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PDF IL7150 Data sheet ( Hoja de datos )
| Número de pieza | IL7150 | |
| Descripción | Light Emitting Diode (LED) Driver | |
| Fabricantes | IK Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IL7150 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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Light Emitting Diode (LED) Driver
Features
Supply voltage from 4.0 to 40 V
Output driving current up to 0.8 A
(IL7150A), 1.5 A (IL7150)
Current consumption 4 mA
ESD protection up to 2kV
Temperature range from - 40 to +85 C
Only 5 external components required
TECHNICAL DATA
IL7150, IL7150A
TO-263-5L
IL7150D2T
IL7150AD2T
Applications
Automotive
DC/DC LED Driver
Lighting Equipments
Light Indicators
Device
IL7150D2T
IL7150AD2T
ORDERING INFORMATION
Operating
Temperature Range
Package
TA = -40 to 125 C
TO-263
TO-263
Packing
Tape & Reel
Tape & Reel
Description
IL7150, IL7150A (functional equivalent AMC7150 of ADDtek) - LED (Light Emitting
Diode) driver with peak output current 0.8A (IL7150A) & 1.5A (IL7150).
Microcircuit designed for driving of power LEDs in the wide range of supply voltages
and load currents with peak output currents 0.8 & 1.5A. Main application areas are
automotive, DC/DC LED driver, lighting equipments and light indicators.
1
2012, June, Rev. 00
1 page  
IL7150
LED driving current
Resistor R1 determine max output peak current to the LED.
Output peak current IO, flowing thought the LED, can be calculated by formula:
IO
330mV
R1
.
Average LED current is determined by amplitude of oscillating (pulsating) current,
that depends on inductivity of coil L1. For example , average current of LED is 550 mA
(pulsating) current is 100 mA. Then:
R1 330mV 0,55 .
550mA 0,5 100mA
In order to driving current not exceed recommended max rating 1.5 A for IL7150,
(0.8A for IL7150A), R1 value has to be more than 200 m.
Inductor
The Inductor L1 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 TON
Ts
VLdt VLdt VLdt 0 ,
0 0 Ton
Where, TS = TON + TOFF
Therefore
Ton
VLED VF
,
Toff VCC VR 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 VD1,
VR is the peak value of the voltage drop across R1 which is 300mV,
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 C1, the switch turn-on time can also be known by Ton D Ts D ,
f
Where duty cycle D Ton
Ton Toff
With knowledge of the peak switch current and switch on time, the value of
inductance can be calculated:
L VCC
VR
VSAT
I PK
VLED
TON
5
2012, June, Rev. 00
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet IL7150.PDF ] | |
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