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7447714680 Scheda tecnica(PDF) 9 Page - Union Semiconductor, Inc.

Il numero della parte 7447714680
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.

7447714680 Scheda tecnica(HTML) 9 Page - Union Semiconductor, Inc.

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________________________________________________________________________
http://www.union-ic.com Rev.05 Apr.2016
9/13
UM1360
Applications Information
Setting Nominal Average Output Current with External Resistor RS
The nominal average output current in the LED(s) is determined by the value of the external
current sense resistor (RS) connected between VIN and ISENSE and is given by:
IOUTnom=0.1/RS [for RS≥0.1Ω]
The table below gives values of nominal average output current for several preferred values of
current setting resistor (Rs) in the typical application circuit as shown on page 5.
Rs (Ω)
Nominal Average Output Current (mA)
0.1
1000
0.13
760
0.15
667
0.3
333
The above values assume that the VSET pin is floating or applied with a voltage higher than
2.5V (must be less than 5V). Note that Rs=0.1Ω is the minimum allowed value of sense
resistor under these conditions to maintain switch current below the specified maximum value.
It is possible to use different values of Rs if the VSET pin is driven from an external voltage.
(See next section).
Output Current Adjustment by External DC Control Voltage
The VSET pin can be driven by an external DC voltage (VEN), as shown, to adjust the output
current to a value below the nominal average value defined by Rs.
D1
Rs 0.13Ω
L1
68
μH
10
μF
C1
VIN (6V-40V)
VIN
VSET
ISENSE
LX
UM1360
LED
3W
The average output current is given by:
IOUT=(0.1*VEN)/(2.5*Rs) [for 0.3V<VEN<2.5V]
Note that 100% brightness setting corresponds to:
(2.5V≤VEN≤5V)
Output Current Adjustment by PWM Control
A Pulse Width Modulated (PWM) signal with duty cycle PWM can be applied to the VSET
pin, as shown below, to adjust the output current to a value below the nominal average value
set by resistor Rs:


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