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LMZ34002EVM-001 Folha de dados(PDF) 2 Page - Texas Instruments

Nome de Peças LMZ34002EVM-001
Descrição Electrónicos  Negative Output Voltage Simple Switcher짰 Power Module Evaluation Module
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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Test Point Description
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4
Test Point Description
A number of wire loop test points have been provided as convenient connection points for DVMs or
oscilloscope probes to aid in the evaluation of this device. A description of each test point is given in the
following text.
V
IN
Input voltage monitoring point. Connect DVM to this point for efficiency measurements.
–V
OUT
Negative output voltage monitoring point. Connect DVM to this point for efficiency, line
regulation, and load regulation measurements.
J1 (V
IN)
Connect an oscilloscope probe with a short grounding tip to this pair of holes to
measure input ripple voltage.
J2 (–V
OUT)
Connect an oscilloscope probe with a short grounding tip to this pair of holes to
measure output ripple voltage and transient response.
SS
The voltage on the soft-start capacitor can be monitored here.
INH / UVLO
Ground this terminal to Inhibit power conversion via an on-board level-shifter. When
open, the voltage on this pin is the voltage of the UVLO resistor divider network.
GND
Ground points for meters and oscilloscope probes.
PH
A via test point for monitoring the Phase pin (Switching Node) of the device with an
oscilloscope. This test point can be used to measure the switching frequency of the
regulator. Only a x10 oscilloscope probe should be used to monitor this point. The
operation of the device can be affected by the stray capacitance of conventional
cables or x1 probes.
5
Operation Notes
The UVLO threshold of the factory-stock EVM is approximately 4.5 V. The input voltage must be above
the UVLO threshold before power conversion begins. The UVLO threshold is set by resistors R6 and R7.
See the LMZ34002 datasheet for information on setting the UVLO voltage.
When the input voltage rises above the UVLO threshold, power conversion begins and the output voltage
will ramp to its final value in approximately 10 ms. If desired, this soft-start interval can be increased by
adding capacitance at location C4 on the bottom side of the EVM. This location is not populated on the
factory-stock EVM.
The switching frequency of the factory-stock EVM is set to 800 kHz (typ) by populating resistor R8 with a
0-
Ω resistor. The switching frequency can be changed to 500 kHz by changing R8 to 93.1 kΩ. See the
LMZ34002 datasheet for switching frequency limits.
The CLK input pin (pin 31) has not been brought out to a test point on the factory-stock EVM.
The LMZ34002 is not designed to endure a sustained short circuit on its output. It survives momentary
shorts (< 5 seconds), but sustained short circuits may cause permanent damage to the device.
The maximum output current is dependent on the input and output voltage. Figure 1 shows the output
current limits for four common output voltages over the input voltage range.
2
Using the LMZ34002: Negative Output Voltage Simple Switcher® Power
SNVU297 – JULY 2013
Module Evaluation Module
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Copyright © 2013, Texas Instruments Incorporated


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