Datasheet > AOZ1934

AOZ1934

更新时间： 2022-04-15 12:17:37

品牌	Logo	应用领域
美国万代 - AOS		驱动器
页数	文件大小	规格书
14页	776K
描述
High Efficiency Boost 20-, 30- LED Driver

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中文翻译

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AOZ1934 数据手册

AOZ1935

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

Capacitor Selection

Small size ceramic capacitors with low ESR are ideal for

all the applications. A 10uF input capacitor at VIN, a 1µF

input capacitor at AVCC and a 1µF 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.

⎛

⎞

⎟

⎠

------

= 1.2 × 1 +

⎜

OUT_OV

⎝

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.

Diode Selection

Thermal Shutdown

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.

Thermal shutdown feature is also included in the

AOZ1934/5. When IC junction temperature (T ) reaches

150°C, the IC will immediately enter shutdown mode.

Once T drops 15°C to around 135°C, the IC will be back

to normal operation.

Inductor Selection

Layout Considerations

A 4.7µH to 10µH 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.

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. 1.0 August 2010

www.aosmd.com

Page 12 of 14

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