开关电源" title="开关电源">开关电源" title="开关电源">开关电源(SMPS)降压控制器,2.5A SMPS降压稳压器和两个低压降(LDO)线性稳压器控制器,和超低静态电流的NCV861x一起能组成8输出的无线系统或仪表盘电源解决方案.器件满足ES−XW7T−1A278−AB测试脉冲G负载条件,VIN工作电压9.0V-18.0V.本文介绍了NCV8855主要特性, 应用电路/方框图, 汽车无线电系统框图以及NCV8855评估板电路图与材料清单.

The NCV8855 is a multiple output controller / regulator IC with an integrated high−side load switch. The NCV8855 addresses automotive radio system and instrument cluster power supply requirements. In addition to the high−side load switch, the NCV8855 includes a switch−mode power supply (SMPS) buck controller, a 2.5 A SMPS buck regulator and two low dropout (LDO) linear regulator controllers. The NCV8855 in combination with the ultra−low quiescent current NCV861x IC forms an eight−output automotive radio or instrument cluster power solution. The NCV8855 has an internally set switching frequency of 170 kHz, with a SYNC pin for external frequency synchronization.

The NCV8855 is intended to supply power to various loads, such as a tuner, CD logic, audio processor and CD / tape control within a car radio. The high−side switch can be used for a CD / tape mechanism or switching an electrically−powered antenna or display unit. In an  instrument cluster application, the NCV8855 can be used to power graphics display, flash memory and CAN transceivers. In addition, the high−side switch can be used to limit power to a TFT display during a battery over−voltage condition.

NCV8855主要特性:

• < 1 uA Shutdown Current

• Meets ES−XW7T−1A278−AB Test Pulse G – Loaded Conditions

• VIN Operating Range 9.0 to 18.0 V

• 1 SMPS Controller with Adjustable Current Limit

• 1 SMPS Regulator with Internal 300 m  NMOS Switch

• 2 LDO Controllers with Current Limit and Short Circuit Protection

• 1 High−side Load Switch with Internal 300 m  NMOS FET

• Adjustable Output Voltage for All Controllers / Regulators

• 800 mV, +/-1% Reference Voltage

• System Enable Pin

• Single Enable Pin for Both LDO Controllers

• Independent Enable for High−side Load Switch

• Thermal Shutdown with Thermal Warning Indicator

• This is a Pb−Free Device

NCV8855应用:

• Automotive Radio

• Instrument Cluster, Driver Information System (DIS)

图1. NCV8855应用电路/方框图

图2. NCV8855和NCV8612汽车无线电系统框图
NCV8855评估板

图3.评估板NCV8855BMNR2GEV外形图

图4.评估板NCV8855BMNR2GEV电路图
评估板NCV8855BMNR2GEV材料清单:






详情请见:
http://www.onsemi.cn/pub_link/Collateral/EVBUM2120-D.PDF
和
http://www.onsemi.cn/pub_link/Collateral/NCV8855BMNR2GEVB_SCHEMATIC.PDF