Datasheet > A7330MP8R

A7330MP8R

更新时间： 2022-02-26 12:30:38

品牌	Logo	应用领域
创瑞 - AITSEMI		DC-DC转换器
页数	文件大小	规格书
14页	304K
描述
DC-DC CONVERTER BUCK SENSORLESS CC/CV

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A7330MP8R 数据手册

A7330

DC-DC CONVERTER BUCK (STEP-DOWN)

SENSORLESS CC/CV

AiT Semiconductor Inc.

www.ait-ic.com

DETAILED INFORMATION

Application Information

CV/CC Loop Regulation

As seen in Function Block Diagram, the A7330 is a peak current mode pulse width modulation (PWM)

converter with CC and CV control. The converter operates as follows:

A switching cycle starts when the falling edge of the Oscillator clock output causes the High-Side Power

Switch to turn on and the Low-Side Power Switch to turn off. With the SW side of the inductor now connected

to IN, the inductor current ramps up to store energy in the magnetic field. The inductor current level is

measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resulting summation

is higher than the COMP voltage, the output of the PWM Comparator goes high. When this happens or when

Oscillator clock output goes high, the High-Side Power Switch turns off.

At this point, the SW side of the inductor swings to a diode voltage below ground, causing the inductor current

to decrease and magnetic energy to be transferred to output. This state continues until the cycle starts again.

The High-Side Power Switch is driven by logic using HSB as the positive rail. This pin is charged to V_SW+5V

when the Low-Side Power Switch turns on. The COMP voltage is the integration of the error between FB input

and the internal 0.8V reference. If FB is lower than the reference voltage, COMP tends to go higher to

increase current to the output. Output current will increase until it reaches the CC limit set by the I_SETresistor.

At this point, the device will transition from regulating output voltage to regulating output current, and the

output voltage will drop with increasing load. The Oscillator normally switches at 125kHz. However, if FB

voltage is less than 0.6V, then the switching frequency decreases until it reaches a typical value of 18kHz at

V_FB= 0.15V.

Over Voltage Protection

The A7330 has an OVP pin. If the voltage at this pin exceeds 0.8V, the IC shuts down high-side switch. There

is a 2μA pull-up current at this pin.

Thermal Shutdown

The A7330 disables switching when its junction temperature exceeds 151℃ and resumes when the

temperature has dropped by 22℃.

Output Voltage Setting

The figure shows the connections for setting the output voltage.

REV1.0

- JAN 2016 RELEASED -

- 6 -

1...3 4 567 8 9...14

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