Description

The A6210 is a buck regulator that uses valley current-mode

control. This control scheme allows very short switch on-times

to be achieved, making it ideal for applications that require

high switching frequencies combined with high input voltages

and low output LED span voltages.

Low system cost is accomplished through high switching

frequencies of up to 2.0 MHz, allowing smaller and lower value

inductors and capacitors. In addition, few external components

are required through high levels of integration. Optimal drive

circuits minimize switching losses.

The switching frequency is maintained constant, as the on-time

is modulated by the input voltage. This feed-forward control

ensures excellent line correction. The on-time is set by an

external resistor pulled-up to the input supply.

Internal housekeeping and bootstrap supplies are provided

whichrequiretheadditionofonlyonesmallceramiccapacitor.A

top-off charge pump ensures correct operation at light loads.

Internal diagnostics provide comprehensive protection against

input undervoltages and overtemperatures.

The device package is a 16-contact, 4 mm × 4 mm, 0.75 mm

nominal overall height QFN, with exposed pad for enhanced

thermal dissipation. It is lead (Pb) free, with 100% matte tin

leadframe plating.

6210-DS, Rev. 1

Features and Benefits

▪ User-configurable on-time, achieving switching

frequencies up to 2.0 MHz

▪ Brightness control through PWM of DIS pin

▪ Minimal external components required

▪ No output capacitor required

▪ Wide input voltage range: 9 to 46 V

▪ Low 0.18 V sense voltage for higher efficiency

▪ Output Current: up to 3.0 A

▪ Low standby current <100 μA

▪ Thermal shutdown

▪ Supplied in a thermally-enhanced 4 mm QFN package

3 A, 2 MHz Buck-Regulating LED Driver

Applications:

Typical Application

A6210

GND

NC

L

D1

LED1

LED2

LED3

1

68 μH

LX

VIN

ISEN

SGND

A 6210

TON

22 nF

R1

150 kΩ

C1

1.0 μF

390 mΩ

DIS

PWM or Switch

R2

C2

BOOT

24 V

LED span voltage = 10.5 V

Average LED current = 500 mA

Peak to peak current = 60 mA

Switching frequency = 1.4 MHz

Efficiency = 90.5%

Package 16-contact QFN (suffix EU):

▪ High brightness LEDs

▪ LED driver modules, power supplies and lamps, such as

MR16 and MR11

4 mm × 4 mm × 0.75 mm

Suggested Parts

Name

Description

Manufacturer - Part Number

C1

1 μF, 25V, X5R or X7R ceramic, 1210

Taiyo Yuden, TDK

C2

22 nF, 50V, X5R or X7R ceramic, 0805

D1

1 A, 30 V, Schottky diode

L1

68 μH, 1 A inductor

Taiyo Yuden - NR 6045T 680M

R1

180 kΩ, 1%, 0805

R2

390 mΩ, 1%, 0805