参数资料
型号: NCP5314FTR2G
厂商: ON Semiconductor
文件页数: 26/29页
文件大小: 0K
描述: IC CTLR CPU 2/3/4 PHASE 32-LQFP
产品变化通告: Product Discontinuation 01/Oct/2008
标准包装: 2,000
应用: 控制器,CPU
输入电压: 9.5 V ~ 13.2 V
输出数: 4
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 32-LQFP
供应商设备封装: 32-LQFP(7x7)
包装: 带卷 (TR)
NCP5314
10. Current Limit Setting
When the output of the current sense amplifier (COx in the
block diagram) exceeds the voltage on the I LIM pin, the part
will latch off. For inductive sensing, the I LIM pin voltage
should be set based on the inductor ’s maximum resistance
(R LMAX ). The design must consider the inductor ’s
resistance increase due to current heating and ambient
temperature rise. Also, depending on the current sense
points, the circuit board may add additional resistance. In
general, the temperature coefficient of copper is +0.39% per
_ C. To set the level of the I LIM pin:
where:
I OUT,LIM is the current limit threshold of the converter;
Δ I Lo /2 is half the inductor ripple current;
R is R LMAX + R PCB;
G ILIM is the current sense to I LIM gain.
For the overcurrent protection to work properly, the
current sense time constant (RC) should be slightly larger
than the R L time constant. If the RC time constant is too fast,
a step load change will cause the sensed current waveform
to appear larger than the actual inductor current and will trip
the current limit at a lower level than expected.
VILIM + (IOUT,LIM ) D ILo 2) @ R @ GILIM
(31)
http://onsemi.com
26
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