TS19378 Datasheet, PDF (3/7 Pages) Taiwan Semiconductor Company, Ltd – 2A Buck (Step-down) WLED Driver

TS19378
2A Buck (Step-down) WLED Driver
Typical Application Circuit
A: Normal Application Circuit
VIN
C1
220uF
C2
0.1uF
C3
20K
1uF
U1 _AX2005/A
4 _VCC
SW ⁵
3
VGATE
7
FB
2
VSS
8
COMP
1
EN/SS
OVP ⁶
R2
R3
C6
8.2K
0.1uF
100Ω
C7
15n
C_OUT ESR Range
30~80mΩ
80~300mΩ
R2
470R
100R
Dimming
100Hz-50KHz
D2
DIODE
VFB = 0.2V
ILED = VFB/R5
R1
VOVP (OVP) = 0.85× (1+ )
R4
C7
10nF
15nF
L1
33uH
D1
B340 _ILED
LED-1
LED-N
VOUT
R1 C4 C5
470uF ^0.1uF
R5
R4
0.6Ω
B: AC Input Application Circuit 9Inverting)
Bridge rectifier
AC adapter
C1
220uF
C2
0.1uF
C4
100uF
C3
20K
1uF
R3
8.2K
U1 _AX2005/A
4 _VCC
SW ⁵
3
VGATE
FB ⁷
2
VSS
COMP ⁸
1
EN/ SS
OVP ⁶
C6
0.1uF
R4
R2
560Ω
C7
R1 ^33nF
VFB = 0.2V
ILED = VFB/R5
R1
VOVP (OVP) = 0.85× (1+ )
R4
L1
33uH
D1
B340
ILED
LED-1
LED-2
LED-3
C5
0.1uF
LED-4
R5
0.6Ω
VOUT
I_LED
350mA
750mA
1000mA
0.57Ω
0.266Ω
0.2Ω
R5
70mW
150mW
200mW
C1
100uF
220uF
330uF
L1
33uH
3/7
Version: A13