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
V
DD
NJU6080
VREF
( 0.2V )
R
S
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. R
S
4. LED
5. EN
6. V
DD
Ver.2010-06-25
-1-
NJU6080
■
ABSOLUTE MAXIMUM RATINGS
( T
a
= 25°C )
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
V
DD
- 0.3 ~ + 7.0
V
Output Voltage
V
LED
- 0.3 ~ + 7.0
V
Output Current
I
LED
200
mA
EN Pin Voltage
V
EN
+ 7.0 ( *1 )
V
PWM Pin Voltage
V
PWM
+ 7.0 ( *1 )
V
Power Dissipation
P
D
400 ( *2 )
MW
Operating Temperature
T
opr
- 40 ~ + 85
°C
Storage Temperature
T
stg
- 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
V
DD
V
LED
CONDITIONS
MIN.
2.5
-
TYP.
-
-
( T
a
= 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
R
S
Pin Leak Current
PWM Pin ON Delay Time
PWM Pin OFF Delay Time
Maximum Output Current
( V
DD
= 3.0V, V
LED
= 0.5V, R
S
= 10Ω, V
EN
= V
PWM
= V
DD
, Ta = 25°C )
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT
I
DD
-
150
260
µA
I
DD_OFF
V
EN
= GND
-
-
0.1
µA
∆I
LED
- 1.8
-
+ 1.8
%
V
LED1
I
LED
= 20mA
-
0.3
0.4
V
V
LED2
I
LED
= 100mA
-
0.4
0.5
V
I
LEAK1
V
EN
= GND, V
DD
= V
LED
= 5.5V
-
-
0.1
µA
I
LEAK2
V
PWM
= GND, V
DD
= V
LED
= 5.5V
-
-
0.1
µA
V
EN_ON
I
LED
= OFF
→
ON
1.6
-
V
DD
V
V
EN_OFF
I
LED
= ON
→
OFF
0
-
0.3
V
V
PWM_ON
I
LED
= OFF
→
ON
0.7V
DD
-
V
DD
V
V
PWM_OFF
I
LED
= ON
→
OFF
0
-
0.3V
DD
V
I
EN
-
-
0.1
µA
I
PWM
-
-
0.1
µA
I
LEAK_RS
V
EN
= GND, V
RS
= V
LED
= 3V
-
-
0.1
µA
t
PWM_ON
V
PWM
= L
→
H
-
2.5
-
µs
t
PWM_OFF
V
PWM
= H
→
L
-
0.1
-
µs
I
LED_MAX
R
S
= 0
Ω
100
200
-
mA
-2-
Ver.2010-06-25
NJU6080
■
APPLYCATION CIRCUIT
V
LED
Output Current Wave
at PWM Dimming
I
LED
V
DD
NJU6080
VREF
( 0.2V )
R
S
Current Limit /
Thermal Shut Down
Control
Logic
Current Sence Resistor
V
DD
0
LED
I
LED
I
LED
= 0.2 / R
S
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 )
-4-
Ver.2010-06-25
NJU6080
■
TYPICAL CHARACTERISTICS
Quiescient Current vs. Temperature
300
1
Quiescient Current at OFF vs. Temperature
250
Quiescient Current at OFF : I
DD_OFF
( µA )
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 : I
LEAK
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-
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