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LMZ20502EVM Folha de dados(PDF) 2 Page - Texas Instruments

Nome de Peças LMZ20502EVM
Descrição Electrónicos  LMZ20502 SIMPLE SWITCHER짰 Evaluation Board
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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LMZ20502EVM Folha de dados(HTML) 2 Page - Texas Instruments

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OFF
POSITION
ON
POSITION
EN
JUMPER
EN
JUMPER
OUT
OUT
IN
IN
V
I
I
V
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˜ K
Set-Up and Operation
www.ti.com
3
Set-Up and Operation
Please refer to Figure 2 through Figure 5 while setting up the EVM module. All that is required is to apply
an input supply to the module, connect the desired load and select the enable and mode jumper positions.
The input supply is connected between the VIN and GND pins. The load is connected between the VOUT
and GND pins. The output voltage can be monitored between the VOUTS and GNDS pins, or at the test
points provided on the module.
Figure 2 shows the enable jumper configuration; the left side of the figure shows the jumper in the "ON"
position. While the right side of the figure shows the "OFF" position. Figure 3 shows the MODE selection
jumpers. With the jumper in the "PFM" position, the device will automatically switch between PFM and
PWM mode depending on load. With the jumper in the "PWM" position, the part will remain in constant
frequency PWM mode regardless of load.
To remotely enable the module, remove the EN jumper and connect the control signal to the EN pad on
the edge connector. A valid input voltage must be present on VIN before the EN pin is asserted. The
maximum voltage on this pin is 5.5V or VIN, whichever is smaller.
A three pin header is provided to allow the user to inject a signal from a network analyzer into the control
loop of the regulator. The connections are shown in Figure 4
The expected input current to the module can be approximated by using Equation 1
(1)
In some cases an electrolytic capacitor may be required on the input to the module. This is especially true
if long leads/traces are used to connect the input supply to the device. The moderate ESR of this
capacitor can help to damp any ringing on the input supply caused by long power leads. A value of about
100µF is usually adequate.
Figure 2. EN Jumper Configuration
2
LMZ20502 SIMPLE SWITCHER® Evaluation Board
SNVU181 – February 2012
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Copyright © 2012, Texas Instruments Incorporated


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