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参数资料
| 型号： | NCV7680PWR2GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/20页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO REAR COMBO LAMP |
| 标准包装： | 1 |
| 系列： | * |
NCV7680
Latch ? Off on Open String Detection
Some LED lighting systems require the complete lighting
system to shut down when the output intensity has
diminished. This eliminates a slow degradation of output
illumination. Figure 28 provides one solution for this
requirement. The open circuit fault information provided on
the DIAG pin coupled with external discrete transistors
provides the feedback needed to the FB pin to turn off the
ballast transistor drive removing the LED anode string from
any power source. This condition is held until the input
signal is toggled.
TAIL Input
MRA4003T3G
STOP Input
MRA4003T3G
C1
0.1uF
NTD2955G
R3 C2
1k 0.22uF
C3
100nF
V STRING
MRA4003T3G
R1
10k
OUT1
NCV7680
OUT2
VP
Ballast Drive
OUT3
OUT4
C4
10nF
R10
10k
R11
10k
R9, 499
MUN2111LT1G
R2
R4, 3.09k
R5, 2.21k
FB
STOP
DIAG
RSTOP
RTAIL
GND
OUT5
OUT6
OUT7
OUT8
MUN2211
4.99k
C6
0.1uF
R6
8.87K
V ref
R7
1K
Note: Latch ? off will be implemented under all conditions which cause DIAG to go high.
Reference the pin function description table for a summary of DIAG performance.
Figure 28. Latch ? Off Circuit
x% reduction
20
VP(@20% reduction) max + V ) 24.5 V + 29.5 V
Checking DIAG After Assembly
Production requirements often require the functional
testing of all parameters in a system. This can be a difficult
parameter to check if the function is exercising the DIAG
pin. You cannot easily create an open circuit condition to
check on the reporting capability of the DIAG pin. This
would require you to remove one or all LEDs in a string.
As an alternative you can use the Set Back Current Limit
function of the device. Increasing the voltage to the VP pin
(STOP mode) will cause the current through the LEDs to
decrease. Because DIAG also reports when the current limit
has decreased 20%, we can calculate the minimum voltage
needed to create that condition.
The Voltage Fold-Back equation is:
(eq. 6)
VP@(x% reduction) + ) VP(1% reduction)
kv
Using the electrical parameters in the datasheet, we have:
(x% reduction)=20, kv=4%min(@20% reduction), VP(1%
reduction)max=24.5V.
(eq. 7)
4
This is the maximum worst case voltage the NCV7680
will toggle the DIAG pin at VP. An additional increase in
voltage should be used for good engineering judgment here.
A supply voltage of 32V is recommended. Note the
maximum capability of the VP and DIAG pins is 45V.
An alternative to supplying the higher voltage on VP to
toggle DIAG requires the short the Rstop pin to ground
(must be less than 0.5 V).
Note the Rstop pin is self-protected as per Figure 18 Iout
vs. Irstop.
Where kv= %/V
http://onsemi.com
19
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