FP7175 datasheet(9/14 Pages) FEELING

9 / 14 page

FP7175

This datasheet contains new product information.

Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Website: http://www.feeling-tech.com.tw

Rev. 0.63

9/14

Output Short Circuit Protection

The short circuit protection comparator trips when the voltage at CS exceeds 0.55V. When this

occurs, the GATE off-time THICCUP = 550μs is generated to prevent stair-casing of the inductor current

and potentially its saturation due to insufficient output voltage.

VCS

550mV

RCS

ILED

550us(Typ.)

Linear Dimming

When the voltage at DIM falls below 1.5V, the internal 250mV reference to the constant-current

feedback becomes overridden by VDIM • 0.167. As long as the current in the inductor remains

continuous, the LED current is given by the equation above. However, when VDIM falls below 200mV,

the GATE output becomes disabled. The GATE signal recovers, when VDIM exceeds 250mV. This is

required in some applications to be able to shut the LED lamp off with the same signal input that

controls the brightness.

100%

80%

60%

40%

20%

0.3

0.6

0.9

1.2

1.5

DIM(V)

FP7175 Datasheet(PDF) 9 Page - Feeling Technology Corp.