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參數(shù)資料
| 型號(hào)： | PT7756A |
| 英文描述： | Intelligent Power Switch 1 Channel High Side Driver in a SO-8 Package |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 128K |
| 代理商： | PT7756A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT7750 Series
Pin-Coded Output Voltage Adjustment on the
“Big Hammer III” Series ISRs
Power Trends PT7750 series ISRs incorporating pin-
coded voltage control, use pins 1, 2, 3, 4, & 6 to adjust
the ouput voltage. The control pins are identified
VID0 - VID4 respectively. When the control pins are
left open-circuit, the ISR output will regulate at its fac-
tory trimmed output voltage. Each control pin is
internally connected to a precision resistor, and when
grounded increases the output voltage by a set amount.
The internal resistors are binary code weighted, allowing
the output voltage of the ISR to be programmed as a
function of a binary code. VID0 represents the LSB, and
VID4 the MSB (or range change bit). The output volt-
age ranges offered by these regulators are compatible
with some microprocessors, and provide a convenient
method of output voltage selection for many other appli-
cations. Refer to Figure 1 below for the connection
schematic, and the PT7750 Data Sheet for the program-
ming 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
programming pins.
3. To minimize output voltage error, always use pin 12
(Remote Sense Ground) as the logic “0” reference. While
the regular 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
Figure 1
pins, low-level open drain MOSFET devices should be
used over bipolar transistors. The inherent V
(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 in standby. Changes made to
the program code while V
is enabled induces high cur-
rent transients through the device. This is the 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 incre-
mental 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 pro-
gram 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
. Releasing pin 5 will then
allow the device output to execute a soft-start power-up
to the programmed voltage. For more information on
the use of the Standby function, consult the related appli-
cation note, “Using the Standby Function on the ‘Big
Hammer III’ Programmable ISR Series.”
Cout
+
Cin
+
1
μ
H
(Optional)
+24V
COM
STBY
L
O
A
D
PT7750
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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| PT7756C | Intelligent Power Switch 1 Channel High Side Driver in a D2-Pak 5-Lead Package |
| PT7756N | Intelligent Power Switch 1 Channel High Side Driver in a SO-8 Package |
| PT7761 | Intelligent Power Switch 1 Channel High Side Driver in a SO-8 Package |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7756C | 功能描述:DC/DC轉(zhuǎn)換器 6.6-12.8Vout 15A 24V Input Prog 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）: 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: |
| PT7756N | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 6.6-12.8Vout 15A 24V Input Prog 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(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 |
| PT7761 | 制造商:DATATRONIC 功能描述: |
| PT7761-5V | 制造商:TI 制造商全稱:Texas Instruments 功能描述:40-A Programmable Integrated Switching Regulator Module |
| PT7761A | 功能描述:DC/DC轉(zhuǎn)換器 1.3V to 3.5V 40-A 5V Input Prog 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）: 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: |
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