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A7110E5VR-R 参数 Datasheet PDF下载

A7110E5VR-R图片预览
型号: A7110E5VR-R
PDF下载: 下载PDF文件 查看货源
内容描述: [DC-DC CONVERTER/ BUCK (STEP-DOWN)]
分类和应用: DC-DC转换器
文件页数/大小: 11 页 / 278 K
品牌: AITSEMI [ AiT Semiconductor ]
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A7110  
DC-DC CONVERTER/ BUCK (STEP-DOWN)  
1.0A 1.5MHz SYNCHRONOUS  
AiT Semiconductor Inc.  
www.ait-ic.com  
DETAILED INFORMATION  
The A7110 high-efficiency switching regulator is a small, simple, DC-to-DC step-down converter capable of  
delivering up to 1.0A of output current. The device operates in pulse-width modulation (PWM) at 1.5MHz from  
a 2.5V to 6.5V input voltage and provides an output voltage from 0.6V to VIN, making the A7110 ideal for  
on-board post-regulation applications. An internal synchronous rectifier improves efficiency and eliminates the  
typical Schottky free-wheeling diode. Using the on resistance of the internal high-side MOSFET to sense  
switching currents eliminates current-sense resistors, further improving efficiency and cost.  
Loop Operation  
A7110 uses a PWM current-mode control scheme. An open-loop comparator compares the integrated  
voltage-feedback signal against the sum of the amplified current-sense signal and the slope compensation  
ramp. At each rising edge of the internal clock, the internal high-side MOSFET turns on until the PWM  
comparator terminates the on cycle. During this on-time, current ramps up through the inductor, sourcing  
current to the output and storing energy in the inductor. The current mode feedback system regulates the  
peak inductor current as a function of the output voltage error signal. During the off cycle, the internal  
high-side P-channel MOSFET turns off, and the internal low-side N-channel MOSFET turns on. The inductor  
releases the stored energy as its current ramps down while still providing current to the output.  
Current Sense  
An internal current-sense amplifier senses the current through the high-side MOSFET during on time and  
produces a proportional current signal, which is used to sum with the slope compensation signal. The  
summed signal then is compared with the error amplifier output by the PWM comparator to terminate the on  
cycle.  
Current Limit  
There is a cycle-by-cycle current limit on the high-side MOSFET of 1.0A(min). When the current flowing out of  
SW exceeds this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. A7110 utilizes  
a frequency fold-back mode to prevent overheating during short-circuit output conditions. The device enters  
frequency fold-back mode when the FB voltage drops below 200mV, limiting the current to 1.0A (min) and  
reducing power dissipation. Normal operation resumes upon removal of the short-circuit condition.  
REV2.1  
- JAN 2009 RELEASED, MAY 2016 UPDATED -  
- 7 -