NCV7680PWR2G ON Semiconductor, NCV7680PWR2G Datasheet - Page 12

• Manufacturer Part Number: NCV7680PWR2G
• Description: IC LED REAR COMBO LAMP 16SOIC
• Manufacturer: ON Semiconductor

Specifications of NCV7680PWR2G

• Constant Current: Yes
• Topology: Linear (LDO), PWM
• Number Of Outputs: 8
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Voltage - Supply: 6 V ~ 16 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Current - Output / Channel: 75mA
• Output Type: Fixed
• Input Voltage Max: 5 V
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 150 C
• Operating Temperature (max): 150C
• Operating Temperature (min): -40C
• Pin Count: 16
• Mounting: Surface Mount
• Package Type: SOIC W
• Screening Level: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Frequency: -
• Operating Temperature: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: NCV7680PWR2G; NCV7680PWR2GOSTR

General
constant current sources. The part is designed for use in the
regulation and control of LED based Rear Combination
Lamps for automotive applications. System design with the
NCV7680 allows for two brightness levels; one for stop, and
one for tail illumination.
absolute value, tail current duty cycle value) with two
external resistors.
on designs requiring high currents. Additionally, set back
power limit reduces the drive current during overvoltage
conditions. Set back power limit is most useful for low
current applications when no external FET is used.
to regulator systems, such as current limit, thermal limit, and
provides an open load diagnostic that coincides with the
STOP input signal.
Open String Reporting (DIAG)
high with STOP Input high, or a combination of STOP Input
high and TAIL Input high. Reference Table 1 on page 5 for
more details. Open circuit is sensed on each of the 8 outputs.
The typical threshold voltage for detection is 0.4 V. Care
must be taken not to breach this voltage level under normal
operation , or a false open will be reported. Make sure worst
case system design focuses on the voltage level on top of the
LED string (top anode) (V
case LED voltage drop while considering temperature
effects.
Input Voltage and Set Back Current
supply voltage. Low dropout is a key attribute for providing
consistent LED light output at low line voltage. Unlike
adjustable regulator based constant current source schemes
where the set point resistor resides in the load path, the
NCV7680’s set point resistor lies outside the LED load path,
and aids in the low dropout capability.
During a Setback Current Limit event, the drive current is
The NCV7680 consists of eight linear programmable
Brightness levels are easily programmed (stop current
The use of an external FET allows for power distribution
The NCV7680 offers all of the built in protection normal
Open string detection is reported on the DIAG pin as a
Automotive battery systems have wide variations in line
Setback Current Limit is employed during high voltage.
STRING
) and includes the worst
DETAILED OPERATING DESCRIPTION
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12
reduced resulting in lower power dissipation on the IC. This
occurs during high battery voltage (V
the NCV7680 can operate in extreme conditions and still
provide a controlled level of light output
Reference Figures 19 and 20 for Power Limiting Behavior.
Quiescent Current Power
achieved by moving the V
external FET. The contribution of power at the NCV7680
caused by the quiescent current into V
lower operating voltage of V
Note also the addition of an external resistor Rsd in Figure
21. This will be required to insure startup of the system. A
value for Rsd should be chosen low enough to provide
current into V
under all required input voltage input conditions. Rsd’s
value should be chosen lower for slow rising V
avoid switching between an Output Disable state and an
Open Circuit state during power−up.
The Overvoltage condition is reported on the DIAG Pin.
Further reduction in power to the NCV7680 can be
Low Drop−out
Area
Low Drop−out
Area
Constant Current Area
Constant Current Area
P
Figure 19. Ballast FET Power
and the current in the I
Figure 20. IC Power
P
pin connection to the drain of the
P
Only Voltage Effects
with the new connection.
Only Voltage Effects
Overvoltage
Set Back
Area
Overvoltage
Set Back
Area
LEDs
P
P
is lowered due to the
> 16 V). In this way
& feedback string
bat
180°C (typ)
180°C (typ)
Shutdown
Thermal
Shutdown
signals to
Voltage
Thermal
Voltage