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LED7706TR Datasheet(PDF) 20 Page - STMicroelectronics

Part # LED7706TR
Description  6-rows 30 mA LEDs driver with boost regulator for LCD panels backlight
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7706TR Datasheet(HTML) 20 Page - STMicroelectronics

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Operation description - boost section
LED7706
20/31
Figure 12.
Main loop and current loop diagram
The SLOPE pin allows to properly set the amount of slope compensation connecting a
simple resistor RSLOPE between the SLOPE pin and the output. The compensation ramp
starts at 35 % (typ.) of each switching period and its slope is given by the following equation:
Equation 12
Where KSLOPE = 5.8 x10
10S-1, V
BE = 2 V (typ.) and SE is the slope ramp in [A/s].
To avoi-d sub-harmonic instability, the compensating slope should be at least half the slope
of the inductor current during the off-phase for a duty-cycle greater than 50 % (i.e. at the
lowest input voltage). The value of
RSLOPE can be calculated according to equation 13.
Equation 13
VIN
0.4V
PWM
Minimum voltage drop
selector
COMP
LX
ROWx
SGND
RILIM
g
m
⎟⎟
⎜⎜
=
SLOPE
BE
IN
OUT
SLOPE
E
R
V
V
V
K
S
)
V
V
(
)
V
V
V
(
L
K
2
R
IN
OUT
BE
IN
OUT
SLOPE
SLOPE


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