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A6210 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A6210 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 11 page 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 VIN 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 |
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