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参数资料
| 型号： | PT7673N |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 30 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, MSMA27 |
| 封装： | SIP-27 |
| 文件页数： | 8/9页 |
| 文件大小： | 182K |
| 代理商： | PT7673N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT7670 Series
Pin-Coded Output Voltage Adjustment of the
PT7670 Series of 30-A Switching Regulators
The PT7670 Excalibur family of converters use a pin
code to adjust the output voltage. This feature uses the
control inputs, VID0–VID4 (pins 1–6). When these pins
are left open-circuit, the ISR regulates at its default output
voltage. Each of the programming pins are internally
connected to a precision resistor, and when pulled low 1
applies a weighted change to the output voltage. By
selectively connecting VID0–VID4 to Sense(–) 2, the
output voltage of these ISRs can be programmed in
incremental steps over their specified output voltage
range. The program codes and output voltages offered
by these ISRs are compatible with the Voltage ID
specifications used by popular microprocessors. See
Figure 4-1 for the connection schematic, and the
respective device data sheet for the programming code
information.
Notes:
1. The programming convention is as follows:-
Logic 0:Connect to pin 12; Sense(–).
Logic 1:Open circuit/open drain (See Note 2)
2. For optimal output voltage accuracy Sense(–) (pin 12)
should always be used as the logic ‘0’ reference. The
input/output ground (pins 13-19) can also be used if
pin 12 is connected to pin 13 external to the module.
3. Do not connect pull-up resistors to the voltage
programming pins.
Figure 4-1
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, or IRLML2402 are examples of appropriate
devices.
Active Voltage Programming:
Special precautions should be taken when making changes
to the output voltage progam code while the unit is
powered. This activity can induce current transients
through the device as a 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 100s
settling time between each program state is also recom-
mended. Making non-incremental changes to VID3 or
VID4 is discouraged.
When active devices are used to program the output
voltage, their state should be asserted prior to the input
power being applied. One approach is to pull STBY (pin 5)
control to GND prior to power up. After the host board
has then asserted the program code, the ground signal
to pin 5 can be removed. This will allow the regulator to
intiate a clean soft-start power-up to the desired program
voltage. For more information on the use of the Standby
function, consult the related application note, “Using
the Standby Function on the PT7670 Series of 30-A
Switching Regulators.”
C
out
+
C
in
+
1 H
(Optional)
V
IN
COM
STBY
L
O
A
D
Q
1
L
1
Sense(–)
V
OUT
Power GND
PT7671
43
1
26
20–25
12
513–19
7–11
V
OUT
V
IN
GND
SNS(+)
SNS(–)
STBY
VID4 - VID0
2
6
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相关代理商/技术参数 |
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| PT7675C | 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 |
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