ELM915BA Datasheet, PDF (1/6 Pages) ELM Technology Corporation – 54V 1A switching LED driver

ELM915BA 50V 1A switching LED driver
■General description
ELM915BA is constant current LED driver with fixed off time, which consists of internal switching that
can drive 1A peak current and capable of driving single or multiple LEDs in series connection efficiently.
ELM915BA consists of switch NMOS transistor (Max.1A current) can operate from 6V to 50V. The low-side
current detection circuit which is able to set the average current of output by output NMOS switch and external
resistors is also included in ELM915BA. ELM915BA can be used as buck type and buck-boost type as well.
Through input of external control signal to LD/PWM pin, ELM915BA is capable of adjusting the value of
output current. The LD/PWM is able to control the continuous output current which is from DC level input and
the digital one which is from PWM input. The LD/PWM is also equipped with 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
• Thermal shutdown protection
• Over voltage protection
• Internal NMOS switch
• High efficiency
• Wide input voltage range
• Package
: 155±30°C
: 53V±5%
: 54V, 1A
: 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
Power supply voltage
Vdd
50
V
SW output peak current
Isw
1
A
I/O pin voltage
Vio
GND-0.3 to Vdd+0.3
V
Power dissipation
Pd
450
mW
Operating ambient temperature
Top
-40 to +125
°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
6 -1
Rev.1.2