LM5010 datasheet(16/19 Pages) NSC

tên linh kiện	LM5010

Giải thích chi tiết về linh kiện	High Voltage 1A Step Down Switching Regulator

PDF	19 Pages

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nhà sản xuất	NSC [National Semiconductor (TI)]

Trang chủ	http://www.national.com

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16 / 19 page

Applications Information (Continued)

INCREASING THE CURRENT LIMIT THRESHOLD

The current limit threshold is nominally 1.25A, with a mini-

mum guaranteed value of 1.0A. If, at maximum load current,

the lower peak of the inductor current (I

PK- in Figure 13)

exceeds 1.0A, resistor R

CL must be added between SGND

and I

SEN to increase the current limit threshold to equal or

exceed that lower peak current. This resistor diverts some of

the recirculating current from the internal sense resistor so

that a higher current level is needed to switch the internal

current limit comparator. I

PK- is calculated from:

(11)

where I

O(max) is the maximum load current, and IOR(min) is

the minimum ripple current calculated using Equation 10.

CL is calculated from:

20119934

FIGURE 15. Efficiency vs V

Circuit of Figure 14

20119935

FIGURE 16. Efficiency vs Load Current and V

Circuit of Figure 14

20119936

FIGURE 17. Output Voltage Ripple vs V

Circuit of Figure 14

20119937

FIGURE 18. Frequency vs V

Circuit of Figure 14

LM5010 bảng dữ liệu(PDF) 16 Page - National Semiconductor (TI)