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7447714470 Scheda tecnica(PDF) 11 Page - Union Semiconductor, Inc.

Il numero della parte 7447714470
Spiegazioni elettronici  Hysteretic Buck High Brightness LED Driver with Internal Switch
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Produttore elettronici  UNIONSEMI [Union Semiconductor, Inc.]
Homepage  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

7447714470 Scheda tecnica(HTML) 11 Page - Union Semiconductor, Inc.

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________________________________________________________________________
http://www.union-ic.com Rev.05 Apr.2016
11/13
UM1360
Load Current
Inductor
Saturation Current
IOUT>1A
27-47μH
1.3-1.5 Times of Load Current
0.8A<IOUT≤1A
33-82μH
0.4A<IOUT≤0.8A
47-100μH
IOUT≤0.4A
68-220μH
Order
Code
L(μH)
Size
DCR
(mΩ)
Saturation
Current (mA)
Manufacturer
744066330
33
1038
92
1800
Würth Elektronik
www.we-online.com
7447714470
47
1050
82.5
2.5
7447714680
68
1050
110
2200
7447714101
100
1050
165
1800
The inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off'
times within the specified limits over the supply voltage and load current range. The following
equations can be used as a guide.
LX Switch 'On' time
TON=(L1*ΔI)/(VIN-VLED-ILED*(RS+RL+RLX))
LX Switch 'Off' time
TOFF=(L1*ΔI)/(VLED+VD+ILED*(RS+RL))
Where:
L1 is the coil inductance (H).
RL is the coil resistance (Ω).
RS is the current sense resistance (Ω).
ILED is the required LED current (A).
ΔI is the coil peak-peak ripple current (A) {internally set to 0.3×I
LED}.
VIN is the supply voltage (V).
VLED is the total LED forward voltage (V).
RLX is the switch resistance (Ω) {=0.5Ω nominal}.
VD is the diode forward voltage at the required load current (V).
Diode Selection
For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance
Schottky diode with low reverse leakage at the maximum operating voltage and temperature.
They also provide better efficiency than silicon diodes, due to a combination of lower forward
voltage and reduced recovery time.
It is important to select parts with a peak current rating above the peak coil current and a
continuous current rating higher than the maximum output load current. It is very important to
consider the reverse leakage of the diode when operating above 85°C. Excess leakage will
increase the power dissipation in the device and if close to the load may create a thermal
runaway condition.
The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will
increase the peak voltage on the LX output. If a silicon diode is used, care should be taken to
ensure that the total voltage appearing on the LX pin including supply ripple, does not exceed
the specified maximum value.
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching losses and stable operation. Minimize
ground noise by connecting high current ground returns, the input bypass capacitor ground lead,
and the output filter ground lead to a single point. Place Rs as close as possible to the ISENSE and
VIN. For better noise immunity, a Kelvin connection is strongly recommended between ISENSE
and Rs.


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