Diodes AP3156 Manuel d'utilisateur télécharger pdf (Page 10)

AP3156

HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP

FOR WHITE LED APPLICATIONS

AP3156 Rev. 1 10 of 15 SEPTEMBER 2009

www.diodes.com © Diodes Incorporated

Instruction & Data Table

First

Sequence

Second

Sequence

Description

1~3

- No Action

4~7

1~32 Reserved

4~32

Switching frequency selected to

0.5MHz

Switching frequency selected to

1MHz (default)

Switching frequency selected to

2MHz

Reserved

4~32

20mA Constant Current Mode,

32 current level supported

(default)

Low Current Mode, 4 current level

supported

25mA Constant Current Mode,

32 current level supported

Reserved

1~32

Set current level for all 6

Channels

1~32

Set current level for CH1, CH2,

CH3

1~32

Set current level for CH4, CH5,

CH6

1~32

Set current level for CH1, CH2,

CH3, CH4

1~32

Set current level for CH5, CH6

1~32

Set current level for CH1, CH2,

CH3, CH4, CH5

1~32

Set current level for CH6

17 1~32* Set current level for CH5

1~32

Set current level for CH4

1~32

Set current level for CH3

1~32

Set current level for CH2

1~32

Set current level for CH1

22~32

Reserved

Soft Reset

1) 1MHz switching frequency

2) 20mA Constant Current Mode

3) All Channels in Current Level

Setting 32 (0mA)

Null Sequence

35~63

Reserved

* Only 1~5 are valid current settings at Low Current Mode.

Disabled Current Sinks

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.

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

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.

Thermal Auto Shutdown

When the die temperature exceeds the thermal limit, the

device will be disabled and enter stand-by mode. The

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.

Functional Description (Continued)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15

Commentaires sur ces manuels

Pas de commentaire

Diodes AP3156 Manuel d'utilisateur Page 10

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Diodes AP3156