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PDF BM0150 Data sheet ( Hoja de datos )

Número de pieza BM0150
Descripción 1.5A POWER LED DRIVER
Fabricantes Bookly 
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No Preview Available ! BM0150 Hoja de datos, Descripción, Manual

BM0150
1.5A POWER LED DRIVER
DESCRIPTION
FEATURES
BM0150 is a PWM power LED driver IC. The
driving current from few milliamps up to 1.5A. It allows
high brightness power LED operating at high efficiency
from 3.6Vdc to 40Vdc. Up to 200KHz external controlled
operation frequency. External resistor controlled the
maximum output current to single LED or a LED string.
„ Only 5 external components required.
„ Output driving current up to 1.5A.
„ 3.6V~40V wide operation voltage range.
„ High efficiency
„ ESD protection HBM 3KV
„ TO-252 5-pin power package.
APPLICATIONS
„ DC/DC LED driver
„ Automotive
„ Lighting
TYPICAL APPLICATION
PACKAGE PIN OUT
5 OSC
4 OUT
3 GND
2 CS
1 VCC
TO-252-5L (Top View)
3.6V~40V
Rsense
CIN
CT
VCC
CS OUT
OSC BM0150
GND
DF
L
ORDER INFORMATION
TR TO-252
5-pin
BM0150-T (80pcs/ tube , tube)
BM0150-R (2500pcs/ reel , tape & reel)
Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter “” to part number (i.e. AMC7150DLT).
2. The letter ”F” is marked for Lead Free process.
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BM0150 pdf
BM0150
Inductor
The Inductor L stores energy during switch turn-on period and discharge driving current to LEDs via flywheel
diode while switch turn-off. In order to reduce the current ripple on LEDs, the L value should high enough to keep the
system working at continuous-conduction mode that inductor current won’t fall to zero.
Since in steady-state operation the waveform must repeat from one time period to the next, the integral of the
inductor voltage vL over one time period must be zero:
∫ ∫ ∫Ts
0
v L dt
=
tON
0
vL
dt
+
Ts
tON
vL dt
=
0
Where Ts = tON + tOFF
Therefore
tON =
VLED + VF
tOFF VCC VRsense VSAT VLED
Where, VLED is the total forward voltage (at expecting current) of the LED string, VF is the forward voltage of the
flywheel diode DF, VRsense is the peak value of the voltage drop across Rsense which is 300mV, and VSAT is the saturation
voltage of the switch which has a typical value of 1V.
Since the operation frequency f is determined by choosing appropriate value for timing capacitor CT, the switch
turn-on time can also be known by
tON
=
D Ts
=
D
f
Where D(Dutycycle) = tON
tON + tOFF
With knowledge of the peak switch current and switch on time, the value of inductance can be calculated.
L
= VCC
VRsense VSAT
I PK
VLED
tON
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