NCV7680EVB/D
NCV7680 Evaluation Board
Manual
Prepared by: Frank Kolanko
ON Semiconductor
http://onsemi.com
EVALUATION BOARD MANUAL
Description
•
•
•
•
The NCV7680 is an octal LED driver designed for
automotive LED rear combination lamps. External
programmability of the NCV7680 allows the user to set the
tail current and stop currents using a single resistor for each
function. An optional external FET is used to help distribute
power for high power systems.
The Evaluation Board includes both an NCV7680 (octal
driver) and NTD2955 (FET). A switch on the board allows
the user to evaluate functionality with and without the FET.
The DIAG pin is brought out for reporting of open circuit
conditions.
The LED’s mounted on the demo board are jumpered
giving flexibility for evaluating customer defined loads.
•
•
•
Board Features
•
•
•
•
Part Features
• Constant Current Outputs for LED String Drive
• Open LED String Diagnostic with Open−Collector
•
•
•
On−chip 1 kHz Tail PWM Dimming
Single Resistor for Stop Current Set Point
Single Resistor for Tail Dimming Set Point
Overvoltage & Overtemperature Set Back Power
Limitation
AEC Q100 Qualified
16 Lead SOW Exposed Pad
Lead−free Packaging
•
Output
Soft Start Eliminates EMI Concerns
Low Dropout Operation for Pre−Regulator Applications
External Modulation Capable
•
Tail Input Switch − Outputs are in the PWM Mode
STOP Input Switch − Outputs are 100% On
DIAG Output − Open Circuits are Reported
LED Isolation − On−board LEDs can be Removed with
Jumpers for Alternative LED Evaluation
STOP Programming Current − Programming Resistor
can be Adjusted Externally by Jumper Removal
Tail Programming Duty Cycle − Programming Resistor
can be Adjusted Externally by Jumper Removal
Figure 1. NCV7680EVB Photo
© Semiconductor Components Industries, LLC, 2010
August, 2010 − Rev. 3
1
Publication Order Number:
NCV7680EVB/D
2
A
2
R1
10K
1
SW SPST
SW3
UP = No FET, Resistor in series with FB to VP
Down = FET with FB resistors to VP.
Physical board layout left= Down & right=UP
TP10
GND
TP8
GND
TP7
DIAG
J9
TP5
SI_TP
J10
SW SPST
C3
10 nF
R2
10K
MRA4003
MRA4003
D26
2.21K
R4
R3
R8
1K
3.09K
OUT4
OUT3
OUT2
OUT1
VP
SW 3PDT
2
2
VP
J12
J11
FB
Ballast Drive
SW1
C2
1uF
J15
HEADER 10
J16
1
1
2
1
R6
1K
1
2
3
4
5
6
7
8
FB
TP6
OUT1
VP
Ballast Drive
FB
STOP
DIAG
RSTOP
RTAIL
U1EPAD
C4
0.22uF
U2
1K
1
OUT5
OUT6
OUT7
OUT8
NCV7680
OUT2
OUT3
OUT4
GND
OUT5
OUT6
OUT7
OUT8
R7
8.87K
J14
16
15
14
13
12
11
10
9
OUT1
J1
C1
1uF
2
OUT3
J3
LED
D6
LED
D5
LED
D4
OUT4
J4
LED
D9
LED
D8
LED
D7
OUT5
J5
LED
D12
LED
D11
LED
D10
OUT6
J6
LED
D15
LED
D14
LED
D13
Date:
Size
A
Title
Wednesday, December 09, 2009
Document Number
<Doc>
NCV7680_demoboard_new_pinout_rev_B
Jumpers 1-8, Enable the customer to put their own LEDs between VP and OUTx.
Jumper 9, Switches pull up in and out for DIAG.
Jumper 10, Allows easy connection to one supply for Tail and STOP.
Jumper 11, RSTOP programming node.
Jumper 12, RTAIL programming node.
Jumper 13, Boost Regulator connection node.
Jumper 14, Loss of ground testing and NCV3065 testing.
Jumper 15, in series with VP pin.
OUT2
J2
LED
D3
LED
D2
LED
D1
2
1
J13
2
1
R5
NTD2955
1
2
1
D25
VP
2
1
TP4
STOP_Input
2
1
TP1
Diode_OR
2
Sheet
1
SW2
TP9
TI_TP
1
2
1
2
OUT7
J7
LED
D18
LED
D17
LED
D16
2
1
1
TP3
Tail_Input
17
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1
2
3
4
5
6
7
8
9
10
Figure 2. NCV7680EVB Schematic
1
of
OUT8
J8
LED
D21
LED
D20
LED
D19
2
1
TP2
VP
1
Rev
C
LED
D24
LED
D23
LED
D22
A
NCV7680EVB/D
NCV7680EVB/D
Powering up the Board
2. Position switch 1 (SW1) for either external ballast
connection (left) or no external ballast connection
(right).
3. Connect the power supply.
4. Toggle switch 2 (SW2) for display of the PWM
mode (tail).
5. Toggle switch 3 (SW3) for display of 100% duty
cycle (STOP).
Equipment Needed − 1 power supply (3/4 Amp)
1. There are 15 jumpers on the board. Start with all
15 jumpers connected. Jumper locations are shown
in Figure 3. A list of jumper functionality is shown
in the board schematic (Figure 2).
Typical connections to the evaluation board are
shown in Figure 4.
Figure 4. Power Connections
Figure 3. Jumper Locations
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NCV7680EVB/D
Jumpers 1−8
Jumpers 1−8 highlight the open circuit functionality of diagnostic pin (DIAG).
Monitor DIAG while creating an open circuit by removing any on these jumpers (1−8).
DIAG functionality will conform to the variables shown in Table 1.
Table 1. DIAG Functionality
Stop Input
Tail Input
OUTX Current
1−8
Fault State
DIAG State
0
0
OFF
−
HighZ*
1
0
ISTOP
Normal
Low
1
0
ISTOP
Open String
High*
0
1
PWM
Don’t Care
High*
1
1
ISTOP
Normal
Low
1
1
ISTOP
Open String
High*
Figure 5. Open Circuit Testing
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NCV7680EVB/D
Jumper 9
Figure 6 shows the test setup for using DIAG with a
separate supply.
Jumper 9 disconnects the PC board pullup resistor and
allows the user to interface with his own component and
power supply to the DIAG pin.
Disconnect Jumper 9. Connect the external resistor to a
separate supply. The DIAG pin is limited to 45 V per the
maximum ratings table.
MAXIMUM RATINGS (Voltages are with respect to device substrate)
Rating
Value
Unit
VP, Ballast Drive, STOP, DIAG
DC
Peak Transient
−0.3 to 45
45
Output Pin Voltage (OUTX)
−0.3 to 45
V
Output Pin Current (OUTX)
100
mA
−0.3 to 5
V
−40 to 150
°C
260 peak
°C
Input Voltage (RTAIL, RSTOP, FB)
Junction Temperature, TJ
Peak Reflow Soldering Temperature: Pb−Free
60 to 150 seconds at 217°C (Note NO TAG)
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. DIAG is tested under the conditions shown below from the NCV7680 datasheet.
ELECTRICAL CHARACTERISTICS
(6 V < VP < 16 V, V, STOP = VP, RSTOP = 3.09 kW, RTAIL = 2.21 kW, −40°C ≤ TJ ≤ 150°C, unless otherwise noted.)
Characteristic
Min
Typ
Max
Unit
DIAG OUTPUT
Output Low Voltage
DIAG Active, IDIAG = 1 mA
−
0.1
0.4
V
Output Leakage Current
VDIAG = 5 V
−
−
10
mA
Figure 6. DIAG Connection
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NCV7680EVB/D
Jumper 10
After removing jumper 10, connect 2 power supplies as
shown in Figure 7.
Using jumper 10 allows the use of one power supply for
both the Tail and STOP functions. Removing J10 allows the
use of separate supplies for the Tail Input and the STOP
Input.
Figure 7.
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NCV7680EVB/D
Jumpers 11 and 12
Jumpers 11 and 12 allow the user to program the LED output currents.
Remove the jumper to disconnect the PC board resistor and connect a different value.
Resistor values and resultant output programmed currents can be calculated using these design equations.
OUTX + 100
R STOP_BIAS_Voltage
R STOP
R TAIL + 4
(eq. 1)
R STOP_BIAS_Voltage + 1.08 V (typ)
Figure 8. Programming Resistors
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7
R STOP
(DC ) 0.1)
(eq. 2)
NCV7680EVB/D
Jumper 13
on the board edge. Figure 10 highlights an alternative
connection. Note, two channels are shown in Figure 10
disconnecting jumpers 1, 2, and 13. This can be expanded
for all 8 channels.
Jumper 13 disconnects the common top anode connection
of the LED’s.
When used with jumpers 1−8 allows the user to drive
external LED’s. Figure 9 highlights using the connections
Figure 9. External LED’s
Figure 10. External LED’s (alt. connection)
(two channels shown)
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NCV7680EVB/D
Isolation of VP using jumper 13 will also allow the use of
a boost converter to add additional headroom for more LEDs
in a string. See Figure 11 for setup.
Figure 11. Voltage Boost
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NCV7680EVB/D
Jumper 14
Jumper 14 is the ground connection for the NCV7680. This can be used to measure ground current of the IC or test for loss
of ground conditions.
Jumper 15
Jumper 15 is a series connection for VP. This can be used to measure the quiescent current of the NCV7680. Remove jumper
15 and put an ammeter between the pins of the jumper.
BILL OF MATERIALS (NCV7680 Demonstration Board)
Designator
Qty
Description
Value
Tolerance
Footprint
Manufacturer
Manufacturer
Part Number
Substitution
Allowed
Pb−Free
U1
1
NCV7680
(SOW−16
epad)
−
−
751R_02_B
ON Semiconductor
NCV7680PDWG
No
Yes
U2
1
NTD2955
−
−
DPAK3_SMD
ON Semiconductor
NTD2955T4G
No
Yes
U3, (D25,
D26)
2
MRA4003
−
−
SMA_DIODE
ON Semiconductor
MRA4003T3G
No
Yes
D1−D24
24
Superflux
LED
(Lumileds)
Amber
N/A
LED_SUPERFLUX
Philips
HPWN−BL00−0002
No
Yes
C1,C2
2
Input /
Output
Capacitor
1mF,
50V
("10%)
X7R
1210
KEMET
C1210C105K3RACTU
Yes
Yes
C3
1
Debounce
Capacitor
10nF,
50V
("10%)
X7R
0805
AVX
08055C103KAT
Yes
Yes
C4
1
Loop
Stabization
Capacitor
0.22mF,
50V
("10%)
X7R
0805
Murata
GCM21BR71H224KA37L
Yes
Yes
R1, R2
2
Logic I/O
Resistor
10k
1%
0805
Yageo America
RC0805FR−0710KL
Yes
Yes
R3
1
Stop Current
Program
Resistor
3.09k
1%
0805
Yageo America
RC0805FR−073K09L
Yes
Yes
R4
1
Tail Current
Program
Resistor
2.21k
1%
0805
Yageo America
RC0805FR−072K21L
Yes
Yes
R7
1
VP Program
Resistor
8.87k
1%
0805
Yageo America
RC0805FR−078K87L
Yes
Yes
R5, R6, R8
3
VP Support
Resistor
1k
1%
0805
Yageo America
RC0805FR−071KL
Yes
Yes
J16
1
Jumper
Posts (SIP
10),
100mill
spacing
−
−
SIP10
Molex−Waldom
Electronics Corp
22−28−4103
Yes
Yes
J1−J15
30
Jumper
Posts
100 mil
spacing
−
−
JMP
Molex−Waldom
Electronics Corp
22−28−4023
Yes
Yes
J1−J15
15
Jumper
−
−
−
Sullins Electronic Corp
SSC02SYAN
Yes
Yes
TP1−TP10
10
Connector
Posts
−
−
TURRET
Vector Electronics
K24C/M
Yes
Yes
SW1
1
Ballast FET
enable
switch
(3PDT)
−
−
NKK_3PDT_M2032
NKK of America
M2032SS1W03−RO
Yes
Yes
SW2, SW3
2
STOP / Tail
control
switch
(SPDT)
−
−
C&K_7101
C&K
7101SYCQE
Yes
Yes
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NCV7680EVB/D
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are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
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NCV7680EVB/D