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PDF NCV7691 Data sheet ( Hoja de datos )
| Número de pieza | NCV7691 | |
| Descripción | Current Controller | |
| Fabricantes | ON Semiconductor | |
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NCV7691
Current Controller for
Automotive LED Lamps
The NCV7691 is a device which uses an external NPN bipolar
device combined with feedback resistor(s) to regulate a current for use
in driving LEDs. The target application for this device is automotive
rear combination lamps. A single driver gives the user flexibility to
add single channels to multichannel systems. A dedicated dimming
feature is included via the PWM input pin. The individual driver is
turned off when an open load or short circuit is detected.
LED brightness levels are easily programmed using an external
resistor in series with the bipolar transistor. The use of the resistor
gives the user the flexibility to use the device over a wide range of
currents.
Multiple strings of LEDs can be operated with a single NCV7691
device.
Set back power limit reduces the drive current during overvoltage
conditions.
The device is available in a SOIC−8 package.
Features
• Constant Current Output for LED String Drive
• External Bipolar Device for Wide Current Range Flexibility
♦ With BCP56 Transistor, Can Drive Multiple Strings Concurrently
(ref. Datasheet Info)
• External Programming Current Resistor
• Pulse Width Modulation (PWM) Control
• Negative Temperature Coefficient Current Control Option
• Open LED String Diagnostic
• Short−Circuit LED String Diagnostic
• Multiple LED String Control
• Overvoltage Set Back Power Limitation
• SOIC−8 Package
• AEC−Q100 Qualified and PPAP Capable
• These are Pb−Free Devices
Applications
• Rear Combination Lamps (RCL)
• Daytime Running Lights (DRL)
• Fog Lights
• Center High Mounted Stop Lamps (CHMSL) Arrays
• Turn Signal and Other Externally Modulated Applications
• General Automotive Linear Current LED Driver
www.onsemi.com
8
1
SOIC 8
CASE 751AZ
MARKING DIAGRAM
8
NCV7691
ALYW
G
1
IC (Pb−Free)
NCV7691 = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PINOUT DIAGRAM
VS SC
PWM BASE
FLTS FB
NTC GND
ORDERING INFORMATION
Device
Package
Shipping†
NCV7691D10R2G SOIC−8
(Pb−Free)
3000 /
Tape & Reel
†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, 2015
May, 2015 − Rev. 3
1
Publication Order Number:
NCV7691/D
1 page  
NCV7691
ELECTRICAL CHARACTERISTICS
(4.5 V < VS < 18 V, CFLTS = 0.1 mF, R1 = 1 W, Transistor NPN = BCP56, −40°C ≤ TJ ≤ 150°C, unless otherwise specified) (Note 3)
Characteristic
Conditions
Min Typ Max Unit
General Parameters
Supply Current in normal condition
VS = 14 V, PWM = 0
− 30 100 mA
VS = 14 V, PWM = High
Base current subtracted
− 3.0 4.0 mA
Supply Current in fault condition
Under Voltage Lockout
VS = 14 V, PWM = High
VFLTS ≥ FLTS Clamp (5.0 V typ.)
VS rising
− 1.8 2.8 mA
3.5 4.0 4.5
V
Under Voltage Lockout Hysteresis
− 200 − mV
Thermal Shutdown
(Note 4)
150 170 190
°C
Thermal Hysteresis
(Note 4)
− 15 − °C
Thermal Shutdown Delay
(Note 4)
10 23 36 msec
Base Current Drive
Output Source Current
BASE = 1 V, FB = 0 V
16 25 30 mA
Output Pull−Down Resistance
PWM = 0 V, BASE = 1 V, FB = 0 V
0.5 1
2 kW
Unity Gain Bandwidth
− 100 − kHz
Amplifier Trans−conductance
− 30 − mA/mV
Programming
FB Regulation Voltage
Under Voltage Lockout < VS < Over Voltage Fold
mV
Back Threshold 1
142 152 162
VS > Over Voltage Fold Back Threshold 1
54 76 100
VS > Over Voltage Fold Back Threshold 2
22 38 50
VS Overvoltage Fold Back Threshold 1
18.7 19.5 20.5
V
VS Overvoltage Fold Back Threshold 1
Hysteresis
− 700 − mV
VS Overvoltage Fold Back Threshold 2
30.3 31.4 32.5
V
VS Overvoltage Fold Back Threshold 2
Hysteresis
− 700 − mV
Open Load Timing
VS Open Load Disable Threshold
FLTS Charge Current
FLTS Pull Down Resistor
FLTS Threshold
(Output Deactivation Threshold)
VS falling
PWM = 5 V, FB = 0 V, VS = 14 V
8.0 8.5 8.8
123
400 600 800
1 1.15 1.3
V
mA
kW
V
FLTS Clamp
VS = 18 V, (Note 7) PWM = 5 V, Charge Current
4
5
6
V
activated
Above this clamp voltage Charge current rolls off
to 0
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
3. Designed to meet these characteristics over the stated voltage and temperature recommended operating ranges, though may not be 100%
parametrically tested in production.
4. Guaranteed by design.
5. NTC = 400 mV is > NTC detection level and is a higher impedance than when operating within the detection level.
6. Evaluated at VS = 14V, (LED string current)max = 15 mA to 37 mA.
7. Device tested at 18 V. Upper limit of 6 V applies across the VS input supply range, but the maximum rating for FLTS (−0.3V to VS to −0.3V)
must be considered for all system designs especially at the minimum extreme of VS = 4.5 V.
www.onsemi.com
5
5 Page 
NCV7691
Temperature Compensation
The NCV7691 device typically operates with a zero TC
output current source. The NTC (Negative Temperature
Coefficient) pin provides an alternative for an output current
which degrades with temperature as defined by the
designer’s external components.
Zero TC operation is provided when the NTC pin is
connected to GND. When a negative temperature
coefficient output current is desired to compensate for
effects of external LED illumination, the setup shown in
Figure 11 will provide the function. On the NTC pin, a
comparator detects when the voltage is higher than typ
220 mV, and this voltage is used to provide the feedback
reference voltage for the current feedback regulation loop.
The zener provides a reference voltage for the negative
temperature coefficient NTC device through an external
divider. Be careful of your choice of the zener diode as the
VS
temperature coefficients of the devices have a wide variation
with the low voltage zeners having a high negative
temperature coefficient and the high voltage zeners having
a positive temperature coefficient. The regulation loop
voltage on NTC should be sufficiently higher than the
220 mV reference voltage to avoid interactions. A typical
regulation voltage of 1.6 V is suggested.
The overall tolerance specification for the NTC
functionality is broken down into two components.
1. Absolute error. A ±2% tolerance is attributed to
the expected value as a result of internal circuitry
(most predominantly the 1/10 resistor divider).
2. Reference error. A ± 7mV offset mismatch in the
circuitry referenced to FB.
This provides a part capability of (V(NTC)/10) x 0.98
−7mV < V(FB) < (V(NTC)/10) x 1.02 + 7mV.
VS
D1
SZMM3Z4V7T1G
4.7 V (typ)
NTC
0.4 V to 2.1 V
−
+
BASE
FB
LH
HL
152 mV
GND
220 mV
Figure 11. Negative Temperature Compensation Operation
www.onsemi.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet NCV7691.PDF ] | |
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