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| 型号： | PT7705A |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PSIP27 |
| 封装： | HORIZONTAL THROUGH HOLE, SIP-27 |
| 文件页数： | 3/4页 |
| 文件大小： | 205K |
| 代理商： | PT7705A |
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
PT7705/7707 Series
More Application Notes
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) respec-
tively. 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 selec-
tively grounding VID0 -VID4, the output voltage these ISRs
can be programmed 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 micropro-
cessors. Refer to Figure 1 below for the connection schematic,
and the respective device Data Sheet for the appropriate pro-
gramming 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-
ming, 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 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)
+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
相关PDF资料 |
PDF描述 |
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| PT7706C | 18 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7706N | 18 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7707A | 18 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7707C | 18 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7707N | 18 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT7705C | 功能描述:开关变换器、稳压器与控制器 PROGRAMMABLE ISR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| PT7705N | 功能描述:DC/DC转换器 PROGRAMMABLE ISR RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PT7705N1 | 功能描述:开关变换器、稳压器与控制器 1.3 to 3.5Vout 18Amp 5Vin Prgrmable ISR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| PT7706 | 制造商:TI 制造商全称: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 类别:电源 - 板载 >> DC DC Converters 系列:PT7700 标准包装:10 系列:PT4570 类型:隔离 输出数:1 电压 - 输入（最小）:36V 电压 - 输入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:3.3A 电源（瓦） - 制造商系列:30W 电压 - 隔离:1.5kV（1500V） 特点:- 安装类型:表面贴装 封装/外壳:19-SIP SMD 模块 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包装:托盘 工作温度:-40°C ~ 85°C 效率:84% 电源（瓦特）- 最大:30W |
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