SC4540EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4540EVB' PDF : 15 Pages View PDF
SC4540
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ Max Units
Boost Converter Characteristics (continued)
Switch Over-Current Protection
Switch Leakage Current
Switch Saturation Voltage
COMP Sourcing Current
COMP Sinking Current
OUT Over-Voltage Protection
OUT Internal Pull-Down Current
OUT Bias Current
OUT Leakage Current
PWM Dimming Frequency Range(1)(2)
PWM Dimming Duty Cycle Range(1)(2)
Current Sink Characteristics
I
425
725 mA
OCP
I
V = 12V
L(LX)
LX
0.01
1
μA
V
I = 0.3A
SAT
LX
250 450
mV
ICOMP
V = 0.9V, T = 25ºC
COMP
A
V = 0.9V, T = 25ºC
COMP
A
5
μA
6
V
38
43
V
OVP
I
During OVP condition
OVP
1
mA
V = V , V = 20V
EN
IN OUT
I
OUT
V = 0V, V = V = 12V
EN
OUT
IN
50
70
μA
0.01
1
μA
fEN
Applied to EN pin
100
50k
Hz
DEN
200Hz on EN pin
0
100
%
BL Current Setting Range(3)
BL Current Setting Accuracy
BL Leakage Current
BL Current Line Regulation
BL Voltage
ISET Bias Voltage
ISET-to-I Gain
BL
Start-Up Time
I
BL
I
L(BL)
ΔI /ΔV
BL IN
V
BL
V
ISET
A
ISET
t
start-up
T = 25°C
A
V = 0V, V = 2V
EN
BL
V = 3.0 to 5.5V
IN
1
30
mA
-3.5
3.5
%
0.01 0.1
μA
±0.05
mA/V
0.35
V
0.5
V
230
A/A
1
μs
Notes:
(1) Guaranteed by design.
(2) See PWM Dimming description in the Applications Information section for limitations at high PWM dimming frequencies and low PWM
dimming duty cycles.
(3) Not recommended to program below 1mA with R due to tolerance stackup. To produce output current less than 1mA, set the current >
ISET
1mA and use PWM dimming.
4
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