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参数资料
| 型号： | NCP5006EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5006 |
| 设计资源： | NCP5006 Demo Board BOM NCP5006EVB Gerber Files NCP5006 Demo Board Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 15mA |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 22V |
| 输入电压： | 3.6V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5006 |
| 其它名称： | NCP5006EVBOS |
NCP5006
Basically, the chip operates with two cycles:
Cycle #1: time t1, the energy is stored into the inductor
Cycle #2: time t2, the energy is dumped to the load
The POR signal sets the flip?flop and the first cycle takes
place. When the current hits the peak value, defined by the
First Start?Up
I L
error amplifier associated to the loop regulation, the
flip?flop resets, the NMOS is deactivated and the current
is dumped into the load. Since the timings depend on the
environment, the internal timer limits the toff cycle to
320 ns (typical), making sure the system operates in a
continuous mode to maximize the energy transfer.
Normal Operation
Ipeak
Iv
0 mA
t1
t2
t
Ids
0 mA
Io
0 mA
Figure 4. Basic DC?DC Operation
t
t
Based on the data sheet, the current flowing into the
inductor is bounded by two limits:
? Ipeak Value: Internally fixed to 350 mA typical
? Iv Value: Limited by the fixed Toff time built in the
chip (320 ns typical)
The system operates in a continuous mode as depicted in
Figure 4 and t 1 and t 2 times can be derived from basic
to avoid saturation of the core. On top of that, the ferrite
material shall be capable to operate at high frequency
(1.0 MHz) to minimize the Foucault’s losses developed
during the cycles.
The operating frequency can be derived from the
electrical parameters. Let V = Vo ? V bat , rearranging
Equation 1:
ton + dI * L
equations. (Note: The equations are for theoretical analysis
only, they do not include the losses.)
E
(eq. 5)
L + E * dI
Let V bat = E, then:
dt
(eq. 1)
Since toff is nearly constant (according to the 320 ns
typical time), the dI is constant for a given load and
inductance value. Rearranging Equation 5 yields:
*L
t1 +
(Ip * Iv) * L
Vbat
(eq. 2)
ton +
V*dt
L
E
(eq. 6)
t2 +
(Ip * Iv) * L
Vo * Vbat
(Vopk * Vbat) * dt
ton +
(eq. 3)
Since t 2 = 320 ns typical and Vo = 21 V maximum, then
(assuming a typical V bat = 3.0 V):
Let E = V bat , and Vopk = output peak voltage, then:
(eq. 7)
Vbat
Finally, the operating frequency is:
f +
1
ton ) toff
D I +
t2 * (Vo * Vbat)
L
(eq. 4)
(eq. 8)
The output power supplied by the NCP5006 is limited to
D Imax +
320 ns * (21?3.0)
22 m H
+ 261 mA
one watt: Figure 5 shows the maximum power that can be
delivered by the chip as a function of the output voltage.
Of course, from a practical stand point, the inductor must
be sized to cope with the peak current present in the circuit
http://onsemi.com
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5006SNT1 | 功能描述:LED照明驱动器 White LED Backlight 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 |
| NCP5006SNT1G | 功能描述:LED照明驱动器 White LED Backlight Boost 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 |
| NCP5007 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Compact Backlight LED Boost Driver |
| NCP5007/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Compact Backlight LED Boost Driver |
| NCP5007_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Compact Backlight LED Boost Driver |
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