General Description
AP1513 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
AP1513 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300KHz to 30KHz. Also, an internal compensation block is built in to minimum external component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP–8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter.

*Input voltage: 3.6V to 18V.
*Output voltage: 0.8V to VCC.
*Duty ratio: 0% to 100% PWM control
*Oscillation frequency: 300KHz typ.
*Soft-start, Current limit, Enable function
*Thermal Shutdown function
*Built-in internal SW P-channel MOS
*SOP-8L Pb-Free Package.

*PC Motherboard
*LCD Monitor
*Graphic Card
*DVD-Video Player
*Telecom Equipment
*ADSL Modem
*Printer and other Peripheral Equipment
*Microprocessor core supply
*Networking power supply

AP1513S, AP1513SA

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The A6281 is a 3-channel constant current LED driver that has a wide range of output currents. The A6281 controls LED brightness with a Pulse Width Modulation (PWM) scheme that gives the application the capability of displaying a billion colors in an RGB cluster. The maximum current is set by an external resistor.
The LED brightness is controlled by performing PWM control on the outputs. The brightness data of the PWM signal for each LED is stored in three 10-bit registers. The peak value for each LED can be adjusted (dot-corrected) to compensate for mismatch, aging, and temperature effects. All the internal latched registers are loaded by a 32-bit shift register. One address bit controls whether dot correction/clock divider ratio or brightness data is loaded into the registers. The remaining bits are used for the data.
The A6281 is designed to minimize the number of components needed to drive LEDs with large pixel spacing. A large number of A6281s can be daisy chained together and controlled by just four control signals (clock, serial data, latch, and output enable). Each of these inputs is buffered to drive the next chip in the chain. Also, VIN can be tied to the LED voltage supply bus, thus eliminating the need for a separate chip supply bus or an external regulator.

Features and Benefits
*3 × 10-bit PWM brightness settings
*3 × 7-bit dot correction current settings
*5 to 17 V operation
*Wide output current range, 10 to 150 mA per channel
*Internally generated PWM clock
*Serial port operates at up to 5 MHz
*Data and clock logic architecture allows single microcontroller control of large quantities of seriallyconnected A6281s at fast data transfer rate
*Buffered logic outputs to drive cables
*Thermal shutdown and UVLO protection
*Power-On Reset

*Colored, large-character LED signs
*Scrolling, colored marquees
*Architectural lighting
*High intensity monochrome displays
*Large video and graphic displays


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