The VAS1261A 1 is a continuous mode
inductive step-down converter, designed for
driving single or multiple series connected
LEDs efficiently from a voltage source higher
than the LED voltage. The device operates from
an input supply between 5V and 60V, and
provides an externally adjustable output current
of up to 1.2A.
The VAS1261A is capable with PWM
dimming and drivers the output switch to
achieve high precise PWM dimming especially
when the light is low. It uses an external resistor
to set the nominal average output current.
The device operates over the -40°C to +85°C
temperature range and is available in SOP8-e
package.
Features
Precise PWM dimming
Internal 60V NMOS switch
1.2A output current
High efficiency (up to 97%)
Wide input voltage range: 5V to 60V
Over Temperature protection
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Typical 5% output current accuracy
