NCV78713
High Efficiency Buck Single
LED Driver with Integrated
Current Sensing for
Automotive Front Lighting
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The NCV78713 is a single-chip and high efficient Buck Single LED
Driver designed for automotive front lighting applications like high
beam, low beam, DRL (daytime running light), turn indicator, fog
light, static cornering, etc. The NCV78713 is in particular designed for
high current LEDs and provides a complete solution to drive 1 LED
string of up-to 60 V. It includes 1 current regulator for the LED string
and required diagnostic features for automotive front lighting with
a minimum of external components – the chip doesn’t need any
external sense resistor for the buck current regulation. The available
output current and voltage can be customized for the LED string.
When more than 1 LED channel is required on 1 module,
the NCV78713 can be combined with NCV78723 devices,
incorporating Buck Dual LED Driver. Thanks to the SPI
programmability, one single hardware configuration can support
various application platforms.
Features
1
24
QFN24
CASE 485CS
MARKING DIAGRAM
1
N78713−0
AWLYYWWG
G
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Single Chip
Buck Topology
1 LED String up-to 60 V
High Current Capability up to 1.6 A DC
High Overall Efficiency
Minimum of External Components
Integrated High Accuracy Current Sensing
Integrated Switched Mode Buck Current Regulator
Average Current Regulation through the LEDs
High Operating Frequencies to Reduce Inductor Sizes
Low EMC Emission for LED Switching and Dimming
SPI Interface for Dynamic Control of System Parameters
Fail Safe Operating (FSO) Mode, Stand-Alone Mode
N78713
A
WL
YY
WW
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 30 of
this data sheet.
Typical Applications
High Beam
Low Beam
DRL
Position or Park Light
Turn Indicator
Fog
Static Cornering
©
Semiconductor Components Industries, LLC, 2015
1
November, 2015 − Rev. 1
Publication Order Number:
NCV78713/D
NCV78713
TYPICAL APPLICATION SCHEMATIC
VBOOST
C_M3V
VBOOSTM3V VBOOST
External
VDD Supply
ON Semiconductor
LED Driver
1-Channel Buck
NCV78713
V
CC
of MCU
VDD
C_DD
LED-String
VINBCK
LBCKSW
C_BCK
L_BCK
D
R_LED
R_SDO
LBCKSW
RSTB
LEDCTRL
VLED
mC
C_LED
SCLK
SDI
SDO
CSB
EXPOSED
PAD
TEST1
TEST2
TEST
Figure 1. Typical Application Schematic
Table 1. PIN DESCRIPTION
Component
L_BCK
C_BCK
C_M3V
C_DD
C_LED
R_LED
R_SDO
D
Function
Buck Regulator Coil (see Buck Regulator Chapter for Details)
Buck Regulator Output Capacitor (see Buck Regulator Chapter for Details)
Capacitor for M3V Regulator
V
DD
Decoupling Capacitor
Optional VLED Pin Filter Capacitor (Note 2)
VLED Pin Serial Resistor (Notes 2 and 3)
SPI Pull-Up Resistor
Buck Regulator Free-Wheeling Diode
Typical Value
47
220
(see Table 6 − VBOOSTM3V)
470
1
Min. 1
1
e.g. MBRS2H100T3G
Unit
mH
nF
nF
nF
nF
kW
kW
1. Pin TEST has to be connected to ground. TEST1 and TEST2 pins can be connected to ground or left floating.
2. C_LED is optional. If used, time constant of the C_LED and R_LED filter has to be lower than minimal LEDCTRL ON time in PWM dimming
for proper VLED measurement.
3. R_LED is necessary to ensure Absolute Maximum Ratings of IVLED current (see Table 3).
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2
GND
NCV78713
PACKAGE AND PIN DESCRIPTION
24
NC
23
NC
22
NC
21
NC
20
NC
19
NC
1
TEST
VDD
SDI
18
2
TEST1
17
3
VBOOSTM3V
SCLK
16
NCV78713
4
VBOOST
CSB
15
5
TEST2
LEDCTRL
LBCKSW
SDO
14
GND/NC
7
8
9
10
VINBCK
6
GND
VLED
GND/NC
RSTB
13
11
12
Figure 4. Pin Connections
Table 2. PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
9, 11
10
12
13
14
15
16
17
18
19, 20, 21, 22, 23, 24
Pin Name
TEST
TEST1
VBOOSTM3V
VBOOST
TEST2
GND
VLED
LBCKSW
GND/NC
VINBCK
LEDCTRL
RSTB
SDO
CSB
SCLK
SDI
VDD
NC
Description
Test Pin
Test Pin
VBOOSTM3V Regulator Output Pin
Booster Input Voltage Pin
Test Pin
Ground
LED String Forward Voltage Sense Input
Buck Switch Output
GND/NC Connection in Application
Buck High Voltage Supply
LED String Enable
External Reset Signal
SPI Data Output
SPI Chip Select (Chip Select Bar)
SPI Clock
SPI Data Input
3 V Logic Supply
GND/NC Connection in the Application
I/O Type
LV In
LV IN/OUT HV Tolerant
HV OUT (Supply)
HV Supply
LV IN/OUT HV Tolerant
Ground
HV IN
HV OUT
NC
HV Supply
MV IN
MV IN
MV Open-Drain
MV IN
MV IN
MV IN
LV Supply
NC
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