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参数资料
| 型号： | NCP5608EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5608 |
| 设计资源： | NCP5608EVB BOM NCP5608EVB Gerber Files NCP5608EVB Schematic NCP5608 Demo Brd BOM |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 500mA |
| 输出及类型： | 8，非隔离 |
| 输出电压： | 4.8 ~ 5.5 V |
| 特点： | 亮度控制 |
| 输入电压： | 3.6V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5608 |
| 其它名称： | NCP5608EVBOS |
NCP5608
APPLICATIONS INFORMATION
DC?DC OPERATION
The converter is based on a charge pump technique to
generate a DC voltage capable to supply the white LED
load. The system regulates the current flowing into each
LED by means of internal current mirrors associated with
the white diodes. Consequently, the output voltage will be
equal to the Vf of the LED, plus the 300 mV (typical)
developed across the internal NMOS mirror. Typically,
assuming a standard white LED forward biased at 10 mA,
the output voltage will be 3.2 V.
The third external capacitor makes possible the 1.33X
extra mode of operation, with a significant efficiency
improvement of the converter over the normal battery
voltage span. The threshold levels have been defined to
optimize this range of operating voltages, assuming a high
efficiency is not relevant when the system is connected to
a battery charger (i.e. Vbat > 4.5 V).
The built?in OVP circuit continuously monitors each
output and stops the converter when the voltage is above
Li?Ion
2.90 V ? 4.10 V
PIN 19
GND
5.0 V. The converter resumes normal operation when the
voltage drops below 5.0 V (no latch?up mechanism).
Consequently, the chip can operate with no load during any
test procedures, but in the case of special applications, it is
recommended to connect the unused LED driver either to
the V OUT supply to avoid any uncontrolled operation.
The structure is built with power MOS devices to
accommodate the modes selected by the analog functions.
The current flowing into each LED is continuously
regulated according to the value defined by the
programming message. The total current is limited to
500 mA DC.
The system runs with two cycles:
? Cycle#1
Fly capacitors are charged from the battery.
? Cycle#2
Energy accumulated into the fly capacitors is
transferred to the load.
Q1
Q3
Q6
Q7
Q10
Q11
C1N
C1
C1P
Q5
C2N
C2
C2P
Q9
C3N
C3
C3P
PIN 16
Q2
PIN 17
Q4
PIN 20
PIN 21
Q8
PIN 23
PIN 22
Q12
V OUT
CURRENT CONTROL
LEDx
PIN 18
GND
PWRGND
PIN 13
GND
Figure 3. Basic DC?DC NCP5608 Converter Structure
http://onsemi.com
7
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