HT7937_16 Datasheet, PDF (6/13 Pages) Holtek Semiconductor Inc – Built-in OVP White LED Step-up Converter

Typical Performance Characteristics
3 WLEDs Efficiency vs. LED Current
90
VIN=4V
VIN=5V
85
80
VIN=3V
VIN=3.5V
75
70
65
60
0
L: 10uH, SR0602 10ML (ABC Electronics Corp.)
D1: 1N5819
C1, C2: 1uF
5
10
15
20
LED Current (mA)
3 WLEDs Efficiency vs. LED Current
HT7937
105
103
101
99
97
95
93
3 WLEDs, VIN=3V
L: 10uH, SR0602 10ML(ABC Electronics Corp.)
91
D1: 1N5819
89
C1, C2: 1uF
87
85
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Input Voltage VS Reference Voltage
5 WLEDs Efficiency vs. LED Current
90
VIN=5V
85
80
VIN=4V
75
VIN=3V
VIN=3.5V
70
65
60
0
L: 10uH, SR0602 10ML (ABC Electronics Corp.)
D1: 1N5819
C1, C2: 1uF
5
10
15
20
LED Current (mA)
5 WLEDs Efficiency vs. LED Current
2.0
1.8
3 WLEDs, VIN=3V
L: 10uH, SR0602 10ML(ABC Electronics Corp.)
1.6 _{D1: 1N5819}
C1, C2: 1uF
1.4
1.2
1.0
0.8
-45 -30 -15 0
15 30 45 60 75 90
¢J Temperature ( )
Temperature VS Switching Frequency
105
103
101
99
97
95
93 ^{3 WLEDs, VIN=3V}
L: 10uH, SR0602 10ML(ABC Electronics Corp.)
91 D1: 1N5819
89 ^{C1, C2: 1uF}
87
85
-45 -30 -15
0
15 30 45 60 75 90
¢J Temperature ( )
Temperature VS Reference Voltage
95
94
93
92
91
90
3 WLEDs, VIN=3V
89 _{L: 10uH, SR0602 10ML(ABC Electronics Corp.)}
88 ^{D1: 1N5819}
C1, C2: 1uF
87
86
85
-45 -30 -15
0
15 30 45 60 75 90
¢J Temperature ( )
Temperature VS Switching Duty Cycle
Rev 1.50
6
June 25, 2016