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A6280, A6281, A6281EESTR

Table of contents:
Info of A6280
Info of A6281
Info of A6281EESTR

A6280, A6281, A6281EESTR Selling Leads, Datasheet

MFG:MMI Package Cooled:QFN D/C:07+

A6280, A6281, A6281EESTR Datasheet download

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Part Number: A6280

MFG: MMI

Package Cooled: QFN

D/C: 07+

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A6280 General Description

The A6280 is a 3 bit constant current LED driver that has a wide range of output currents. The A6280 controls LED luminance with a pulse width modulation (PWM) scheme that gives the application the capability of displaying a billion colors. The overall maximum current is set by an external resistor.

The LED luminance is controlled by performing PWM control on the outputs. The luminance data of the PWM signal for each LED is stored in three 10 bit registers. Each LED can be dot corrected by a 7 bit scalar register that scales the maximum current from 100% down to 36.5%. All the internal latched registers are loaded by a 31 bit serial shift register. One bit is used to control the type of data loaded into the registers, either dot correction / clock divider ratio or luminance data. The remaining 30 bits are used for the data. This helps reduce the pin count of the A6280. To further lower the A6280 pin count, the PWM clock and the serial bus clock share the same pin and work concurrently to control LED luminance and to load data.

The A6280 is designed to minimize the number of components needed to drive LEDs with large pixel spacing. Several A6280s can be daisy chained together and controlled by just four control signals (Clock, Serial Data, Latch, and Output Enable). Each of these inputs has buffered outputs on chip. Also, the VIN pin can be tied to the LED voltage supply bus, thus eliminating the need for a separate chip supply bus or an external linear regulator. The A6280 is supplied in a 16 pin dual in line (DIP) package (suffix 'A') package and in a 16 lead QFN/MLP (suffix 'ES') package.

The packages are lead (Pb) free with 100% matte-tin leadframe plating.

A6280 Maximum Ratings

Characteristic	Symbol	Notes	Rating	Units
Supply Voltage	V_IN		17	V
Output Voltage	V_O		0.5 to 17	V
Output Current	I_O		170	mA
Ground Current	I_GND		600	mA
Logic Input Voltage Range	V_I		0.3 to 7	V
Operating Ambient Temperature	T_A	Range E	40 to 85	°C
Maximum Junction Temperature	T_J(max)		150	°C
Storage Temperature	T_stg		40 to 150	°C

A6280 Features

▪ 5 to 17 V operation
▪ Wide output current range (10 to 150 mA per output)
▪ 3 × 7 bit Dot Correction current settings
▪ 31 bit shift register
▪ 3 ×10 bit PWM luminance settings
▪ Buffered output control pins
▪ Up to 5 MHz serial / PWM clock frequency
▪ Thermal Shutdown / UVLO

A6281 General Description

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.

The A6281 is supplied in a 3 mm 3 mm 16-terminal QFN (suffix S? package, with 0.75 mm nominal overall height. The package is lead (Pb) free with 100% matte-tin leadframe plating.

A6281 Maximum Ratings

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 serially-connected 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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