NJU6080
CONSTANT CURRENT LED DRIVER with PWM CONTROL
■ GENERAL DESCRIPTION The NJU6080 is a constant current LED driver with PWM control. NJU6080 can reduce board density compared with the case composed discrete because the constant current value can be set with one resistance. It can contribute to the reliability improvement of the system because it has an over current protection circuit and thermal shutdown circuit. The NJU6080 is suited for a LCD back light and toys, etc. ■ PACKAGE OUTLINE
NJU6080F1
■ FEATURES ● Supply Voltage Range : 2.5V ~ 5.5V ● LED Output Current : 100mA ( max. ) ● Output Current Accuracy : ± 1.8% ● Operating Current : 150µA ( typ. ) ● One white LED can be lit. ● External Parts : Current limitation resistance ● Internal Thermal Overload Protection ● Internal Over Current Protection ● CMOS Technology ● Package Outline : SOT-23-6
■ BLOCK DIAGRAM
VDD NJU6080 VREF ( 0.2V ) RS Current Limit / Thermal Shut Down Control Logic LED
GND
EN
PWM
■ PIN CONFIGRATION
6 5 4
NJU6080
1 2 3
1. PWM 2. GND 3. RS 4. LED 5. EN 6. VDD
Ver.2010-06-25
-1-
NJU6080
■ ABSOLUTE MAXIMUM RATINGS ( Ta = 25°C ) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VDD - 0.3 ~ + 7.0 V Output Voltage VLED - 0.3 ~ + 7.0 V Output Current ILED 200 mA EN Pin Voltage VEN + 7.0 ( *1 ) V PWM Pin Voltage VPWM + 7.0 ( *1 ) V Power Dissipation PD 400 ( *2 ) MW Operating Temperature Topr - 40 ~ + 85 °C Storage Temperature Tstg - 40 ~ + 125 °C (*1) : When input voltage is less than +7V, the absolute maximum control voltage is equal to the input voltage. (*2) : Mounted on glass epoxy board ( 76.2 × 114.3 × 1.6mm: 2Layers FR-4 )
■ RECOMMENDED OPERATING CONDITION PARAMETER Supply Voltage Output Voltage SYMBOL VDD VLED CONDITIONS MIN. 2.5 TYP. ( Ta = 25°C ) MAX. UNIT 5.5 V 5.5 V
■ ELECTRICAL CHARACTERISTICS PARAMETER Quiescent Current Quiescent Current at OFF Output Current Accuracy Output Pin Voltage 1 Output Pin Voltage 2 Output Pin Leak Current 1 Output Pin Leak Current 2 EN Pin ON Voltage EN Pin OFF Voltage PWM Pin ON Voltage PWM Pin OFF Voltage EN Pin Input Current PWM Pin Input Current RS Pin Leak Current PWM Pin ON Delay Time PWM Pin OFF Delay Time Maximum Output Current ( VDD = 3.0V, VLED = 0.5V, RS = 10Ω, VEN = VPWM = VDD, Ta = 25°C ) SYMBOL CONDITIONS MIN. TYP. MAX. UNIT IDD 150 260 µA IDD_OFF VEN = GND 0.1 µA ∆ILED - 1.8 + 1.8 % VLED1 ILED = 20mA 0.3 0.4 V VLED2 ILED = 100mA 0.4 0.5 V ILEAK1 VEN = GND, VDD = VLED = 5.5V 0.1 µA ILEAK2 VPWM = GND, VDD = VLED = 5.5V 0.1 µA VEN_ON ILED = OFF → ON 1.6 VDD V VEN_OFF ILED = ON → OFF 0 0.3 V VPWM_ON ILED = OFF → ON 0.7VDD VDD V VPWM_OFF ILED = ON → OFF 0 0.3VDD V IEN 0.1 µA IPWM 0.1 µA ILEAK_RS VEN = GND, VRS = VLED = 3V 0.1 µA tPWM_ON VPWM = L → H 2.5 µs tPWM_OFF VPWM = H → L 0.1 µs ILED_MAX RS = 0 Ω 100 200 mA
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Ver.2010-06-25
NJU6080
■ APPLYCATION CIRCUIT
VLED Output Current Wave at PWM Dimming ILED VDD NJU6080 VREF ( 0.2V ) RS Current Limit / Thermal Shut Down Control Logic Current Sence Resistor VDD 0 LED ILED ILED = 0.2 / RS
GND
EN
PWM Control signal at PWM Dimming
H : Active L : Standby
H : LED ON L : LED OFF
Ver.2010-06-25
-3-
NJU6080
■ TYPICAL CHARACTERISTICS
Supply Voltage vs. Quiescent Current
300 0.1
Supply Voltage vs. Quiescent Current at OFF Quiescent Current at OFF : IDD_OFF ( nA )
0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 VLED = 0.5V RS = 10Ω EN = GND PWM = VDD Ta = 25ºC
250
Quiescent Current : IDD ( µA )
VLED = 0.5V RS = 10Ω EN = PWM = VDD Ta = 25ºC
200
150
100
50
0 0 1 2 3 4 5 6 7
0
1
2
3
4
5
6
7
Supply Voltage : VDD ( V )
Supply Voltage : VDD ( V )
Output Voltage vs. Output Pin Leak Current1
0.3 VDD = 5.5V RS = 10Ω EN = GND PWM = VDD 0.3
Output Voltage vs. Output Pin Leak Current2
VDD = 5.5V RS = 10Ω EN = VDD PWM = GND
Output PinLeak Current2 : ILEAK2 ( nA )
2 3 4 5 6 7
Output Pin Leak Current1 : ILEAK( nA )
0.25
0.25
0.2
0.2
0.15
0.15
0.1
0.1
0.05
0.05
0 0 1
0 0 1 2 3 4 5 6 7
Output Voltage : VLED ( V )
Output Voltage : VLED ( V )
RS Pin Voltage vs. RS Pin Leak Current
0.5 350
Output Voltage vs. Muximum Output Current Muximum Output Current : ILED_MAX (mA
RS=0Ω EN=PWM=VDD VLED: 4w ire Ta = 25ºC
0.45
RS Pin Leak Current : ILEAK_RS ( nA )
0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0
VLED = 3.0V RS = OPEN PWM = EN = VDD = 3.0V Ta = 25ºC
300
250
200
150
100 VDD=2.5V 50 VDD=3V VDD=5.5V 0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
RS Pin Voltage : VRS ( V )
Output Voltage : VLED ( V )
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Ver.2010-06-25
NJU6080
■ TYPICAL CHARACTERISTICS
Quiescient Current vs. Temperature
300 1
Quiescient Current at OFF vs. Temperature
250
Quiescient Current at OFF : IDD_OFF ( µ A )
0.1
Quiescient Current : IDD ( µA )
200
0.01
150
0.001
100
0.0001
50
VDD=2.5V VDD=3V VDD=7V
0.00001
VDD=2.5V VDD=3.0V VDD=7.0V
0 -50
0
50
100
150
0.000001 -50
0
50
100
150
Temperature : Ta ( ºC )
Temperature : Ta ( ºC )
Output Leak Current 1 vs. Temperature
1000 1000
Output Leak Current 2 vs. Temperature
Output Leak Current 1 : ILEAK ( nA )
100
Output Leak Current 2 : ILEAK 2 ( nA )
100
10
10
1
1
0.1
VLED=0.5V VLED=1V VLED=3V VLED=7V
0.1
VLED=0.5V VLED=1V VLED=3V VLED=7V
0.01 -50
0
50
100
150
0.01 -50
0
50
100
150
Temperature : Ta ( ºC )
Temperature : Ta ( ºC )
EN Pin ON Voltage vs. Temperature
1.05 VDD=2.5V 1
EN_ON ( V ) EN Pin ON Voltage : V
EN Pin OFF Voltage vs. Temperature
1.05 VDD=2.5V 1
EN_OFF ( V ) EN Pin OFF Voltage : V
VDD=3V VDD=7V
VDD=3V VDD=7V
0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 -50
0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 -50
0
50
100
150
0
50
100
150
Temperature : Ta ( ºC )
Temperature : Ta ( ºC )
Ver.2010-06-25
-5-
NJU6080
■ TYPICAL CHARACTERISTICS
PWM ON Voltage vs. Temperature
4 4
PWM OFF Voltage vs. Temperature
3.5
PWM_ON ( V ) PWM ON Voltage : V
3.5
PWM OFF Voltage : V PWM_OFF ( V )
VDD=2.5V VDD=3V VDD=7V
3
3
2.5
2.5
2
2
1.5
1.5
1
1 VDD=2.5V VDD=3V VDD=7V
0.5
0.5
0 -50
0
50
100
150
0 -50
0
50
100
150
Temperature : Ta ( ºC )
Temperature : Ta ( ºC )
Muximum Output Current vs. Temperature
300
L Muximum Output Current : I ED_MAX ( m A )
Muximum Output Current vs. Temperature
300
L Muximum Output Current : I ED_MAX ( m A )
250
250
200
200
150
150
100 VDD=2.5V 50 VDD=3V VDD=5.5V VDD=7V 0 -50
100 VDD=2.5V 50 VDD=3V VDD=5.5V VDD=7V 0 -50
0
50
100
150
0
50
100
150
Temperature : Ta ( ºC )
Temperature : Ta ( ºC )
Supply Voltage vs. Output Current vs. Temperature
20.5 20.4 20.3 Ta=-50℃ Ta=25℃ Ta=125℃ 20.3 20.5 20.4
Output Current vs. Temperature
VDD=2.5V VDD=3V VDD=7V
Output Current : ILED ( m A )
Output Current : ILED ( mA )
0 1 2 3 4 5 6 7
20.2 20.1 20 19.9 19.8 19.7 19.6 19.5
20.2 20.1 20 19.9 19.8 19.7 19.6 19.5 -50
0
50
100
150
Supply Voltage : VDD ( V )
Temperature : Ta ( ºC )
-6-
Ver.2010-06-25
NJU6080
■ TYPICAL CHARACTERISTICS
Output Voltage vs. Output Current vs. Temperature
22 20.5 20.4 VLED=0.3V 20.3 VLED=0.4V VLED=0.5V 20.2 20.1 20 19.9 19.8 19.7 19.6 19.5 -50
Output Current vs. Temperature
21.5
20.5
20
19.5 Ta=-50℃ 19 Ta=25℃ Ta=125℃ 18.5
18 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
Output Current : ILED ( m A )
Output Current : ILED ( m A )
21
0
50
100
150
Output Voltage : VLED ( V )
Temperature : Ta ( ºC )
PWM_ON Delay Time vs. Temperature
8 VDD=2.5V
PWM_ON ( µ s ) PWM_ON Delay Time : T
PWM_OFF Delay Time vs. Temperature
0.1 0.09
7
VDD=5.5V 6 VDD=7V
PWM_OFF Delay Time : TPWM_OFF ( µ s )
VDD=3V
VDD=2.5V 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 -50 VDD=3V VDD=5.5V VDD=7V
5
4
3
2
1
0 -50
0
50
100
150
0
50
100
150
Temperature : Ta ( ºC )
Temperature : Ta ( ºC )
Ver.2010-06-25
-7-
NJU6080
[CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
-8-
Ver.2010-06-25
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