AP3156
HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP
FOR WHITE LED APPLICATIONS
Functional Description
Instruction & Data Table
(Continued)
Disabled Current Sinks
First
Sequence
1~3
4~7
8
Second
Sequence
-
1~32
1
Description
No Action
Reserved
Switching frequency selected to
0.5MHz
Unused current channels must be disabled by connecting the
sinks to V OUT with only a small sense current flowing through
the disabled channel.
Soft-Start
Soft-start is incorporated to prevent excessive inrush current
during power-up, mode switching, and transitioning out of
stand-by mode.
2
3
4~32
Switching frequency selected to
1MHz (default)
Switching frequency selected to
2MHz
Reserved
Short-Circuit Protection
Short-circuit protection function is incorporated to prevent
excessive load current when either flying cap terminals or
output pin electrically tied to a very lower voltage or ground.
Over-Voltage Protection
9
1
2
20mA Constant Current Mode,
32 current level supported
(default)
Low Current Mode, 4 current level
supported
Over-Voltage Protection function is incorporated to limit the
output voltage under a safe value to avoid on-chip device
breakdown.
Under-Voltage Lockout
Under-Voltage lockout feature disables the device when the
input voltage drops below UVLO threshold.
3
4~32
25mA Constant Current Mode,
32 current level supported
Reserved
Thermal Auto Shutdown
When the die temperature exceeds the thermal limit, the
device will be disabled and enter stand-by mode. The
10
11
12
13
14
15
16
17
18
19
20
21
22~32
33
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
1~32 *
-
-
Set current level for all 6
Channels
Set current level for CH1, CH2,
CH3
Set current level for CH4, CH5,
CH6
Set current level for CH1, CH2,
CH3, CH4
Set current level for CH5, CH6
Set current level for CH1, CH2,
CH3, CH4, CH5
Set current level for CH6
Set current level for CH5
Set current level for CH4
Set current level for CH3
Set current level for CH2
Set current level for CH1
Reserved
Soft Reset
operation resumes whenever the die cools off sufficiently.
Switching frequency
By default, the AP3156 is working at 1MHz switching
frequency. It can also work at 0.5MHz or 2MHz switching
frequency which can be set through the Serial Digital Interface.
An user can choose the appropriate switching frequency with
consideration of noise immunity, input and output voltage
ripple requirement, and capacitor selection.
1) 1MHz switching frequency
2) 20mA Constant Current Mode
3) All Channels in Current Level
Setting 32 (0mA)
34
35~63
-
-
Null Sequence
Reserved
* Only 1~5 are valid current settings at Low Current Mode.
AP3156 Rev. 1
10 of 15
www.diodes.com
SEPTEMBER 2009
? Diodes Incorporated
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