sc441c Semtech Corporation, sc441c Datasheet - Page 6

• Manufacturer Part Number: sc441c
• Description: High Efficiency Integrated Driver For 4-strings Of 150ma Leds
• Manufacturer: Semtech Corporation

2mA
Typical Characteristics (continued)
© 2010 Semtech Corporation
250
230
210
190
170
150
130
110
900
800
700
600
500
400
300
200
100
Condition: VIN = 12V, VOUT = 30V / 150mA x 4 strings
0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
LED Current Source Saturation Voltage
-40
10
0.5
PWM Dimming Minimum Pulse Width
I
FFLAG Saturation Voltage(V)
FFLAG
T
PWM Dimming Frequency (kHz)
A
20
FFLAG Saturation Voltage
1
= 25
vs. PWM Dimming Frequency
132.2
= 2mA
-40
40
LED Current (mA)
vs. Temperature
2
vs. LED Current
o
C
Temperature (
60
5
164.4
25
80
25
10
100
20
o
C)
233.2
120
105
30
140
40
160
105
50
75
70
65
60
55
50
45
94
92
90
88
86
84
82
80
22
20
18
16
14
12
10
8
6
4
2
0
-40
80
0.2
I
OVPRTN
Condition: VIN = 12V, VOUT = 30V / 20mA x 4 strings
PWM Dimming Minimum Duty Cycle
0.5
OVPRTN Saturation Voltage
Efficiency ( P
160
Boost Section Output Current (mA)
vs. PWM Dimming Frequency
= 100uA
PWM Dimming Frequency (kHz)
1
VIN = 5V
Condition: VOUT = 36V
vs. Temperature
240
Temperature (
2
320
BOOST_OUTPUT
5
25
400
10
VIN = 21V
VIN = 12V
o
C)
20
480
/ P
INPUT
30
560
)
40
105
600
50
1.534
1.530
1.526
1.522
1.518
1.514
Condition: VIN = 12V, VOUT = 30V / 20mA x 4 strings
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
Condition: VIN = 12V, VOUT = 30V / 150mA x 4 strings
14
12
10
8
6
4
2
0
-40
PWM Dimming Minimum Duty Cycle
0.5
0.2
VIN = 12V
PWM Dimming Minimum Pulse Width
vs. PWM Dimming Frequency
0.5
PWM Dimming Frequency (kHz)
1
vs. PWM Dimming Frequency
OVPIN Threshold Voltage
PWM Dimming Frequency (kHz)
1
2
vs. Temperature
Temperature (
2
5
5
25
10
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10
20
SC441C
20
o
C)
30
30
40
40
105
50
50
6