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參數(shù)資料
| 型號(hào)： | PT4413N |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 100-Watt 48-V Input Isolated DC/DC Converter |
| 中文描述： | 100瓦48 - V輸入隔離DC / DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 243K |
| 代理商： | PT4413N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4400/4410 Series
Pin-Coded Output Voltage Adjustment on the
PT4400/4410 Series of DC/DC Converters
These DC/DC converters have a programmable output
voltage. In each case the desired output voltage must be
selected from one of a number of discrete voltages using
the voltage programming control pins. Depending on
each model’s resolution and adjustment range, there are
up to five control pins. They are identified
VID0–VID4
(pins 7–11) respectively. By selectively strapping these
control pins to
(–)Remote Sense
(pin 12), the output voltage
can be programmed to one of up to 32 different values
over the defined output voltage range. The program code
and output voltage range of the PT4401/4411 is also
compatible with the “Voltage ID” code defined in the
Intel VRM 8.2 specification. Refer to the applicable
product specification sheet for the program code.
Notes:
1. The programming convention is as follows:-
Logic 0:
Connect to pin 12 (–Remote Sense).
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) as the logic “0” reference. While -Vout
(pins 13-16) can also be used for programming, doing so
will degrade the voltage selection accuracy and load
regulation of the product.
4. When VID0–VID4 are all open circuit (logic 1), the
output voltage is undefined. In this state the output
voltage of the converter cannot be guaranteed, and can
vary with output load and input voltage.
5. On all models other than the PT4401/4411, the contol
Figure 1
input VID4 (pin 11) is internally disabled and is not
functional.
6. 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 or IRLML2402 are examples of appropriate
devices.
Active Voltage Programming:
Special precautions should be taken when making changes
to the voltage progam code while the output is active.
This activity induces a transient, which may activate
the module’s output over-voltage (OV) protection. Once
triggered the OV protection circuit latches the output
off, and requires the momentary removal of input power
to reset the module. OV protection trips can be avoided
by limiting the output voltage adjustment to no more
than a 15 % change from the initial voltage. Large transi-
tions are best made with a series of incremental changes,
allowing 100 μs settling time between each program state.
When using active devices to program the output voltage,
their state should be asserted prior to input power being
applied. An alternative is to pull pin 1 (
Remote On/Off
) to
-V
in
(pins 2, 3) during the application of power, assert the
required program code, and then release pin 1. The mod-
ule will than initiate a soft-start power-up to the desired
program voltage.
L
O
A
D
PT4400
+V
sns
+V
out
-V
out
-V
sns
21
17
–
20
13
–
16
12
7
11
8
10
9
VID0 - VID4
+V
in
–
V
in
4, 5
2, 3
1
Remote
On/Off
PROGRAMMING PINS
+V
OUT
+V
IN
–
V
IN
–
REMOTE SENSE
+ REMOTE SENSE
C
o
+
Q1
BSS138
INH
–
V
OUT
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