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AS3492

Datasheet - D e ta i l e d D e s c r i p t i o n

8 Detailed Description

The AS3492 is a high performance DCDC step up converter and five current sources in a small WL-CSP12 package.

The LED configuration is done in up to five strings

in excellent application efficiency even using very small external components (capacitors and coil). The device is con-

trolled by ON13 and ON45. A high levels on these inputs enables the DCDC and the current sources. ON13 and ON45

can be used as PWM inputs

The target application is to use the AS3492 for highly efficient backlight driver (display and/or keypad backlight).

Internal Circuit

Figure 16. AS3492 internal circuit

The AS3492 includes a fixed frequency DCDC step-up with accurate startup control. It is enabled by the input pin

ON13 and ON45 and controls the LED current with five current sources. These input can be used as PWM inputs to

control the brightness in two groups:

- a high level on ON13 enables LED1, LED2 and LED3

- a high level on ON45 enables LED4 and LED5.

1. Unused strings shall be connected to VOUT or GND.

2. Single LED strings can be mixed with dual LED strings as long as each of the two groups (LED1...LED3,

LED4...LED5) has at least one string with two LEDs in series - it will reduce application efficiency.

3. Using the PWM inputs, the AS3492 supports DLS, dynamic luminance scaling, also called CABC, content

adaptive backlight control or DBC, dynamic backlight control.

 















 

  







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AS3492