EVALED7706 STMicroelectronics, EVALED7706 Datasheet - Page 17

• Manufacturer Part Number: EVALED7706
• Description: EVALUATION BOARD FOR LED7706
• Manufacturer: STMicroelectronics

Specifications of EVALED7706

• Current - Output / Channel: 30mA
• Outputs And Type: 6, Non-Isolated
• Voltage - Output: 36 V
• Features: Dimmable, Extra 5V Output
• Voltage - Input: 4.5 ~ 36 V
• Utilized Ic / Part: LED7706
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6445

LED7706
The SLOPE pin allows to properly set the amount of slope compensation connecting a
simple resistor R
starts at 35% (typ.) of each switching period and its slope is given by the following equation:
Equation 6
Where KS = 5.8
To avoid sub-harmonic instability, the compensating slope should be at least half the slope
of the inductor current during the off-phase when the duty-cycle is greater than 50%. The
value of R
Equation 7
Figure 12. Effect of slope compensation on small inductor current perturbation
SLOPE
Inductor current (CCM)
Inductor current (CCM)
(D > 0.5)
0.35
0.35
⋅
can be calculated according to equation 7.
SLOPE
10
·T
·T
ΔI
ΔI
SW
SW
10
L
L
s
between the SLOPE pin and the output. The compensation ramp
T
T
-1
Inductor current
Inductor current
perturbation
perturbation
SW
SW
, V
R
BE
SLOPE
= 2 V (typ.) and S
S
E
≤
=
slope compensation (S
slope compensation (S
Programmed inductor peak current with
Programmed inductor peak current with
2
K
⋅
S
K
⎛
⎜
⎜
⎝
S
V
⋅
OUT
L
V (
I
I
⋅
BOOST, PEAK
BOOST, PEAK
R
V (
OUT
−
SLOPE
OUT
E
V
IN
is the slope ramp in [A/s].
−
−
−
V
E
E
)
)
IN
V
V
BE
IN
)
−
⎞
⎟
⎟
⎠
V
BE
)
Operation description
t
t
AM00606v1
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