參數(shù)資料
型號(hào): MAX4286EUT+T
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi): 緩沖放大器
英文描述: BUFFER AMPLIFIER, PDSO6
封裝: SOT-23, 6 PIN
文件頁(yè)數(shù): 3/7頁(yè)
文件大?。?/td> 1030K
代理商: MAX4286EUT+T
SHUNT
POSITION
CLK PIN
OSCILLATOR/CLOCK
OPERATION
Installed*
Connected
to GND
Internal oscillator
Not installed
Not con-
nected
External clock; apply a clock
signal to the CLK PCB pad
on the EV kit
CONFIGURATION
Full-wave
rectifier*
C7
Not
C8
Not
D1
D2
D3
D4
R7
Not
R8
Not
R9
R10
installed
installed
Installed
Installed
Installed
Installed
installed
installed
0
I
0
I
Half-wave
rectifier
Not
installed
Not
installed
Not
installed
Installed
Not
installed
Not
installed
0
I
Not
installed
0
I
0
I
Voltage doubler
Not
installed
Installed
Installed
Installed
Not
installed
Not
installed
0
I
Not
installed
0
I
Not
installed
Bipolar outputs
1
F
F
Not
installed
Installed
Installed
Installed
Installed
Not
installed
Installed
10k
I
0
I
Push-pull rectifier
Not
installed
Not
installed
Not
installed
Installed
Not
installed
Installed
Not
installed
0
I
0
I
0
I
SHUNT POSITION
1-2
2-3*
EN
PIN
DEVICE OPERATION
Disables the device
Enables the device
Connects to 5V
Connects to GND
SHUNT
POSITION
Installed
Not installed*
LDO’S EN PIN
LDO
OPERATION
Disables the LDO
Enables the LDO
Connects to GND
Not connected
_________________________________________________________________
Maxim Integrated Products
3
MAX13256 Evaluation Kit
Evaluates: MAX13256
On-Board LDO for
Disabling the MAX13256
The EV kit features an on-board 5V LDO (U2) for
disabling the MAX13256 and powering the LED con-
nected to
FAULT
. Install a shunt in the 1-2 position on
jumper JU1 to connect the
EN
pin of the device to the 5V
from the LDO output and disable the device. Ensure that
the voltage on
EN
never exceeds 6V.
Jumper JU4 is used to disable and enable the LDO, as
shown in Table 3.
Overcurrent Limiting
Resistor R1 sets the current-limit threshold to 650mA. To
change the current-limit threshold, replace resistor R1
with a 0603 surface-mount resistor using the following
equation:
)
LIM
R1 k
=650/I
(mA)
where I
LIM
is the desired current threshold in the range
of 215mA < I
LIM
< 650mA.
An overcurrent or overtemperature condition triggers a
fault on the device and the red LED (D5) turns on.
Evaluating Other
Transformer Configurations
The EV kit PCB layout provides an easy method to
reconfigure transformer T1 secondary windings for other
configurations, including a half-wave rectifier, voltage
doubler, bipolar outputs, and other full-wave-rectifier
configurations. Use Table 4 to reconfigure the device for
the appropriate output configuration.
Output Snubbers
For VDD greater than 27V, use a simple RC snubber
circuit on ST1 and ST2 to ensure that the peak voltage
is less than 40V during switching. Maxim recommends
installing 91
I
0603 surface-mount resistors at R5 and
R6, and 330pF 0603 surface-mount capacitors at C2 and
C3 when operating under these conditions.
Table 2. Clock Mode (JU2)
Table 4. Output Configurations
Table 1.
EN
(JU1)
Table 3. LDO Enable (JU4)
*
Default position.
*
Default position.
*
Default position.
*
Default position.
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