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LTM8005 Arkusz danych(PDF) 16 Page - Linear Technology

Numer części LTM8005
Szczegółowy opis  38VIN Boost 關Module Regulator for LED Drive with 10A Switch
Download  26 Pages
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LTM8005 Arkusz danych(HTML) 16 Page - Linear Technology

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LTM8005
16
8005f
For more information www.linear.com/LTM8005
APPLICATIONS INFORMATION
to do so with a 28µA source. Once above 1.7V, the pull-
up source is disabled and a discharge current of about
2.8µA is activated. While the SS pin is discharging, the
integrated switching MOSFET is turned off. When the
SS pin is discharged below about 0.2V, a new cycle is
initiated. This is hiccup mode operation. If the fault still
exists when SS crosses below about 0.2V, then a full SS
charge/discharge cycle has to complete before switching
is enabled.
If a resistor, typically 402k , is placed between the VREF
pin and SS pin to hold SS pin higher than 0.2V during
a fault, then the LTM8005 will enter latchoff mode with
switching stopped and the load disconnected from VOUT.
To exit latchoff mode, the EN/UVLO pin must be toggled
low to high.
Capacitor Selection Considerations
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable. X5R
and X7R types are stable over temperature and applied
voltage and give dependable service. Other types, includ-
ing Y5V and Z5U have very large temperature and voltage
coefficients of capacitance. In an application circuit they
may have only a small fraction of their nominal capaci-
tance resulting in much higher output voltage ripple than
expected.
Another precaution regarding ceramic capacitors con-
cerns the maximum input voltage rating of the LTM8005.
A ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8005 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safely section.
Input Capacitor Selection
The input capacitor supplies the transient input current for
the power inductor of the converter and must be placed
and sized according to the transient current require-
ments. The switching frequency, output current and tol-
erable input voltage ripple are key inputs to estimating
the capacitor value. An X7R type ceramic capacitor is a
good choice because it has the least variation with tem-
perature and DC bias. Typically, boost and SEPIC con-
verters require a lower value capacitor than a buck mode
converter.
In the buck mode configuration, the input capacitor has
large pulsed currents due to the current returned through
the Schottky diode when the switch is off. It is important
to place the capacitor as close as possible to the Schottky
diode and to the GND return of the switch. It is also impor-
tant to consider the ripple current rating of the capacitor.
For best reliability, this capacitor should have low ESR and
ESL and have an adequate ripple current rating.
Output Capacitor Selection
The selection of the output capacitor depends on the load
and converter configuration, i.e., step-up or step-down
and the operating frequency. For LED applications, the
equivalent resistance of the LED is typically low and the
output filter capacitor should be sized to attenuate the cur-
rent ripple. Use of an X5R or X7R type ceramic capacitor
is recommended.
To achieve the same LED ripple current, the required fil-
ter capacitor is larger in the boost and buck-boost mode
applications than that in the buck mode applications.
Lower operating frequencies will require proportionately
higher capacitor values. The component values shown in
the data sheet applications are appropriate to drive the
specified LED string. The product of the output capacitor
and LED string impedance decides the second dominant
pole in the LED current regulation loop. It is prudent to
validate the power supply with the actual load (or loads).
Inductor Selection
The inductor used with the LTM8005 should have a satu-
ration current rating appropriate to the peak inductor cur-
rent under all expected operating conditions. Choose an
inductor value based on operating frequency to provide
a peak-to-peak inductor ripple current appropriate to the
12A (typical) switch current limit and duty cycle.


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