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PDF LC5710S Data sheet ( Hoja de datos )

Número de pieza LC5710S
Descripción power IC for LED driver
Fabricantes SANKEN 
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LC5710S DATA SHEET
LC5710S
DATA SHEET Rev.1.9
Rev.1.9
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.1

1 page




LC5710S pdf
LC5710S DATA SHEET
Rev.1.9
3.Electrical Characteristics
Certain details refer to the specification sheet of this product.
The polarity value for current specifies a sink as “+” and a source as “−”, referencing the IC.
3.1 Electrical Characteristics of Control Part (MIC) Unless specifically noted, Ta is 25°C, VIN=15V
Table.3
Parameter
Terminal Symbol
Ratings
Units
MIN TYP MAX
Remarks
O p e r a t i o n S t a r t V o l t a g e 5−3 VIN(ON) 3.8 4.1 4.5 V
Operation Stop Voltage
5−3 VIN(OFF) 3.4 3.7 4.2 V
Operation Hysteresis Voltage
5−3 VIN(HYS) 0.25 0.37 0.50
V
Supply Current
(6) 5−3
IIN(ON)
1.6
mA
Supply Current in No Operation (6) 53
IIN(OFF)
0.24
mA VIN= 3V
Oscillator Frequency1
fOSC1 80 100 135 kHz RRT=180kΩ
Oscillator Frequency2
fOSC2 350 500 650 kHz RRT=18kΩ
Minimum On Time
Maximum Duty Cycle
Current Sense Voltage
tON(MIN)
100
200
300
ns VCOMP= 0V
DMAX 84
90
95
%
VCOMP= 2.8
V
67 VCS
97 100 103 mV
SW Current Limit
43
ISW(LIM)
1.4
1.8
2.2
A
CSP Input Current
63 ICSP 22 35 50 µA
CSN Input Current
73 ICSN
5 9.5 18 µA
COMP Terminal Source Current
13 ICOMP(SO) -65
-50
-35
µA
VCS=20mV
VCOMP=2V
COMP Terminal Sink Current
13
ICOMP(SI)
35
50
65
µA
VCS=180mV
VCOMP=2V
Error Amplifier Conductance
(6)
GM
4.2
mS
VCS=70
~130mV
Over Voltage Threshold
67 VCS(OVP) 140 150 160 mV
Setup time of Watch Dog Timer (6)
TWDT
30
mS
Vcomp=2.5V
Vcs=short
DIM Voltage in LED On at
Dimming mode
83 VDIM(ON) 0.17 0.20 0.23
V
DIM Voltage in LED Off at
Dimming mode
83 VDIM(OFF) 0.12 0.15 0.18
V
DIM Hysteresis Voltage at
Dimming mode
83 VDIM(HYS)
10
50 100 mV
Thermal Shutdown
(6)
TSD
165 °C
Thermal Shutdown Hysteresis (6) TSD(HYS) 22 °C
(6) Guaranteed by design, not tested.
Copy Right: SANKEN ELECTRIC CO., LTD.
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LC5710S arduino
LC5710S DATA SHEET
Rev.1.9
LED string current is detected by the current detection resistor, RCS.
The voltage of RCS is detected by both CSP and CSN pins. This IC compares this voltage with the Current Detection
Voltage, VCS, and makes a target value for current control.
The constant current is controlled so that the detection voltage of peak current of internal power MOSFET is close to
the target value, and thus the LED string current is constant.
The constant current of LED string, IOUT, is calculated by the following with RCS as the current detection resistor and
ROVP as the resistor for overvoltage protection in the case that LED string is open.
IOUT VCS ICSN (RCS ROVP)
RCS
・・・(2)
where; ICSN : the CSN Pin Sink Current, 9.5μA.
VCS : the Current Detection Voltage, 100mV.
Also, IOUT can be expressed by the following, if ICSN×(RCS+ROVP) is negligibly small against VCS.
IOUT VCS
RCS
・・・(3)
ROVP value should be chosen so that IOUT is within the acceptable accuracy range referring to the calculation in 8.5
Overvoltage Protection Function (OVP).
8.3 LED Dimming
8.3.1 Analog dimming
The dimming of LC5710S copes with both of Analog (the input of a DC voltage) and PWM-digital-Dimming.
Though it is Analog-dimming first, there are relations of the fig.8(A),(B) in the input DC voltage of the DIM pin and
the dimming-ratio. Moreover,Dimming by the Pull-down resistor RDIM is possible by using a internal current-source
of the IC, too. The relations of the DIM pin voltage and RDIM are shown by the figure 8 (B). Dimming ratio is 100%
when the DIM pin voltage is more than DC 2V.
fig.8(A) DIM Pin voltage vs. LED Current
fig.8(B) Pull-down resistor RDIM vs. DIM pin voltage
Though LC5710S doesn't have an exclusive
"Remote ON/OFF pin",
But,"Remote ON/OFF function" is as well as
possible by using a DIM pin.
fig.8I The connection of RDIM and remote ONOFF application
From the port of the microcomputer of the use and so on, and if the DIM pin of LC5710S is held continuously to
the Lowlevel,LC5710S continues suspension of a movement. The Low levelvoltage must be lower voltage
than VDIM (OFF). For reverse logic, put one small signal Transistor as the fig8I.
Copy Right: SANKEN ELECTRIC CO., LTD.
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