Datasheet > ADT7350

ADT7350

更新时间： 2022-10-09 10:38:19

品牌	Logo	应用领域
ADTECH		转换器开关
页数	文件大小	规格书
9页	333K
描述
a step-down converter with integrated switching MOSFET

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ADT7350 数据手册

ADT7350

DETAILED DESCRIPTION

UVLO (Under Voltage Lock Out)

ADT7350 can monitor the battery output voltage. If the battery output voltage is under 3.8V . The

ADT7350 goes to the UVLO status to save the power consumption of applications.

Oscillator

The ADT7350 has a fixed frequency generator (typical 1.4MHz) and also automatically changes the

operating frequency in accordance with feedback voltage (0.81V) for protecting the load. If the feedback

voltage is under 0.4V, the operating frequency changes to one third of fixed operating frequency. (Typical

460KHz)

Error Amplifier

The high gain error amplifier integrate the error signal from which the difference of reference voltage and

feedback voltage. The summed output Error signal compares with PWM Ramp signal. It provides accuracy

of the voltage feedback loop regulation. The feedback voltage of ADT7350 is typical 0.81V.

Current sense Amplifier

The current sense amplifier output is proportional to the current flowing into the inductor. This output goes

to the comparator to make a proper control signal. The ADT7350 has well compensated current slope

which is added into ramp generator circuit.

Compensation Network

The fixed frequency peak current mode control scheme to provide easy compensation for stability and fast

transient response. The cycle-by-cycle basis monitored peak current of inductor is compared with error

amplifier output voltage. The duty cycle is modulated based on the inductor’s peak current. The inductor

can be emulated to current source. So the inductor’s pole frequency goes to high frequency . It seems to be

one-pole system. The ADT7350 has a inner compensation network in error amplifier block.

* This specifications are subject to be changed without notice

http://www.ad-tech.co.kr

Sep. 9. 2010 / Rev. 0.0

8/9

1...5 6 789

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