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| 型号： | NCV7680PWR2GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO REAR COMBO LAMP |
| 标准包装： | 1 |
| 系列： | * |
NCV7680
DETAILED OPERATING DESCRIPTION
General
The NCV7680 consists of eight linear programmable
constant current sources. The part is designed for use in the
regulation and control of LED based Rear Combination
Lamps for automotive applications. System design with the
NCV7680 allows for two brightness levels; one for stop, and
one for tail illumination.
Brightness levels are easily programmed (stop current
absolute value, tail current duty cycle value) with two
reduced resulting in lower power dissipation on the IC. This
occurs during high battery voltage (V P > 16 V). In this way
the NCV7680 can operate in extreme conditions and still
provide a controlled level of light output
The Overvoltage condition is reported on the DIAG Pin.
Reference Figures 19 and 20 for Power Limiting Behavior.
Only Voltage Effects
external resistors.
The use of an external FET allows for power distribution
on designs requiring high currents. Additionally, set back
power limit reduces the drive current during overvoltage
conditions. Set back power limit is most useful for low
current applications when no external FET is used.
Low Drop ? out
Area
Constant Current Area
Overvoltage
Set Back
Area
Thermal
Shutdown
180 ° C (typ)
The NCV7680 offers all of the built in protection normal
to regulator systems, such as current limit, thermal limit, and
provides an open load diagnostic that coincides with the
STOP input signal.
Figure 19. Ballast FET Power
Voltage
Open String Reporting (DIAG)
Open string detection is reported on the DIAG pin as a
high with STOP Input high, or a combination of STOP Input
Low Drop ? out
Area
Only Voltage Effects
high and TAIL Input high. Reference Table 1 on page 5 for
more details. Open circuit is sensed on each of the 8 outputs.
Constant Current Area
Overvoltage
Set Back
Area
Thermal
Shutdown
180 ° C (typ)
The typical threshold voltage for detection is 0.4 V. Care
must be taken not to breach this voltage level under normal
Figure 20. IC Power
Voltage
operation , or a false open will be reported. Make sure worst
case system design focuses on the voltage level on top of the
LED string (top anode) (V STRING ) and includes the worst
case LED voltage drop while considering temperature
effects.
Input Voltage and Set Back Current
Automotive battery systems have wide variations in line
supply voltage. Low dropout is a key attribute for providing
consistent LED light output at low line voltage. Unlike
adjustable regulator based constant current source schemes
where the set point resistor resides in the load path, the
NCV7680’s set point resistor lies outside the LED load path,
and aids in the low dropout capability.
Setback Current Limit is employed during high voltage.
During a Setback Current Limit event, the drive current is
Quiescent Current Power
Further reduction in power to the NCV7680 can be
achieved by moving the V P pin connection to the drain of the
external FET. The contribution of power at the NCV7680
caused by the quiescent current into V P is lowered due to the
lower operating voltage of V P with the new connection.
Note also the addition of an external resistor Rsd in Figure
21. This will be required to insure startup of the system. A
value for Rsd should be chosen low enough to provide
current into V P and the current in the I LEDs & feedback string
under all required input voltage input conditions. Rsd’s
value should be chosen lower for slow rising V bat signals to
avoid switching between an Output Disable state and an
Open Circuit state during power ? up.
http://onsemi.com
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| NCV7701 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2.0 Amp H-Bridge Driver |
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| NCV7701DW | 功能描述:IC DRIVER H-BRIDGE 2A 20SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 内部开关 系列:- 标准包装:1,000 系列:- 类型:高端/低端驱动器 输入类型:SPI 输出数:8 导通状态电阻:850 毫欧，1.6 欧姆 电流 - 输出 / 通道:205mA，410mA 电流 - 峰值输出:500mA，1A 电源电压:9 V ~ 16 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:PG-DSO-20-45 包装:带卷 (TR) |
| NCV7701DWR2 | 功能描述:IC DRIVER H-BRIDGE 2A 20SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 内部开关 系列:- 标准包装:1,000 系列:- 类型:高端/低端驱动器 输入类型:SPI 输出数:8 导通状态电阻:850 毫欧，1.6 欧姆 电流 - 输出 / 通道:205mA，410mA 电流 - 峰值输出:500mA，1A 电源电压:9 V ~ 16 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:PG-DSO-20-45 包装:带卷 (TR) |
| NCV7701DWR2G | 制造商:ON Semiconductor 功能描述:MOSFET DRVR 1A DUAL LO SIDE H BRDG 20SOIC - Tape and Reel |
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