ELM915BA 50V输入 1A开关 恒流LED驱动器

ELM915BA is capable of driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. ELM915BA is Buck and Buck-Boost controller with internal switching which can stress 1A peak current stress. The controller operating wide input voltage range from 6V to 50V. ELM915BA consists of an output switch and a high-side output current sensing circuit that uses an external resistor to set the nominal average output current. Through applying an external control signal to the LD/PWM pin, it can adjust the output current to above or below the set value. The LD/PWM pin will accept either a DC voltage or a PWM waveform to provide a continuous or a gated output current. The LD/PWM also provide soft start function to prevent inrush current.
The SOT-26 small package makes ELM915BA suitable for LED MR-16 bulb applications.

Linear or PWM dimming
Soft-start function
Cycle by cycle current limit
Constant off time control
Off time period programmable
Over temperature protection155±30°C
Over voltage protection53V±5%
Internal NMOS switch54V
NMOS with peak current1A
Low quiescent current<250µA
High efficiencyMax.90%
Wide input voltage range6V to 50V
PackageSOT-26
DatasheetELM915BA
应用例
MR16 and general lighting
Automotive lighting
Low voltage Industrial lighting
Battery charging
LED back lighting
Illuminated signs

绝对最大额定值

ParameterSymbolLimitUnit
Input voltageVdd60V
SW output peak currentIsw1A
Other I/O pin voltageVio7V
Junction temperatureTj+150°C
Power dissipationPd450mW
Operating ambient temperatureTop-40 to +85°C
Storage temperatureTstg-55 to +150°C

电路框图

block-diagram