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| 型号： | NCP3065PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HP CONST CURR 8-DIP |
| 标准包装： | 50 |
| 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： | 250kHz |
| 电源电压： | 3 V ~ 40 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1120 (CN2011-ZH PDF) |
| 其它名称： | NCP3065PGOS |
NCP3065, NCV3065
APPLICATIONS
Figures 16 through 24 show the simplicity and flexibility
of the NCP3065. Two main converter topologies are
demonstrated with actual test data shown below each of the
circuit diagrams.
Figure 16 gives the relevant design equations for the key
parameters. Additionally, a complete application design aid
for the NCP3065 can be found at www.onsemi.com.
(See Notes 8, 9, 10)
ton
toff
t on
Step ? Down
Vout ) VF
Vin * VSWCE * Vout
ton
toff
Step ? Up
Vout ) VF * Vin
Vin * VSWCE
ton
toff
CT + 381.6 @ 10
C T
f
ton
toff
) 1
fosc
* 6
* 343 @ 10 * 12
f
ton
toff
) 1
I L(avg)
Iout
Iout
ton
toff
) 1
I pk (Switch)
IL(avg) )
D IL
2
IL(avg) )
D IL
2
R SC
0.20
Ipk (Switch)
0.20
Ipk (Switch)
L
Vin * VSWCE * Vout
D IL
ton
Vin * VSWCE
D IL
ton
V ripple(pp)
D IL
1
8 f CO
2
) (ESR) 2
[
ton Iout
CO
) D IL @ ESR
V out
VTH
R2
R1
) 1
VTH
R2
R1
) 1
I out
V ref R sense
V ref R sense
8. V SWCE ? Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 7, 8, 9 and 10.
9. V F ? Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V.
10. The calculated t on /t off must not exceed the minimum guaranteed oscillator charge to discharge ratio.
Figure 16. Design Equations
The Following Converter Characteristics Must Be Chosen:
V in ? Nominal operating input voltage.
V out ? Desired output voltage.
I out ? Desired output current.
D I L ? Desired peak ? to ? peak inductor ripple current. For maximum output current it is suggested that D I L be chosen to be
less than 10% of the average inductor current I L(avg) . This will help prevent I pk (Switch) from reaching the current limit threshold
set by R SC . If the design goal is to use a minimum inductance value, let D I L = 2(I L(avg) ). This will proportionally reduce
converter output current capability.
f ? Maximum output switch frequency.
V ripple(pp) ? Desired peak ? to ? peak output ripple voltage. For best performance the ripple voltage should be kept to a low
value since it will directly affect line and load regulation. Capacitor C O should be a low equivalent series resistance (ESR)
electrolytic designed for switching regulator applications.
http://onsemi.com
9
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| NCP3065PG | 制造商:ON Semiconductor 功能描述:IC VOLTAGE REGULATOR |
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