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參數(shù)資料
| 型號(hào)： | PT6705N |
| 英文描述： | 30V Single N-Channel HEXFET Power MOSFET in a TO-220AB package; Similar to IRL7833 with Lead Free Packaging |
| 中文描述： | 開(kāi)關(guān)電源控制器 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 152K |
| 代理商： | PT6705N |
Application Notes
continued
For technical support and more information, see inside back cover or visit www.ti.com
Pin-Coded Output Voltage Adjustment on the Non-
Isolated
“
Excalibur
”
Series ISRs
The PT6701/6702/6703, and PT6721/6722 Excalibur
ISRs incorporate a pin-coded control to program the
output voltage. Depending on the resolution and adjust-
ment range, there are up to five control pins. They are
identified VID0–VID4 (pins 3–7) respectively. When the
control pins are left open-circuit the ISR output will
regulate at its factory trimmed output voltage. By selec-
tively grounding VID0-VID4, the output voltage can be
programmed in incremental steps over the specified out-
put voltage range. The program code and output voltage
range of these ISRs may also be compatible with the “Volt-
age ID” specification defined for popular microprocessors.
Refer to Figure 1 below for the connection schematic, and
the applicable Data Sheet for the program code.
Notes:
1. The programming convention is as follows:-
Logic 0:
Connect to pin13 (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 13
(Remote Sense Ground) as the logic “0” reference. While
the regular ground (pins 14-18) can also be used for
programming, doing so will degrade the load regulation 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
ce
(sat) in
bipolar devices introduces errors in the device’s internal
voltage control circuit. 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
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
8 (STBY) to the device GND during the period that the
input voltage is applied to V
in
. Releasing pin 8 will then
allow the device output to initiate a soft-start power-up
to the new program voltage.
C
out
+
C
in
+
1
μ
H
(Optional)
V
in
COM
STBY
L
O
A
D
Q1
COM
V
out
PT6700
7
6
5
4
3
23
19-22
13
8
14-18
2
10-12
Vo
Vin
GND
SNS(+)
SNS(-)
Pwr
Good
STBY
VID4 - VID0
1
OVP
PT6701/6702/6703, & PT6721
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