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參數(shù)資料
| 型號： | PT7681N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 30 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, MSMA27 |
| 封裝： | ROHS COMPLIANT, METAL, SIP-27 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大小： | 305K |
| 代理商： | PT7681N |
For technical support and more information, see inside back cover or visit www.ti.com
* For STBY pin:
open =output enabled
ground =output disabled.
Pin-Out Information
Pin Function
1VID0
2VID1
3VID2
4VID3
5
STBY *
6
MARGDN
7Vin
8Vin
9Vin
10
Vin
11
Vin
12
Sense(–)
13
GND
14
GND
Pin Function
15
GND
16
GND
17
GND
18
GND
19
GND
20
Vout
21
Vout
22
Vout
23
Vout
24
Vout
25
Vout
26
Sense(+)
27
MARGUP
PT7681—5V
Programming Information
VID3 VID2 VID1 VID0
Vout
1111
2.00V
1110
2.10V
1101
2.20V
1100
2.30V
1011
2.40V
1010
2.50V
1001
2.60V
1000
2.70V
0111
2.80V
0110
2.90V
0101
3.00V
0100
3.10V
0011
3.20V
0010
3.30V
0001
3.40V
0000
3.50V
Logic 0 = Pin 12 potential (Rem Sense Gnd)
Logic 1 = Open circuit (no pull-up resistors)
VID 3 must not be changed while the unit is operating.
Pin Descriptions
Vin:
The positive input voltage power node to the mod-
ule, which is referenced to common GND.
GND:
This is the common ground connection for the
‘Vin’ and ‘Vout’ power connections. It is also the 0VDC
reference for the ‘STBY’ control input.
STBY:
The STBY pin is an open-collector/drain nega-
tive logic input that is referenced to GND. Applying a
ground signal to this input will disable the module’s
output and place the regulator in “standby” mode.
When in standby, the input current drawn by the regula-
tor is significantly reduced. If the STBY input is left
open circuit, the module will produce an output when-
ever a valid input source is applied.
VID0–VID3:
Selects the set-point output voltage of the
regulator according to the applicable program code (See
programming information). Each input, VID0 through
VID3, must either be connected to ‘Sense(–)’ or left open
circuit.
Vout:
The regulated positive power output with respect
to the GND node. The set point voltage at this node is
defined by the status of the pins VID0 through VID3.
Sense(+):
Provides the regulator with the capability to
regulate the set-point voltage at the load. When used
with ‘Sense(–)’, the regulation circuitry will compensate
for voltage drop between the converter and the load.
This pin may be left open circuit, but connecting it to
‘Vout’ will improve load regulation.
Sense(–):
This is the logic ‘0’ reference for the inputs
VID0 through VID3. It also provides the regulator with a
differential remote sense capability when used with the
‘Sense(+)’ input. For optimum output voltage accuracy
this pin should always be connected to GND.
MARGDN:
This is an open-collector/drain negative logic
input. Applying a ground signal to this input increases
the output voltage of the module by up to 5%. The con-
trol provides a convenient method for testing the operation
of the load circuit over its supply voltage tolerance mar-
gins.
MARGUP:
An open-collector/drain negative logic input
that operates similar to the MARGDN control. Applying
a ground signal to this input automatically decreases the
output by up to 5%.
30-A Programmable ISR
With Margin Up/Down Controls
SLTS177
B - DECEMBER 2002 - REVISED JULY 2006
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