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參數(shù)資料
| 型號： | PT7705C |
| 英文描述： | Dimming Ballast Control, Brown-out Protection, Programmable Preheat Time, 1.8us Deadtime in a 16-pin DIP package; Similar to IR21593 with Lead Free Packaging |
| 中文描述： | 開關(guān)電源控制器 |
| 文件頁數(shù)： | 3/5頁 |
| 文件大小： | 202K |
| 代理商： | PT7705C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT7705/7706 Series
Pin-Coded Output Voltage Adjustment on the
“Big Hammer” Series ISRs
The ISRs related to Power Trends’ PT7705 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 output 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 these ISRs can be pro-
grammed in incremental steps over the specified output
voltage range. In each case, the program code and output
voltage range offered by these ISRs are compatible with
the voltage ID specification defined by Intel Corporation
for voltage regulator modules (VRMs) used to power
Pentium microprocessors. Refer to Figure 1 below for
the connection schematic, and the respective device 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
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.
Figure 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 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 held in standby. Changes
made to the program code while V
is enabled induces
high current 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 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. Mak-
ing 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
. 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)
+5V
COM
STBY
L
O
A
D
PT7705
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT7705N | Advanced PFC and Ballast Control IC in a 16-Lead SOIC Package; A IRS2168DSPBF with Standard Packaging |
| PT7706A | Dimming Ballast Control, Brown-out Protection, Programmable Preheat Time, 1.8us Deadtime in a 16-lead SOIC Narrow package; Similar to IR21592S with Lead Free Packaging |
| PT7706C | Dimming Ballast Control, Brown-out Protection, Programmable Preheat Time, 1.8us Deadtime in a 16-lead SOIC Narrow package; Similar to IR21592STR with Lead Free Packaging. |
| PT7706N | Self-Oscillating Half Bridge Driver, 1.1us Deadtime in a 8-pin DIP package; Similar to IRS2153DPBF with standard packaging and deadtime rating of 0.6 microseconds |
| PT7707A | Analog IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7705N | 功能描述:DC/DC轉(zhuǎn)換器 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）: 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: |
| PT7705N1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.3 to 3.5Vout 18Amp 5Vin Prgrmable 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 |
| PT7706 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGULATOR |
| PT7706A | 功能描述:REGU 15A 1.3-2.05V 4BIT 3.3V IN RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7700 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類型: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 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
| PT7706C | 功能描述:REGU 15A 1.3-2.05V 4BIT SMD RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7700 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類型: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 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
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