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AOZ1935
V OUT_OV = 1.2 ? ? 1 + ------ 1 - ?
to program a lower over-voltage threshold using the OV
pin. The internal reference voltage to trigger OVP at OV
pin is 1.2V; a resistor divider can be connected as shown
in the following figure and the over voltage threshold can
be derived as
? R ?
? R 2 ?
To limit the leakage current through the divider, make
sure 10M > R1+R2 > 1M. The lower value of the internal
40V OVP and the external OVP set by the resistor divider
determines the system OVP value.
Thermal Shutdown
Thermal shutdown feature is also included in the
AOZ1934/5. When IC junction temperature (T J ) reaches
150 ? C, the IC will immediately enter shutdown mode.
Once T J drops 15 ? C to around 135 ? C, the IC will be back
to normal operation.
Inductor Selection
A 4.7 μ H to 10 μ H inductor is recommended for all the
applications. If high efficiency is a critical requirement, a
low DCR inductor should be selected. The inductor ’s
saturation current rating should also exceed the peak
input current.
Capacitor Selection
Small size ceramic capacitors with low ESR are ideal for
all the applications. A 10uF input capacitor at VIN, a 1 μ F
input capacitor at AVCC and a 1 μ F output capacitor at
VOUT are suggested. The voltage rating of these
capacitors should exceed the maximum possible voltage
at the corresponding pins. For example, for the
application of 3P10S LEDs from input voltage range of
5V to 22V and AVCC = 3.3V, a 25V capacitor is
recommended at the VIN pin, a 50V capacitor is
recommended at the VOUT pin, and a 10V capacitor is
recommended at the AVCC pin.
Diode Selection
Using a schottky diode is recommended because of its
low forward voltage drop and fast reverse recovery time.
The current rating of the schottky diode should exceed
the peak current of the boost converter. The voltage
rating should also exceed the target output voltage. For
applications driving 10 LEDs in series, 50V voltage rating
schottky diode is recommended.
Layout Considerations
PCB layout is very important for high frequency switching
regulators in order to keep the loop stable and minimize
noise. The AVCC pin’s capacitor should be very close to
the IC to get the best decoupling. The path of the
inductor, schottky diode and output capacitor should be
kept as short as possible to minimize noise and ringing.
Please see the AOZ1934/5 evaluation document for
detailed PCB layout guidelines.
Rev. 1.2 June 2013
www.aosmd.com
Page 12 of 15
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