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| 型号： | NCP5604AAGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5604AAG |
| 产品变化通告： | Product Obsolescence 30/Jun/2011 |
| 设计资源： | NCP5604A EVB BOM NCP5604AAGEVB Gerber Files NCP5604 EVB Schematic NCP5604 Demo Brd BOM |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 100mA |
| 输出及类型： | 4，非隔离 |
| 输出电压： | 4.8 ~ 6 V |
| 特点： | 通-断开关 |
| 输入电压： | 2.85 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5604 |
| 其它名称： | NCP5604AAGEVBOS |
NCP5604A, NCP5604B
Vbat
220 nF/10 V
Input PWM Signal Frequency:
100 Hz to 200 kHz
GND
C4
C3
1
VBAT
C2P
4.7uF/6.3V
1
VBAT
C2N
14
U1
CONTROL
GND
R1
100k
2
3
4
EN
IREF NCP5604B
AGND
C2P
C1P
13
11
C2
220 nF/10 V
C1
PWM
2
3
EN
IREF
C2N
C3P
9
PGND
C1N
VOUT
10
12
220 nF/10 V
C3N
D2
D1
LWY87S
C5
GND
4
9
AGND
PGND
VOUT
D3
LWY87S
LWY87S
GND
GND
Figure 9. Using the NCP5604B to Drive a Three LED
Figure 11. Basic Digital PWM Dimming Control
Layout
The PWM frequency can be up to 200 kHz once the
Finally, an external network can be connected across
Vout and ground, but the current through such network will
not be regulated by the NCP5604A chip (see Figure 10).
On top of that, the total current out of the Vout pin shall be
limited to 100 mA.
circuit has been properly started. On the other hand, with
a 1% to 99% span, the circuit supports a large Duty Cycle
to accommodate any range of dimming. The waveforms
given in Figure 12 illustrate the NCP5604A behavior
during the 50 kHz PWM operation. The same mechanism
applies for the NCP5604B version.
GND
C5
1 m F/6.3 V
12
8
7
6
5
GND
Figure 10. Extra Load Connected to Vout
DIMMING
The dimming can be achieved by two means:
? Use a digital PWM signal to control the EN pin
? Use an analog signal to control the reference current
IREF pin.
The digital PWM is straightforward, yielding a zero to
100% duty cycle, but the output current is pulsed since the
system is continuously switched ON/OFF. There is no need
for extra passive component, the clock being provided by
an I/O port from the MCU (see Figure 11).
Figure 12. PWM Modulation Span: 1% to 99%
Besides the popular PWM mode, a simple analog
technique can be built with two extra components (one
resistor + one NMOS), the net advantage being a
continuous output current once the operating point has
been stabilized (see Figure 13). The absolute output
current tolerance depends upon the precision of the two
external resistors, the R DS(on) of the NMOS being
negligible in front of the resistor value. The example given,
Figure 13 yields a 1.0 mA output current when Q1 is OFF,
http://onsemi.com
10
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相关代理商/技术参数 |
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|---|---|
| NCP5604AMTR2G | 功能描述:LED照明驱动器 ANA LED DRIVER RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| NCP5604B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Efficiency White LED Driver |
| NCP5604BMTR2G | 功能描述:LED照明驱动器 ANA LED DRIVER RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| NCP5604D WAF | 制造商:ON Semiconductor 功能描述: |
| NCP5608 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Multiple LED Charge Pump Driver |
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