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参数资料
| 型号： | NCV7680PWR22GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION NCV7680 |
| 设计资源： | NCV7680PWR22GEVB Schematic NCV7680EVB/D BOM NCV7680PWR22GEVB Gerber Files |
| 标准包装： | 1 |
| 输出及类型： | 8，非隔离 |
| 特点： | PWM 亮度控制 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCV7680 |
| 其它名称： | NCV7680PWR22GEVBOS |
NCV7680
Rsd
V bat
MRA4003T3G
NTD2955
I LEDs &
feedback
C1
0.1 m F
R3
1K
C2
0.22 m F
C3
100 nF
OUT1
NCV7680
OUT2
V P
Ballast Drive
FB
STOP
DIAG
R STOP
R TAIL
Figure 21. Alternative V P Connection with Rsd
OUT3
OUT4
GND
OUT5
OUT6
OUT7
OUT8
Programmability
Strings of LEDs are a common configuration for RCL
applications. The NCV7680 provides eight matched outputs
allowing individual string drive with current set by a single
Alternatively, the equations below can be used to calculate
a typical value and used for worst case analysis.
Set the Stop Current using R STOP
R STOP_Bias_Voltage
R STOP
resistor. Individual string drive is a benefit to ensure equal
current distribution amongst all of the strings. Output
currents are mirrored and matched within ± 5% at hot
temperature.
OUTX + 100
R STOP Bias Voltage = 1.08 V (typ)
(eq. 1)
R TAIL + m
R STOP (DC ) 0.1)
I RTAIL
I RSTOP
A high STOP condition sets the output current using
equation 1 below.
A low STOP condition, modulates the output currents at
a duty cycle (DC) programmed using equation 2 below.
Note, current limiting on R STOP limits the current which
can be referenced from the RSTOP Pin. Exceeding the
R STOP Current Limit will reduce the output current and the
DIAG Pin will go high (reference Figure 18). This helps
limit output current (brightness and power) for this type of
fault.
The average I STOP Duty Cycle current provides the
dimmed tail illumination function and assures a fixed
brightness level for tail. The PWM generator ’s fixed
frequency (1 kHz typ.) oscillator allows flicker ? free
illumination. PWM control is the preferred method for
dimming LEDs.
The diagnostic function allows the detection of an open in
any one of the output circuits. The active ? low diagnostic
output (DIAG) is coincident with the STOP input. DIAG
remains high (pulled up) if an open load is detected in any
LED string when STOP is high.
Output Current Programming
Reference Figure 10 to choose programming resistor
(R STOP ) value for stop current. Reference Figure 12 (Duty
Cycle vs. R TAIL ) to choose a typical value programming
resistor for output duty cycle (with a typical R STOP value of
3.09 k W ). Note the duty cycle is dependent on both R STOP
and R TAIL values. R STOP should always be chosen first as the
stop current is only dependent on this value.
Set the Duty Cycle (DC) using R TAIL
4 (eq. 2)
DC = duty cycle expressed in fractional form.
(e.g. 0.50 is equivalent to 50% duty cycle)
m = 1.16 = Mirror Coupling Ratio =
(ground R TAIL when using external modulation)
Output Current is directly tested per the electrical
parameter table to be ± 10% (with R STOP = 3.09 k W ) or
31.5 mA (min), 35 mA (typ), 38.5 mA (max) at room and hot
temperature.
Duty Cycle will vary according to the changes in R TAIL
Voltage and R TAIL Bias Current (generated form the current
through R STOP ).
Voltage errors encompass generator errors (0.4 V to 4.4 V)
and comparator errors and are included in testing as the Duty
Cycle. Typical duty cycle measurements are 5% with R TAIL
= 0.59 V and 70% with R TAIL = 3.29 V.
R TAIL Bias Current errors are measured as R TAIL Bias
Current and vary as 300 m A (min), 350 m A (typ), and 450 m A
(max) with R STOP = 3.09 k W .
The error duality and choice of duty cycle levels make it
difficult to specify duty cycle minimum and maximum
limits, but worst case conditions can be calculated when
considering the variation in the voltage threshold and
current source. Duty Cycle variation must include the direct
duty cycle as specified in the electrical parameter table plus
an additional error due to the Irstop current which generates
this voltage in the system.
http://onsemi.com
13
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