IR IR3513单片单相电源控制方案

IR公司的IR3513控制IC集成了栅极驱动器,电流检测/共享以及PWM,可以构成单独使用的单相稳压器或和其它IC接口,开发出多相电源解决方案. IR3513支持输出电压从0.8V到5.1V,系统设定电精度+/-0.5%. 每相的开关频率从250 KHz 到1.5 MHz可编,菊花链数字相位时序在200kHz到9MHz间可编程.本文介绍了IR3513的主要特性,方框图和应用电路以及采用IR3513和IR3505的POL模块电路图.

The IR3513 Control IC provides overall control of a scalable number of phases along with an internal gate driver, current sense/sharing, and PWM. This allows the IR3513 to implement a stand-alone single-phase regulator or interface with additional Phase ICs to develop a power solution with any number of phases. With this arrangement, the final solution requires only 1 IC per phase to deploy 1 to X phases. Other approaches require a control IC plus 1 to X driver ICs or scalable “all-in-one” ICs that do not utilize all IC pins or circuitry leading to increased solution cost and size.



IR3513主要特性:

0.8V reference supports 0.8V to 5.1V output voltage with +/-0.5% system set point accuracy
Dynamic margin function provides ± 5 % reference offset
1 (stand-alone) to X phase operation with additional Phase IC
Programmable 250 KHz to 9 Mhz daisy-chain digital phase timing provides a per phase switching frequency of 250 KHz to 1.5 MHz with no external components
Differential remote sense amplifier with 100kohm input impedance
IC bias linear regulator control with programmable output voltage and UVLO
Programmable converter current limit during soft-start, hiccup with delay during normal operation
Over voltage protection communicated to Phase ICs
System over voltage signal protects against failures such as a shorted high side MOSFET
Detection and protection of open remote sense lines
Open control loop protection
7V/2A gate drivers (4A GATEL sink current)
Integrated boot-strap synchronous PFET
Small thermally enhanced 32L 5 x 5mm MLPQ package



图1.IR3513应用电路



图2.IR3513电源系统测试点测试电路



图3.PWM 方框图



图4.IR3513 方框图



图5.采用IR3513和IR3505的POL模块电路图(可编程输出电压和冗余OVP检测)