参数资料
型号: SC443ULTRT
厂商: Semtech
文件页数: 4/19页
文件大小: 0K
描述: IC LED DRIVR CONST CURRENT 16MLP
标准包装: 1
恒定电流:
拓扑: PWM,升压(升压)
输出数: 3
内部驱动器:
类型 - 主要: 背光
类型 - 次要: 白色 LED
频率: 640kHz ~ 960kHz
电源电压: 4.5 V ~ 21 V
输出电压: 42V
安装类型: 表面贴装
封装/外壳: 16-UFQFN 裸露焊盘
供应商设备封装: 16-MLP(3x3)
包装: 标准包装
工作温度: -40°C ~ 85°C
其它名称: SC443ULTRTDKR
SC443
Electrical Characteristics (continued)
Unless otherwise noted, V IN = 12V, -40°C < T A = T J < 85°C, R IOSET = 4.02kΩ, R FSET = 40.2kΩ.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Compensation
Sourcing Current
Sinking Current
I O-H
I O-L
VCOMP = 0.5V, T J = 25 °C
VCOMP = 2V, T J = 25 °C
7
5
μA
μA
Control Signals
EN, PWM High Voltage
EN, PWM Low Voltage
V EN_H
V EN_L
VIN = 4.5V to 27V
VIN = 4.5V to 27V
2
0.4
V
V
EN, PWM Leakage Current
I EN_LEAK
VEN = VPWM = 0V to 5.0V
0.01
1
μA
PWM Dimming Frequency (1)
PWM Dimming Minimum Duty
Cycle (1)
PWM Dimming Minimum Pulse Width
SS Source Current
SS Sink Current
f PWM
D MIN_PWM
T PWM_MIN
I SS_H
I SS_L
200Hz
200Hz
Vss = 0V
Vss = 2V at OVP or OTP
50
0.4
20
5
1.5
50k
Hz
%
μs
μA
SS Switching Threshold
V SS_TH
T J = 25°C
0.6
0.8
1
V
SS End Voltage
V SS_END
2.6
V
Over-Voltage Protection
OVPIN Threshold Voltage
OVPIN Leakage Current
VOUT Internal Pull-Down in
Over-Voltage Fault
VOUT Leakage Current
V OVPIN_TH
I OVPIN_L
I OVP
I VOUT_L
OVPIN = VIN = 27V
VOUT = 40V
1.45
1.51
0.1
0.8
0.1
1.57
1
V
μA
mA
μA
Current Source (IO1 ~ IO3)
Backlight Current Accuracy
LED Current Matching
IO1~IO3
EN, PWM = 1; T J = 25°C
EN, PWM = 1; T J = 25°C
27.8
29.9
+/-1
32
+/-3
mA
%
Overshoot Protection Threshold
Maximum LED Current
IO1~IO3
I O_MAX
35
0.95
V
mA
IO Off Leakage Current
I O_LEAK
EN = 0V, VIO1 ~ VIO3 = VIN
0.1
1
μA
Over-Temperature Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T OTP
T OTP_H
150
10
°C
°C
Notes:
(1) Guaranteed by design.
? 2009 Semtech Corp.
www.semtech.com
4
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