SC443ULTRT Semtech, SC443ULTRT Datasheet - Page 6

• Manufacturer Part Number: SC443ULTRT
• Description: TVS
• Manufacturer: Semtech

Specifications of SC443ULTRT

• Constant Current: *
• Constant Voltage: *
• Topology: *
• Number Of Outputs: *
• Internal Driver: *
• Type - Primary: *
• Type - Secondary: *
• Frequency: *
• Voltage - Supply: *
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 16-UFQFN Exposed Pad
• Operating Temperature: *
• Current - Output / Channel: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SC443ULTRTTR

Switching Frequency Vs. RFSET
Typical Characteristics (continued)
© 2008 Semtech Corp.
0.92
0.88
0.84
0.80
0.76
0.72
0.68
33
32
31
30
29
28
-40
-40
R
VOUT Pull Down Current vs. Temperature
ISET
LED Current Setting vs. Temperature
=4.02k
Switching frequency setting
Switching Frequency (MHz)
Temperature (°C)
IOSET(AVG)
Temperature (°C)
25
25
4.5VIN
800KHz,800KHz ,B1000AS220M(22uH) , SS14, 3X7 150ohm per channel 30mA
Vin=12V, L= 15uH; Cout= 10uF, Load=10*LED(30mA),3string, Ta=25° C,SF=800KHz
21VIN
105
105
90
80
70
60
50
40
30
20
10
0
Vin=12V, L= 15uH, Cout= 10uF, 10*LED,3string, Ta=25°C,
0
VOUT=33V, D1=SS14, L1=B1000AS-220M, Co=10uF
10
PWM Dimming Duty Cycle
Efficiency vs. Input Voltage
20
Switching Frequency=800KHz
30
Duty Cycle(%)
Input Voltage (V)
40
50
60
www.semtech.com
70
80
50Hz
200Hz
SC443
90
50KHz
100
6