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PDF NCV78763 Data sheet ( Hoja de datos )
| Número de pieza | NCV78763 | |
| Descripción | Power Ballast and Dual LED Driver | |
| Fabricantes | ON Semiconductor | |
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NCV78763
Power Ballast and Dual LED
Driver for Automotive Front
Lighting 2nd Generation
The NCV78763 is a single−chip and high efficient smart Power
ballast and Dual LED DRIVER designed for automotive front lighting
applications like high beam, low beam, daytime running light (DRL),
turn indicator, fog light, static cornering and so on.
The NCV78763 is a best fit for high current LEDs and provides a
complete solution to drive two strings up to 60 V, by means of two
internal independent buck switch channel outputs, with a minimum of
external components. For each individual LED channel, the output
current and voltage can be customized according to the application
requirements. An on−chip diagnostic feature for automotive front
lighting is provided, easing the safety monitoring from the
microcontroller. The device integrates a current−mode voltage booster
controller, realizing a unique input current filter with a limited BOM.
When more than two LED channels are required on one module, then
two, three or more NCV78763 devices can be combined, with the
possibility for the booster circuits to operate in multiphase−mode. This
helps to further optimize the filtering effect of the booster circuit and
allows a cost effective dimensioning for mid to high power LED systems.
Due to the SPI programmability, one single hardware setup can support
multiple system configurations for a flexible platform solution approach.
Features
• Single Chip Boost−Buck Solution
• Two LED Strings up to 60 V
• High Current Capability up to 1.6 A DC per Output
• High Overall System Efficiency
• Minimum of External Components
• Active Input Filter with Low Current Ripple from Battery
• Integrated Switched Mode Buck Current Regulator
• Integrated Boost Current−mode Controller
• Programmable Input Current Limitation
• Average Current Regulation Through the LEDs
• High Operating Frequencies to Reduce Inductor Sizes
• Integrated PWM Dimming with Wide Frequency Range
• Low EMC Emission for LED switching and dimming
• SPI Interface for Dynamic Control of System Parameters
• These are Pb−Free Devices
Typical Applications
• Front Lighting High Beam and Low Beam
• Day time Running Light (DRL)
• Position or Park light
• Turn Indicator
• Fog Light and Static Cornering
www.onsemi.com
SSOP36 EP
CASE 940AB
1 32
QFN32 7x7
CASE 485J
1 32
QFN32
CASE 488AM
MARKING DIAGRAMS
NV78763−x
AWLYYWWG
SSOP36
1
N78763−x
AWLYYWWG
QFN32
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
page 46 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
February, 2015 − Rev. 3
1
Publication Order Number:
NCV78763/D
1 page  
MCU
NCV78763
VBAT
(after rev. pol. Prot.)
C_BST_IN
L_BST
RPD_BST
D_BST
C_BST
C_BC2
C_BC1
R_BC1
5V (5V MCU assumed)
R_SDO
C_BB
C_DRIVE
C_DD
RSENSE_BST
C_M3V
VGATE
COMP
BSTSYNC
IBCK1SENSE+
IBCK1SENSE−
VINBCK1
VBB
VDRIVE
VDD
ON Semiconductor LBCKSW1
LED driver
VLED1
Front Lighting
IBCK2SENSE+
NCV78763
IBCK2SENSE−
VINBCK2
LEDCTRL1
LEDCTRL2
SPI_SCLK
SPI_SDI
SPI_SDO
SPI_CSB
TST TST1 TST2
LBCKSW2
VLED2
GND GNDP EP
RBUCK_1
L_BCK_1
D_BCK_1
R_VLED_1
C_BCK_1
LED−string 1
RBUCK_2
L_BCK_2
D_BCK_2
R_VLED_2
LED−string 2
C_BCK_2
PWR GND
Sig GND
Figure 4. NCV78763 Application Diagram
Note A: as reported in the application diagram, the device pins TST, TST2 & TST1 must be connected to the signal ground GND.
Note B: external capacitors or RC may be added to these SPI lines for stable communication in case of application noise. The selection
of these components must be done so that the resulting waveforms are respecting the limits reported in Table 19.
Note C: recommended values for the external MOSFET pull down resistor RPD_BST range from 10 kW to 33 kW.
Note D: the minimum value for the LED feedback resistors R_VLED_1 and R_VLED_2 is 1 kW.
www.onsemi.com
5
5 Page 
NCV78763
Table 11. BOOSTER CONTROLLER − VOLTAGE REGULATION PARAMETERS
Characteristic
VGATE comparator to
start BST_TOFF time
Booster PWM
frequency (when from
internal generation)
Booster PWM freq.
increase per code
Symbol
BST_VGATE_THR_1
BST_VGATE_THR_0
BST_FREQ_31
BST_FREQ_01
BST_FREQ_00
Conditions
FOSC8M / 38
FOSC8M / 8
PWM clock disabled
SPI Setting
Min
[VBOOST_VGATE_THR = 1]
[VBOOST_VGATE_THR = 0]
[BOOST_FREQ = 11111] 187
[BOOST_FREQ = 00001] 890
[BOOST_FREQ = 00000]
Typ
1.2
0.4
210
1000
0
Max
234
1110
DBST_FREQ
Nonlinear increase, 5 bits
5−112
Unit
V
V
kHz
kHz
kHz
kHz
BST_TOFF_MIN_3
[VBOOST_TOFFMIN = 11] 100 155 210
Booster minimum OFF
time (Note 18)
BST_TOFF_MIN_2
BST_TOFF_MIN_1
[VBOOST_TOFFMIN = 10] 140 195 250
[VBOOST_TOFFMIN = 01] 30
75 120
BST_TOFF_MIN_0
[VBOOST_TOFFMIN = 00] 70 115 160
BST_TON_MIN_3
[VBOOST_TONMIN = 11] 235 300 365
Booster minimum ON
time (Note 18)
BST_TON_MIN_2
BST_TON_MIN_1
[VBOOST_TONMIN = 10] 200 260 320
[VBOOST_TONMIN = 01] 150 200 250
BST_TON_MIN_0
[VBOOST_TONMIN = 00] 100 150 200
16. The following condition must always be respected: BST_REG_XX + BST_OV_X < 68 V.
17. The higher levels indicated in the cells are valid for BST_VLIMTH_2 and BST_VLIMTH_3 selection (BOOST_VLIMTH<1> = 1).
18. Rise and fall time of the VGATE is not included.
ns
ns
ns
ns
ns
ns
ns
ns
Table 12. BOOSTER CONTROLLER − CURRENT REGULATION PARAMETERS
Characteristic
Current comparator for
Imax detection
Current comparator for
VBOOST regulation,
offset voltage
Symbol
BST_VLIMTH_3
BST_VLIMTH_2
BST_VLIMTH_1
BST_VLIMTH_0
BST_OFFS
Conditions
SPI setting
[BOOST_VLIMTH = 11]
[BOOST_VLIMTH = 10]
[BOOST_VLIMTH = 01]
[BOOST_VLIMTH = 00]
Min Typ Max Unit
95 100 105 mV
75 80 85 mV
57 62.5 67 mV
45 50 55 mV
−5 0
5 mV
Booster slope
compensation
Booster Current
Sense voltage
common mode range
BST_SLPCTRL_3
BST_SLPCTRL_2
BST_SLPCTRL_1
BST_SLPCTRL_0
CMVSENSE
(no slope control)
[BOOST_SLPCTRL = 11]
[BOOST_SLPCTRL = 10]
[BOOST_SLPCTRL = 01]
[BOOST_SLPCTRL = 00]
−0.1
20
10
5
0
mV/ ms
mV/ ms
mV/ ms
mV/ ms
1V
Table 13. BOOSTER CONTROLLER − MOSFET GATE DRIVER
Characteristic
High−side switch
impedance
Symbol
RONHI
Conditions
Min Typ Max Unit
2.5 4
W
Low−side switch
impedance
RONLO
2.5 4
W
Table 14. BUCK REGULATOR − INTERNAL SWITCHES CHARACTERISTICS
Characteristic
Buck switch On
resistance
Symbol
RDS(on)
Conditions
At room−temperature, I(VINBCKx) pin = 1.5 A,
(VBOOST−VINBCKx) = 0.2 V
Min Typ Max Unit
0.65 W
RDS(on)_hot
At Tj = 150°C, I(VINBCKx) pin = 1.5 A,
(VBOOST−VINBCKx) = 0.2 V
0.9 W
www.onsemi.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NCV78763.PDF ] | |
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