SC4538 データシートの表示（PDF） - Semtech Corporation
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SC4538 Datasheet PDF : 14 Pages
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SC4538
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ Max Units
Boost Converter Characteristics (continued)
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
V = 5.5V
L(LX)
LX
0.01
1
μA
V
I = 0.3A
SAT
LX
250 450
mV
I
COMP
VCOMP = 0.9V, TA = 25ºC
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 = 5.5V
EN
OUT
IN
50
70
μA
0.01
1
μA
f
Applied to EN pin
100
50k
Hz
EN
D
200Hz on EN pin
0
100
%
EN
BL Current Setting Range(3)
BL Current Setting Accuracy
1
30
mA
I
BL
T = 25°C
A
-3.5
3.5
%
BL Leakage Current
I
V = 0V, V = 2V
L(BL)
EN
BL
0.01 0.1
μA
BL Current Line Regulation
ΔI /ΔV
BL IN
V = 3.0 to 5.5V
IN
±0.05
mA/V
BL Voltage
VBL
0.35
V
ISET Bias Voltage
V
ISET
0.5
V
ISET-to-I Gain
BL
Start-Up Time
A
ISET
t
start-up
230
A/A
1.3
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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