ELM915BA_17 Datasheet, PDF (1/5 Pages) ELM Technology Corporation – 50V 1A switching LED driver

ELM915BA 50V 1A switching LED driver
http://www.elm-tech.com
■General description
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.
■Features
• Linear or PWM dimming
• Soft-start function
• Cycle by cycle current limit
• Constant off time control
• Off time period programmable
• Over temperature protection
• Over voltage protection
• Internal NMOS switch
• NMOS with peak current
• Low quiescent current
• High efficiency
• Wide input voltage range
• Package
: 155±30°C
: 53V±5%
: 54V
: 1A
: <250μA
: Max.90%
: 6V to 50V
: SOT-26
■Application
• MR16 and general lighting
• Automotive lighting
• Low voltage Industrial lighting
• Battery charging
• LED back lighting
• Illuminated signs
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
Input voltage
Vdd
60
V
SW output peak current
Isw
1
A
Other I/O pin voltage
Vio
7
V
Junction temperature
Tj
+150
°C
Power dissipation
Pd
450
mW
Operating ambient temperature
Top
-40 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
ELM915BA-S
Symbol
a
Package
b
Product version
c
Taping direction
* ^{Taping direction is one way.}
B: SOT-26
A
S: Refer to PKG file
ELM915BA - S
↑↑ ↑
ab c
Rev.1.4
5-1