs incorporate pin-coded
voltage 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 will regulate at its factory trimmed output voltage.
Each pin is internally 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 speci-
fied output voltage range. The output voltage ranges
offered by these regulators provide a convenient method
of voltage selection for many applications. In addition,
the program code and output voltage range of the PT7721
model is compatible with the voltage ID specification
defined by Intel Corporation for voltage regulator modules
(VRMs) used to power Pentium II microprocessors.
Refer to Figure 2-1 below for the connection schematic,
and the PT7720 Data Sheet for the appropriate pro-
gramming code information.
Notes:
1. The programming convention is as follows:-
Logic 0:
Logic 1:
2. Do not connect pull-up resistors to the voltage
programming pins.
3. To minimize output voltage error, always use pin 12 (Sense
Ground) as the logic “0” reference. While the regular
Connect to pin12 (Remote Sense Ground).
Open circuit/open drain (See notes 2, & 4)
Figure 2-1
ground (pins 13-19) can also be used for programming,
doing so will degrade the load reglation of the product.
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 V
ce
(sat) in
bipolar devices introduces errors in the device’s internal
divider network. Discrete transistors such as the BSS138,
2N7002, or the IRLML2402 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 V
out
is enabled induces high current
transients through the device. This is the result of the
electrolytic output capacitors being either charged or dis-
charged 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 100μs 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 resulting 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 V
in
. Releasing pin 5 will then
allow the device output to execute a soft-start power-up
to the programmed voltage.
Cout
+
Cin
+
1
μ
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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PT7721N | 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 |
| PT7722 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:17 AMP 12V INPUT “BIG-HAMMER II” PROGRAMMABLE ISR |
| PT7722A | 功能描述:開關變換器、穩(wěn)壓器與控制器 4.5-7.6Vout 17Amp 12 Vin 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 |
| PT7722C | 制造商:POWERTRENDS 功能描述: |
| PT7722N | 功能描述:DC/DC轉換器 4.5-7.6Vout 17Amp 12 Vin Programmable ISR RoHS:否 制造商:Murata 產品: 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: |
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