ap1521wa Diodes, Inc., ap1521wa Datasheet - Page 6

• Manufacturer Part Number: ap1521wa
• Description: White Led Step-up Converter
• Manufacturer: Diodes, Inc.

White LED Step-Up Converter
Anachip Corp.
www.anachip.com.tw
3V To 5V
3V To 5V
3V To 5V
V
V
V
Typical Performance Characteristics
IN
IN
IN
1uF
1uF
C
C
1uF
C
C
C
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
C
C
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
C
C
D: CENTRAL CMDSH2-3
L: MURATA LQH3C220
Not Recommended for New Design
IN
IN
IN
OUT
IN
OUT
IN
IN
OUT
: TAIYO YUDEN JMK107BJ105
: TAIYO YUDEN JMK107BJ105
: TAIYO YUDEN JMK107BJ105
: AVX 0603YD224
: AVX 0603YD224
: AVX 0603ZD105
Li-lon to Three White LEDs
Li-lon to Four White LEDs
Li-lon to Two White LEDs
SHDN
SHDN
SHDN
V
V
V
IN
IN
IN
AP1521
AP1521
22uH
22uH
AP1521
GND
22uH
GND
GND
L
L
L
SW
SW
SW
FB
FB
FB
Dimming
Dimming
Dimming
D
D
V
V
D
V
DC
DC
DC
90k
90k
90k
5k
5k
5k
4Ω
4Ω
R1
R1
R1
4Ω
6/8
0.22uF
0.22uF
C
1uF
C
C
OUT
OUT
OUT
85
83
81
79
77
75
73
71
69
67
85
83
81
79
77
75
73
71
69
67
85
83
81
79
77
75
73
71
69
67
AP1521 Efficiency(%) v.s. LED
0
AP1521 Efficiency(%) v.s. LED
AP1521 Efficiency(%) v.s. LED
0
0
Vin=5V
Vin=4.2V
Vin=5V
Vin=4.2V
10
Vin=5V
10
10
LED Current (mA)
Current (mA)
LED Current (mA)
Current (mA)
Current (mA)
LED Current (mA)
20
20
20
Vin=3.6V
Vin=3.6V
30
Rev. 0.1 Apr. 27, 2004
30
AP1521
30
40
Vin=3.6V
40
40
50
Vin=4.2V
60
50
50