ELM915BA
54V 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 54V. 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
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Linear or PWM dimming
Soft-start function
Cycle by cycle current limit
Constant off time control
Off time period programmable
Thermal shutdown protection
Internal NMOS switch
High efficiency
Wide input voltage range
Package
■Application
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: 54V, 1A
: Max.90%
: 6V to 54V
: SOT-26
MR16 and general lighting
Automotive lighting
Low voltage Industrial lighting
Battery charging
LED back lighting
Illuminated signs
■Maximum absolute ratings
Parameter
Power supply voltage
SW output peak current
I/O pin voltage
Power dissipation
Operating ambient temperature
Storage temperature
Symbol
Vdd
Isw
Vio
Pd
Top
Tstg
Limit
60
1
GND-0.3 to Vdd+0.3
450
-40 to +125
-55 to +150
Unit
V
A
V
mW
°C
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
Symbol
a
b
c
ELM915BA-S
Package
Product version
Taping direction
B: SOT-26
A
S: Refer to PKG file
ELM915BA - S
↑↑ ↑
ab c
* Taping direction is one way.
6-1
Rev.1.1