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FAN5617 Datasheet(PDF) 4 Page - Fairchild Semiconductor

Part No. FAN5617
Description  High-Efficiency, Constant-Current LED Driver with TinyWire Brightness Control
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN5617 Datasheet(HTML) 4 Page - Fairchild Semiconductor

 
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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5617 Rev. 1.0.1
Electrical Specifications
Unless otherwise noted, VIN = 2.7V to 5.5V, ILED = 2mA to 20mA, EN = HIGH, NBR = 31, TA = -40°C to +85°C. Typical
values are at 25°C.
Parameter
Conditions
Min.
Typ.
Max.
Units
Power Supplies
VIN Falling
1.6
V
Input Under-Voltage Lockout
VIN Rising
2.3
V
Current Matching with Unmatched LEDs
(3)
2mA ≤ ILED ≤ 15mA,
2.8V ≤ LED VF <4V
0.6
+3
%
VIN = 3.6V, IOUT = 15mA
240
255
270
ILED/ISET Ratio
ILED = 2 to 20mA
230
260
280
Reference Voltage for Current Set
588
600
612
mV
Start-up Time
(4)
COUT = 1µF, VIN = 3.6V, ILED = 15mA
200
270
500
µS
Minimum Cathode Voltage
ILED = 15mA
170
250
mV
Quiescent Current
VIN = 5.5V, IOUT = 5mA
250
µA
Shutdown Supply Current
EN=0V, DATAIN = VIN
(5)
0.1
1
µA
Output Short-Circuit Current
VIN = 5.5V, VOUT = 0V
65
80
mA
VOUT Over-Voltage Protection
6
V
VIN at Mode Transition from 1x to 1.5x
LED Vf = 3.5V, ILED = 3 x 20mA
3.9
V
VIN at Mode Transition from 1.5x to 2x
LED Vf = 3.5V, ILED = 3 x 20mA
2.9
V
Peak Efficiency
(6)
VIN = 3.75V, LED Vf = 3.4V,
ILED = 18mA
90
%
Oscillator Frequency
0.8
1
1.2
MHz
Thermal Shutdown Threshold
150
ºC
Thermal Shutdown Hysteresis
15
ºC
Logic Input Thresholds (EN and DATA)
Input Low Voltage
0.4
V
Input High Voltage
1.25
V
DATA Input Low Current
VIN = 3.6V
110
µA
Notes:
3.
Current Matching refers to the absolute value of the difference in the current between the two LED branches:
()
()
LEDj
LEDi
LEDj
LEDi
I
I
100
x
I
I
(%)
Matching
Current
+
where i, j = 1, 2, or 3.
4.
Start-up time is defined as the period from when the driver is turned on to the time when ILED is within 10% of its
programmed value.
5.
When DATA remains low, the TinyWire interface is biased on and consumes up to 30
μA of current.
6.
Efficiency is expressed as a ratio between the electrical power into the LEDs and the total power consumed from the
input power supply, expressed as:
IN
IN
3
1
i
LEDi
LEDi
I
x
V
I
x
V
Efficiency
=
Some vendors calculate the efficiency as a function of VOUT instead of LED VF. That method does not account
for the power lost due to the cathode voltage not being equal to zero, which overstates efficiency by up to 5%.


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