SGM3141B 데이터 시트보기 (PDF) - Shengbang Microelectronics Co, Ltd
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SGM3141B Datasheet PDF : 14 Pages
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SGM3141B
700mA Buck/Boost
Charge Pump LED Driver
TYPICAL APPLICATION
The SGM3141B can be used with multiple LEDs in parallel as shown in Figure 1. For best performance, the LEDs
should be in a single package, preferably from a single die to have better matching for forward voltage VF for a given
forward current IF. In practice, if the VF of one LED is higher than the others, it will consume a larger IF, which will raise its
temperature which will then cause its VF to decrease, correcting the imbalance. The overall current will be the sum of the
individual currents, for example ITOTAL = 4 × ILED.
VIN
3.0V to 4.2V
1
2
3
Jumper
CIN
10μF
CF
1μF
SW2
REN
10kΩ
1 VIN
VOUT 10
2 C1
9
PGND
SGM3141B
3
C2
8
SGND
4
FLASH
7
FB
COUT
4.7μF
5 EN
6
RSET
RSET
139kΩ
RFB
0.33Ω
Figure 1. Multiple LED Flash Circuit
The SGM3141B also can be used to drive two flash LEDs in portable equipments. The schematic is shown in Figure 2.
VIN
3.0V to 4.2V
C1
4.7μF
C3
1μF
FLASH
ENABLE
1 VIN
VOUT 10
2 C1
9
PGND
C2
10μF
SGM3141B
3
C2
8
SGND
4
FLASH
7
FB
5 EN
6
RSET
R3
120kΩ
Figure 2. Two Flash LED Drive
D1
500mA LED
R4
R5
10kΩ
10kΩ
D2
500mA LED
R1
0.22Ω
R2
0.22Ω
SG Micro Corp
7
www.sg-micro.com
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