rohm公司的BD9G341AEFJ是集成了80V/3.5A/150mΩ的N沟FET的输入12V-76V输出3A电流的单路降压转换器,开关频率从50kHz到750kHz,具有多种保护功能,主要用在工业分布式电源,汽车电子和以电池为能源的设备.本文介绍了BD9G341AEFJ主要特性,框图和应用电路,以及BD9G341AEFJ评估板主要特性,电路图,材料清单和PCB设计图.

The BD9G341AEFJ is a buck switching regulator with integrated 150mΩ power MOSFET. Current mode architecture provides fast transient response and a simple phase compensation setup. The operating frequency is programmable from 50kHz to 750kHz. Additional protection features are included such as Over Current Protection, Thermal shutdown and Under voltage lockout. The under voltage lockout and hysteresis can be set by external resistor.

BD9G341AEFJ主要特性:

Wide input voltage range from 12V to 76V.
Integrated 80V/3.5A/150mΩ NchFET.
Current mode.
Variable frequency from 50kHz to 750kHz.
Accurate reference voltage.( 1.0 V±1.5 %).
Precision EN threshold ( ±3%).
Soft-start function
0uA Standby current
Over Current Protection (OCP),
Under VoltageLockout(UVLO), Thermal-Shutdown(TSD),OverVoltage Protection (OVP)
Thermally enhanced HTSOP-J8 package

BD9G341AEFJ主要指标：

■ Input voltage 12 to 76[V
■ Ref voltage(Ta=25℃) ±1.5[%]
(Ta=-40 to 85℃) ±2.0[%]
■ Max output current 3 [A] (Max.)
■ Operating Temperature -40°C to 85℃
■ Max junction temperature 150℃

BD9G341AEFJ应用:

Industrial distributed power applications.
Automotive Application
Battery powered equipment.

图1.BD9G341AEFJ框图

图2.BD9G341AEFJ典型应用电路图

BD9G341AEFJ评估板

This evaluation board has been developed for ROHM’s non-synchronous buck DC/DC converter customers evaluating BD9G341AEFJ. While the BD9G341AEFJ accepts a power supply input range of 12V to 76V, and generates output voltages from 1V to Vcc, this evaluation board is setup for the same input voltage range and a fixed output of 5V can be produced. The IC has internal 150mΩ N-channel MOSFET and the operating frequency is programmable from 50kHz to 750kHz. A fixed Soft Start circuit prevents inrush current during startup along with UVLO (low voltage error prevention circuit) and TSD (thermal shutdown detection), OCP (over current protection), OVP (over voltage protection) protection circuits. The under voltage lockout and hysteresis can be set by external resistor using EN pin. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption.

图3.BD9G341AEFJ评估板外形图

图4.BD9G341AEFJ评估板电路图

图5.BD9G341AEFJ评估板I/O电路图
BD9G341AEFJ评估板材料清单:


图6.BD9G341AEFJ评估板PCB设计图