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LT3592IMSE Scheda tecnica(PDF) 14 Page - Linear Technology

Il numero della parte LT3592IMSE
Spiegazioni elettronici  500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming
PDF  24 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LT3592IMSE Scheda tecnica(HTML) 14 Page - Linear Technology

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LT3592
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3592fa
APPLICATIONS INFORMATION
BOOST Pin Considerations
The capacitor C3 and an internal Schottky diode from
the CAP to the BOOST pin are used to generate a boost
voltage that is higher than the input voltage. An external
fast switching Schottky diode (such as the BAS70) can be
used in parallel with the internal diode to make this boost
circuit even more effective. In most cases, a 0.1μF capaci-
tor works well for the boost circuit. The BOOST pin must
be at least 2.5V above the SW pin for best efficiency. For
outputs of 3.3V and above, the 0.1μF cap and the internal
boost diode will be effective. For 3V to 3.3V outputs, use
a 0.22μF capacitor. For outputs between 2.5V and 3V,
use a 0.47μF capacitor and and external Schottky diode
(such as a BAS70) connected in parallel with the internal
Schottky diode, anode to CAP and cathode to BOOST. For
lower input voltages, the external boost Schottky diode’s
anode can be tied to the input voltage. This connection
is not as efficient as the others because the BOOST pin
current comes from a higher voltage. The user must also
be sure that the maximum voltage rating of the BOOST
pin is not exceeded.
Figure 4. Transient Load Response of the LT3592 with Different Output Capacitors
Figure 5. Two Circuits for Generating the Boost Voltage
VIN
CAP
BOOST
GND
SW
DA
BATT
LT3592
(5a)
D2
C3
3592 F05a
VIN
CAP
BOOST
GND
SW
BATT
LT3592
(5b)
D2
C3
3592 F05b
DA
100μs/DIV
VSW
VOUT
ILED
100μs/DIV
VSW
3592 F04
VOUT
ILED
C = 4.7μF
C = 10μF



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