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参数资料
| 型号： | NCV3066DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT 8-SOIC |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 100kHz ~ 250kHz |
| 电源电压： | 3 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
NCP3066, NCV3066
INTRODUCTION
The NCP3066 is a monolithic power switching regulator
optimized for LED Driver applications. Its flexible
architecture enables the system designer to directly
implement step ? up, step ? down, and voltage ? inverting
converters with a minimum number of external components
for driving LEDs. A representative block diagram is shown
in Figure 3.
Operating Description
The NCP3066 operates as a fixed oscillator frequency
output voltage ripple gated regulator. In general, this mode
of operation is somewhat analogous to a capacitor charge
pump and does not require dominant pole loop
compensation for converter stability. The typical operating
waveforms are shown in Figure 12. The output voltage
waveform is shown for a step ? down converter with the
ripple and phasing exaggerated for clarity. During initial
converter startup, the feedback comparator senses that the
output voltage level is below nominal. This causes the
output switch to turn on and off at a frequency and duty cycle
controlled by the oscillator, thus pumping up the output filter
comparator value, the output switch cycle is inhibited. When
the load current causes the output voltage to fall below the
nominal value feedback comparator enables switching
immediately. Under these conditions, the output switch
conduction can be enabled for a partial oscillator cycle, a
partial cycle plus a complete cycle, multiple cycles, or a
partial cycle plus multiple cycles.
Oscillator
The oscillator frequency and off ? time of the output switch
are programmed by the value of the timing capacitor C T . The
capacitor C T is charged and discharged by a 1 to 6 ratio
internal current source and sink, generating a positive going
sawtooth waveform at Pin 3. This ratio sets the maximum
t ON /(t ON + t OFF ) of the switching converter as 6/(6+1) or
85.7% (typical). The oscillator peak and valley voltage
difference is 500 mV typically. To calculate the C T capacitor
value for required oscillator frequency, use the equations
found in Figure 15. An online NCP3066 design tool can be
found at www.onsemi.com, which aids in selecting
component values.
capacitor. When the output voltage level reaches nominal
Figure 12. Typical Operating Waveforms
http://onsemi.com
7
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