Datasheet > MG39U301ASC1

MG39U301ASC1

更新时间： 2022-02-26 14:06:07

品牌	Logo	应用领域
笙泉 - MEGAWIN		/
页数	文件大小	规格书
12页	320K
描述
Open loop current peak detector

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MG39U301ASC1 数据手册

Buck Driver Example 2

7 Application Information

Input Voltage Regulator

The MG39U301 integrates one high voltage regulator to generate the power for internal core logic. The

internal power is taken from the AC line directly. Extra auxiliary transformer is not needed for the supply. When a

voltage (7~500V) is applied at the VIN pin, the regulator maintains a constant 5.6V at the VDD pin. The VDD pin

must be bypassed by a low ESR capacitor to provide a low impedance path for the high frequency current of the

output date driver.

Since the current driving capability of the regulator is limited to around 0.7mA. It’s not suitable for driving the

external components. User must make sure the switching frequency should not be too high and the load at the

GATE pin should not be too heavy.

It’s recommended to add a series resistor between V_INDCand VIN pin to protect the IC. Basically, several

ten K to 100K ohms are recommended. The voltage drop on the resistor can be calculated as V_RDROP= I_OPx R_VIN

For large I_LEDapplication, it’s recommended to add a pull-high resistor (R_P) between V_INDCand VDD pin to

provide more driving current.

Selection of the Switching Control Scheme

The MG39U301 provides two control schemes, constant frequency and constant off time. For a buck

converter, the duty of PWM control signal is determined as D = VO / VIN, where VO is the voltage drop on LED

strings (V_LED). For a heavy load application (large V_LEDdrop, D>0.45), user should select the constant off time

mode.

Selection of the Switching Frequency (F_S)

Rule of thumb, the range of 20KHz ~ 100KHz is recommended.

For detail frequency setting, please check application note “AN_MG39U301_ROSC SEL”.

GATE Output

The GATE output of the MG39U301 is used to drive an external MOSFET. It is recommended that the gate

charge Q^Gof the external MOSFET should satisfy the equation as below:

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MG39U301 Data Sheet

1...4 5 678 9 10...12

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