ETA3415
FUNCTIONAL BLOCK DIAGRAM
IN
EN
+
UVLO &
Thermal
shutdown
0. 6V Ref
ISense
-
+
-
+
-
EA
Anti-
ShootThrough
Driver
Σ
PWM
Logic
Comp
Network
SW
Slope Comp
+
3 MHzOSC
Vcomp
-
FB
GND
FUNCTIONAL DESCRIPTION
The ETA3415 high efficiency switching regulator is a small, simple, DC-to-DC step-down converter capable
of delivering up to 1A of output current. The device operates in pulse-width modulation (PWM) at 3MHz from
a 2.6V to 7V input voltage and provides an output voltage from 0.6V to VIN, making the ETA3415 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
ETA3415 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. When the current flowing out of SW exceeds
this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. ETA3415 utilizes a frequency
fold-back mode to prevent overheating during short-circuit output conditions. The device enters frequency fold-
www.etasolution.com
5
Empower, Transcend, Achieve!
ETA3415_REV1.7
5秒后页面跳转
STM32H743技术深度剖析与应用案例探索
LM321中文资料解析：引脚功能介绍、技术特点、技术特性分析
74HC14芯片资料介绍：性能特性分析、引脚介绍
LM1875芯片手册：功放参数分析、引脚说明、电路设计要点
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
