NCV7683
Enhanced 100 mA Linear
Current Regulator and
Controller for Automotive
Sequenced LED Lighting
The NCV7683 consists of eight linear programmable constant
current sources. The part is designed for use in the regulation and
control of LED based Rear Combination Lamps and blinking
functions for automotive applications. System design with the
NCV7683 allows for two programmed levels for stop (100% Duty
Cycle) and tail illumination (programmable Duty Cycle), or an
optional external PWM control can be implemented.
LED brightness levels are easily programmed (stop is programmed
to the absolute current value, tail is programmed to the duty cycle)
with two external resistors. The use of an optional external ballast FET
allows for power distribution on designs requiring high currents. Set
back power limit reduces the drive current during overvoltage
conditions. This is most useful for low power applications when no
external FET is used.
Sequencing functionality is activated, controlled, and programmed
by individual pins. In addition to programming of the sequence
interval, the device can sequence 8 individual output channels, 4 pairs
of output channels, 2 quad output channels, or all 8 at once (for multi
IC use at high currents).
Enhanced features of this device are a global enable function and
display sequencing.
The device is available in a SSOP−24 package with exposed pad.
Features
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MARKING DIAGRAM
SSOP24 NB EP
CASE 940AP
NCV7683G
AWLYYWW
NCV7683 = Specific Device Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
NCV7683DQR2G
Package
SSOP24−EP
(Pb−Free)
Shipping
†
2500 /
Tape & Reel
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
These are Pb−Free Devices
Constant Current Outputs for LED String Drive
LED Drive Current up to 100 mA per Channel
Open LED String Diagnostic with Open−Drain Output in All Modes
Slew Rate Control Eliminates EMI Concerns
Low Dropout Operation for Pre−Regulator Applications
External Modulation Capable
On−chip 800 Hz Tail PWM Dimming
Single Resistor for Stop Current Set Point
Single Resistor for Tail Dimming Set Point
Overvoltage Set Back Power Limitation
Improved EMC Performance
Applications
Programmable Latch−Off function on Open String
•
Rear Combination Lamps (RCL)
♦
Restart Option of Unaffected Strings
•
Daytime Running Lights (DRL)
Over Temperature Fault Reporting
•
Fog Lights
Global Enable
•
Center High Mounted Stop Lamps (CHMSL) Arrays
Display Sequencing
•
Turn Signal and Other Externally Modulated Applications
SSOP−24 Fused Lead Package with Exposed Pad
•
Signature Lamp
AEC−Q100 Qualified and PPAP Capable
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
©
Semiconductor Components Industries, LLC, 2016
1
February, 2018 − Rev. 3
Publication Order Number:
NCV7683/D
NCV7683
Table 1. APPLICATION I/O TRUTH TABLE
EN
1
0
0
0
0
0
0
0
0
0
SEQON
X
0
0
0
0
0
0
1
1
1
STOP
INPUT
X
0
1
1
1
0
0
X
X
X
TAIL
MODE
X
0
X
X
X
1
1
X
X
X
OUTx LATCH OFF
(w/ LO = GND)
no
no
no
no
yes
no
no
no
no
yes
OUTX
CURRENT
OFF
OFF
I
STOP
I
STOP
OFF
PWM
PWM
I
STOP
I
STOP
OFF
FAULT
STATE*
−
−
NORMAL
OPEN CIRCUIT***
OPEN CIRCUIT***
NORMAL
OPEN CIRCUIT***
NORMAL
OPEN CIRCUIT***
OPEN CIRCUIT***
DIAG
STATE**
1
1
0
1
1
0
PWM
0
1
1
Reference Figures below.
X = don’t care
0 = LOW
1 = HIGH
* Open Circuit, RSTOP Current Limit, Set Back Current Limit down 20%, and thermal shutdown
**Pull−up resistor to DIAG and SEQOUT required.
*** OPEN CIRCUIT = Any string or SEQOUT open.
DIAG
DIAG
Open String Occurs
on
OUTx
Current
off
Open String Removed
on
OUTx
Current
off
Open String Occurs
Open String Removed
on
OUTx
Current
off
on
Outputs with no open string.
OUTx
Current
off
Outputs with no open string.
Figure 5. DIAG timing diagram WITH
Open String Latch Active
All outputs latch off.
Figure 6. DIAG timing diagram WITHOUT
Open String Latch Active
No outputs are turned off.
DIAG will report the state.
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4
NCV7683
Sequence Programming Timing Diagrams
The four timing diagrams show the options available for sequencing of the 8 outputs dependent on the state of SEQ1 and SEQ2.
1. 8 individual sequence intervals.
2. 4 pairs of sequence intervals.
3. 2 quads of sequence intervals.
4. 1 single sequence interval.
Sequencing_on
Sequencing_on
ENABLE
OUT1
(current)
ENABLE
OUT1
(current)
OUT2
(current)
OUT2
(current)
OUT3
(current)
Sequence
Interval
OUT3
(current)
OUT4
(current)
OUT4
(current)
Sequence
Interval
OUT5
(current)
OUT5
(current)
OUT6
(current)
OUT6
(current)
OUT7
(current)
OUT7
(current)
OUT8
(current)
OUT8
(current)
SEQOUT
Sequence Time
SEQOUT
Sequence Time
Figure 7. Sequencing Timing Diagram
(SEQ1 = 0, SEQ2 = 0)
Figure 8. Sequencing Timing Diagram
(SEQ1 = 1, SEQ2 = 0)
Sequencing_on
Sequencing_on
ENABLE
OUT1
(current)
ENABLE
OUT1
(current)
OUT2
(current)
OUT2
(current)
OUT3
(current)
OUT3
(current)
OUT4
(current)
OUT4
(current)
OUT5
(current)
OUT5
(current)
OUT6
(current)
Sequence
Interval
OUT6
(current)
OUT7
(current)
OUT7
(current)
OUT8
(current)
OUT8
(current)
SEQOUT
Sequence Time
SEQOUT
Sequence Time
Figure 9. Sequencing Timing Diagram
(SEQ1 = 0, SEQ2 = 1)
Figure 10. Sequencing Timing Diagram
(SEQ1 = 1, SEQ2 = 1)
The sequencing function is triggered by a logic level high to low signal on the ENABLE pin.
0=ground
1=floating
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5
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