ap1521wa Diodes, Inc., ap1521wa Datasheet - Page 3

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

White LED Step-Up Converter
Anachip Corp.
www.anachip.com.tw
Symbol
V
V
Duty
I
V
F
V
SHDN
V
V
I
I
SHDN
SHDN
SW
FB
SAT
SW
FB
Electrical Characteristics
IN
IN
Typical Application Circuit
Minimum Operation Voltage
Maximum Operation Voltage
Feedback Pin Voltage
Feedback Pin Bias Current
Supply Current
Switching frequency
PWM Maximum Duty Cycle
Switch Current Limit
Switch V
Switch Leakage Current
SHDN Pin Voltage High
SHDN Pin Voltage Low
SHDN Pin Bias Current
Not Recommended for New Design
0.22uF
C2
SAT
Parameter
15mA
C1, C2: X5R or X7R Dielectric
D1: Central Semiconductor CMDSH-3
L1: MURATA LQH3C-220 or Equivalent
LED1
LED2
LED3
20ohm
R1
(T
a
D1
=25
-
-
-
-
V
I
V
Enable
Disable
SW
SHDN
SW
Figure 1.
= 250mA
°C
= 5V
, V
= 0V
3/8
IN
Conditions
= 3V, V
SW
Vss
FB
22uH
L1
SHDN
SHDN
Vin
= 3V, unless otherwise noted.)
Min.
0.75
280
2.5
1.5
10
85
--
--
--
--
--
--
--
--
ON OFF
1uF
Typ.
0.01
C1
310
320
350
1.9
0.1
1.0
45
90
65
--
--
--
--
Rev. 0.1 Apr. 27, 2004
AP1521
Max.
1.25
340
100
2.5
1.0
0.4
10
--
--
--
--
--
--
5
MHz
Unit
mV
mA
mA
mV
nA
µA
µA
µA
%
V
V
V
V