SC1175CSWTRT

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Number of Outputs:	2
Output Phases:	2
Voltage - Supply (Vcc/Vdd):	4.2 V ~ 15 V
Frequency - Switching:	300kHz
Duty Cycle (Max):	95%
Synchronous Rectifier:	Yes
Clock Sync:	No
Serial Interfaces:	--
Control Features:	Enable, Power Good, Soft Start
Operating Temperature:	0°C ~ 85°C (TA)
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SO

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SC1175CSWTRT, a fully integrated DC/DC switch controller from Shenzhen MYC Electrics Co., Ltd., has been widely applied in areas such as telecom, personal electronic devices, industrial control systems and automotive electronics,where stability and high efficiency are required. This switch controller can also meet stringent immunity and transient requirements in harsh environments and can be used in various battery-powered portable systems.Working PrincipleThe SC1175CSWTRT is a highly integrated, voltage mode, constant frequency,current mode, DC/DC switch mode converter that operates with high accuracy and efficiency. Its main components are an integrated optimized current sensing module and a high- speed load control process. When the output voltage of the module is changed, the current sensing module detects the change and provides a voltage output which is proportional to the output current. The voltage is then used as the input to a PID control loop, and the output of the as the process output.The PID control loop then sets the duty ratio and phase angle for the converter to maintain a constant current power supply to the load. When the output current is altered, the process output changes accordingly and the PID control loop tracks the changes to maintain the constant output current. This ideal current loop control can reduce the current sensing circuitry and decrease the power dissipated in the voltage regulator.The SC1175CSWTRT is also able to detect a fault with an output overvoltage event due to its adjustable current limit, which shuts down the operation as soon as the output overvoltage event occurs. This fault protection feature prevents overvoltage conditions on the load to ensure that the device operates safely and reliably over a wide range of input voltages and supply conditions.The SC1175CSWTRT also has active voltage sharing that enables multiple converters to source a single load with equal output current. This can reduce the design and component count and provide improved load regulation.The SC1175CSWTRT has a low quiescent current operating performance with high efficiency. It includes an internal linear regulator, providing soft-start and line/load conditioning features which help reduce the start-up time as well as eliminate components and power dissipation. The SC1175CSWTRT is designed for high-performance applications, and can be used in extreme environments and power supply conditions. Its integrated design and digital control features provide constant current control with high accuracy and efficiency, eliminating noise and ripple. It is ideal for controlling the output of a power supply in areas such as server farms, LED lighting and LED traffic interface systems.ConclusionThe SC1175CSWTRT is an ideal controller for DC/DC switching regulator applications that require high accuracy, efficiency and immunity in harsh environments. With its integrated design, digital control and active voltage sharing, it is capable of providing a reliable and precise output voltage even under varying input voltages and load conditions. Its low quiescent current operating performance helps increase the efficiency and reliability, while its soft-start and line/load conditioning features help reduce start-up time. Its fault protection feature prevents output overvoltage conditions, ensuring safe operation over a wide range of input voltages and supply conditions.

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