Operation description - boost section

LED7706

22/31

Equation 15 a

Equation 15 b

6.8

Thermal protection

In order to avoid damage due to high junction temperature, a thermal shutdown protection is

implemented. When the junction temperature rises above 150 °C (typ.), the device turns off

both the control logic and the boost converter and holds the FAULT pin low. The LDO is kept

alive and normal operation is automatically resumed after the junction temperature has

been reduced by 30 °C.

3

D

L

F

D

V

I

SW

IN

rms

,

MOS

⋅

⋅

=

()

()

()

⎟

⎟

⎠

⎞

⎜

⎜

⎝

⎛

−

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⋅

⋅

+

−

=

3

2

SW

OUT

OUT

2

OUT

rms

,

MOS

D

1

D

L

f

I

V

12

1

D

1

D

I

I