SIP12506DMP-TI-E3 VISHAY [Vishay Siliconix], SIP12506DMP-TI-E3 Datasheet - Page 10

• Manufacturer Part Number: SIP12506DMP-TI-E3
• Description: 1-MHz Boost Converter with OVP for White LED Applications
• Manufacturer: VISHAY [Vishay Siliconix]

SiP12506
Vishay Siliconix
OPEN-CIRCUIT PROTECTION:
In the event of an output open circuit (e.g. when the LEDs are
either disconnected form the output or an LED fails), the
feedback voltage will become zero causing the SiP12506 to
go to maximum duty cycle. This would generally result in a
high output voltage and, possibly, cause the voltage on the
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech-
nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability
data, see
www.vishay.com
10
http://www.vishay.com/ppg?73861.
Figure 12. White LED driver with a fixed output and adjustable brightness control using a filtered PWM signal
V
IN
V
4.7 µF
IN
4.7 µF
SHD
SHD
Figure 11. White LED driver with adjustable brightness control using a filtered PWM signal
3
5
3
5
V
SHD
OUT
V
SHD
SiP12506
OUT
SiP12506
GND
2
GND
V
2
IN
V
6
IN
6
LX
FB
10 µH
LX
FB
10 µH
0.208 V
1
4
0.208 V
1
4
MBR0530
MBR0530
100 KΩ
20 KΩ
PWM > 22 KHz
R
R3
C
1 µF
DC
R2
OUT
C
1 µF
OUT
R1
> 22 KHz
PWM
10 KΩ
LX pin to exceed it's absolute maximum rating and damage
the part. However, the SiP12506 has a built-in over-voltage
protection circuitry that will clamp the output to 20 V and guar-
antee safe operation under open-circuit conditions.
R2
C
0.1 µF
DC
R3
R1
15 Ω
R4
R4
R5
R5
R6
S-70547–Rev. D, 26-Mar-07
R6
Document Number: 73861
V
V
OUT
OUT