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PDF LC5901S Data sheet ( Hoja de datos )
| Número de pieza | LC5901S | |
| Descripción | Single output LED driver IC | |
| Fabricantes | Sanken | |
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LC5901S DATA SHEET
LC5901S
DATA SHEET Rev.1.5
Rev.1.5
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.1
1 page  
LC5901S DATA SHEET
Rev.1.5
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=25°C、VIN=12V
Table.3
Items
Terminal Symbol
Ratings
Units
MIN TYP MAX
Remarks
Operation Start Voltage
2−3
VCC(ON)
6.5
7.0
7.5
V
Operation Stop Voltage
2−3
VCC(OFF)
6.0
6.5
7.0
V
Operation Hysteresis Voltage
2−3
VCC(HYS)
－
0.5
－
V
Supply Current
2−3
ICC(ON)
－
1.2
2.0 mA
Supply Current in No Operation
2−3
ICC(OFF)
－
0.35
0.5 mA VUVLO=0V
OFF Time1
4-3 TOFF1 6.4 8.4 9.8 usec RRT=80kΩ
OFF Time2
4-3
TOFF2
0.85
1.0
1.2 usec RRT=10kΩ
Maximum ON Time
4-3
tONMAX
170
220
280 usec
Minimum ON Time
REF voltage1
REF voltage2
PWM Pin ON Threshold voltage
4-3 tONMIN
－
－
1.3 usec
8-3
VREF1
0.980
1.0
1.020
V
RRT=12kΩ
RREF=10kΩ
8-3
VREF2
1.764
1.8
1.836
V
RRT=10kΩ
RREF=15kΩ
6-3 VPWM(ON) 1.7 2.0 2.5 V
PWM Pin OFF Threshold voltage
6-3 VPWM(OFF) 0.8 1.1 1.9 V
PWMPin Pull-down Resistance
6-3 RPWM 128 200 280 kΩ
OUT Pin Output Resistance(source) (5) 4-3
Ron_H
－
17
－Ω
OUT Pin Output Resistance(sink) (5) 4-3
Ron_L
－
14
－Ω
UVLO Pin ON Threshold voltage
7-3 VUVLO(ON) 0.75
1.00
1.3
V
UVLO Pin OFF Threshold voltage
7-3 VUVLO(OFF) 0.65
0.85
1.1
V
UVLO Pin Hysteresis Voltage
7-3 VUVLO(HYS) 0.05
0.15
0.25
V
UVLO Pin Discharge Resistance
UVLO Pin Discharge-Complete
Threshold Voltage
7-3 RUVLO 0.5 1.0 1.5 kΩ
7-3 VUVLO(RST) 180 250 320 mV
OCP Threshold voltage
1-3 VOCP 2.3 2.5 2.7 V
CS Pin Blanking Time
(5) 1-3
tLEB
－ 200 － nsec
Thermal-Shutdown Activation
Temperature
(5) －
TSD
－ 150 － °C
Thermal Shutdown Hysteresis
Temperature
(5) －
TSD(HYS)
－
30
－
(5) Guaranteed by design, not tested.
* The polarity value for current specifies a sink as “+” and a source as “−”, referencing the IC.
°C
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.5
5 Page 
LC5901S DATA SHEET
Rev.1.5
fig.8 RRT=47kΩ，VIN=110VDC condition, Number of LED vs. Ton & Frequency
Like this, switching-frequency rises relatively when a "OFF-Period" is set up short. Moreover, when there are
many LED's and VLED is high, it is the character that frequency is decreased because TON spreads out.
7.3 The Setup of reference voltage(VREF)
The reference voltage is set up by the value of the setup resistor RREF that it was connected to between the REF
terminal (pin 8) and GND terminal (pin 3) , and the setup resistor RRT that it was connected to between the RT
terminal (pin 5) and GND terminal (pin 3) . The reference voltage VREF is able to calculate with an equation (6).
The correlation of the reference voltage VREF to the resistance value of RREF is shown as the fig 9. The setup upper
limit voltage of the reference voltage is 2.5V.
Ω
Ω
fig.9 the relations of RREF vs. VREF .
Fig 9 is the relations of the reference voltage VREF set up by two resistance of RRT and RREF. By the resistance
detector RCS of fig 3, the IC detects the "average LED current" that is flowing to the LED string and the "average
LED current" is converted as the voltage signals. It is prediction controlled so that the value of the detected voltage
signal may become equal to the reference voltage VREF.
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.11
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