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LT3592IMSE 数据表(PDF) 20 Page - Linear Integrated Systems

部件名 LT3592IMSE
功能描述  500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming
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制造商  LINEAR [Linear Integrated Systems]
网页  http://www.linearsystems.com
标志 LINEAR - Linear Integrated Systems

LT3592IMSE 数据表(HTML) 20 Page - Linear Integrated Systems

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LT3592
20
3592fc
APPLICATIONS INFORMATION
Figure 12. Switching Transient When Going from 50mA to 500mA Current and Back in Voltage Mode
their maximum voltage capability. If a capacitor with a
lower voltage rating is found to not be stable in a design,
it will often result in a smaller solution to choose a larger
capacitor value of the same voltage rating than to choose
one of the same capacitance and higher voltage rating. For
example, a 10μF, 10V ceramic capacitor might be smaller
than a 4.7μF, 16V part, if a 4.7μF, 10V capacitor is found
to not be adequate in a given application. The LT3592HV
can tolerate sustained output voltages of up to 25V. For
output voltages above 12V, use an external Schottky diode
for the boost circuit with the anode tied to CAP and the
cathode tied to BOOST (as shown in Figure 13).
Transient Performance with Voltage Control Loop
The voltage control loop transient characteristics are similar
to, but not identical to the current control loop. Figure 12
shows the transient for a 12V input application running at
900kHz with a 6.8μH inductor and a 4.7μF ceramic output
capacitor. The LT3592 is in BRIGHT (500mA) mode but
the current load is switched from 50mA to 450mA and
back, so the current control loop is not active for either
current level and the output voltage is regulated through
the resistive voltage divider to the FB pin.
Other Linear Technology Publications
Application Notes AN19, AN35, and AN44 contain more
detailed descriptions and design information for Step-down
regulators and other switching regulators. The LT1376 data
sheet has an extensive discussion of output ripple, loop
compensation, and stability testing. Design Note DN100
shows how to generate a bipolar output supply using a
Step-down regulator.
10μs/DIV
VSW
10V/DIV
3592 F12
VOUT
1V/DIV
ILED
200mA/DIV
Figure 13. Boost Circuit with External Schottky Diode for Output Voltages Above 12V
VIN
CAP
BOOST
GND
SW
DA
BATT
LT3592
D2
C3
3592 F13


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