AAT1239-1_0810 Datasheet, PDF (20/23 Pages) Advanced Analogic Technologies – 40V Step-Up Converter for 4 to 10 White LEDs

SwitchReg^TM
R7 R6 R5
R8
1k 1k 1k
330Ω
S1
Select
D12
S2
Red _Down
S3
Up
PRODUCT DATASHEET
AAT1239-1
40V Step-Up Converter for 4 to 10 White LEDs
VCC
U2
PIC12F675
1 _VDD
VSS ⁸
2 _GP5
GP0 ⁷
3 _GP4
GP1 ⁶
4
GP3
5
GP2
C3
0.1μF
R9
330Ω
D11
Green
S²Cwire
Microcontroller
JP2
JP3
R4
10k
DC- DC+
C
10μF
123
VCC
JP1
C1
4.7μF
U1
AAT1239-1
1 _VIN
2
EN
3 _SEL
4
VP
5 _N/C
6
SW
LIN ¹²
11
OVP
FB ¹⁰
9
GND
PGND ⁸
7
SW
L1
10μH
R1
30.1Ω
DS1
Schottky
R2
374k
R3
12k
D10 D9 D8 D7 D6
WLED WLED WLED WLED WLED
AAT1239-1
White LED
VOUT
Driver
JP4
D1
WLED
D2
WLED
D3
WLED
D4
WLED
D5
WLED
C2
2.2μF
Figure 11: AAT1239-1 Evaluation Board Schematic (with ten LEDs and microcontroller).
20
www.analogictech.com
1239-1.2008.10.1.2