5
HV9910BDB3
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
Constant Off-Time Mode:
The HV9910BDB3 is designed to be operated in the constant off-time mode when the load is two LEDs in series. In this
mode, the line regulation of the LED current is less than 2% and the efficiency greater than 80%.
Fig. 5. Efficiency vs. Input Voltage Plot
Efficiency vs. Input Voltage
(@V
O
= 7.8V)
90
91
92
93
94
95
8
12
16
20
24
28
32
Input Voltage (V)
Efficiency (%
)
Fig. 6. Line Regulation of LED Current Plot
Line Regulation (@ V
O
= 7.8V)
-2
-1
0
1
2
8
12
16
20
24
28
32
Input Voltage (V)
Change in current (%
)
Efficiency vs. Load Voltage
(@V
IN
= 12V)
75
80
85
90
95
2
4
6
8
Load Voltage (V)
Efficiency (%
)
Fig. 7. Efficiency vs. Load Voltage Plot
Fig. 8. Load Regulation of LED Current Plot
Load Regulation (@ V
IN
= 12V)
0
2
4
6
8
10
2
4
6
8
Load Voltage (V)
Change in current (%
)