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| 型号： | NCP6334BMTAATBG |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 8-WDFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-WDFN（2x2） |
| 其它名称： | NCP6334BMTAATBGOSDKR |
NCP6334B, NCP6334C
APPLICATION INFORMATION
f LC +
V IN * V OUT @ V OUT
L +
I L_PP
I L_MAX + I OUT_MAX )
Output Filter Design Considerations
The output filter introduces a double pole in the system at
a frequency of
1
(eq. 2)
2 @ p @ L @ C
The internal compensation network design of the
NCP6334B/C is optimized for the typical output filter
comprised of a 1.0 m H inductor and a 10 m F ceramic output
capacitor, which has a double pole frequency at about
50 kHz. Other possible output filter combinations may have
a double pole around 50 kHz to have optimum operation
with the typical feedback network. Normal selection range
of the inductor is from 0.47 m H to 4.7 m H, and normal
selection range of the output capacitor is from 4.7 m F to
22 m F.
Inductor Selection
The inductance of the inductor is determined by given
to 50% of the maximum output current IOUT_MAX for a
trade ? off between transient response and output ripple. The
inductance corresponding to the given current ripple is
(eq. 3)
V IN @ f SW @ I L_PP
The selected inductor must have high enough saturation
current rating to be higher than the maximum peak current
that is
(eq. 4)
2
The inductor also needs to have high enough current
rating based on temperature rise concern. Low DCR is good
for efficiency improvement and temperature rise reduction.
Table 1 shows some recommended inductors for high power
applications and Table 2 shows some recommended
inductors for low power applications.
peak ? to ? peak ripple current IL_PP of approximately 20%
Table 1. LIST OF RECOMMENDE D INDUCTORS FOR HIGH POWER APPLICATIONS
Case Size
Rated Current (mA)
Manufacturer
MURATA
MURATA
MURATA
Part Number
LQH44PN2R2MP0
LQH44PN1R0NP0
LQH32PNR47NNP0
(mm)
4.0 x 4.0 x 1.8
4.0 x 4.0 x 1.8
3.0 x 2.5 x 1.7
L ( m H)
2.2
1.0
0.47
(Inductance Drop)
2500 ( ? 30%)
2950 ( ? 30%)
3400 ( ? 30%)
Structure
Wire Wound
Wire Wound
Wire Wound
Table 2. LIST OF RECOMMENDE D INDUCTORS FOR LOW POWER APPLICATIONS
Case Size
Rated Current (mA)
Manufacturer
MURATA
MURATA
TDK
TDK
Part Number
LQH44PN2R2MJ0
LQH44PN1R0NJ0
VLS201612ET ? 2R2
VLS201612ET ? 1R0
(mm)
4.0 x 4.0 x 1.1
4.0 x 4.0 x 1.1
2.0 x 1.6 x 1.2
2.0 x 1.6 x 1.2
L ( m H)
2.2
1.0
2.2
1.0
(Inductance Drop)
1320 ( ? 30%)
2000 ( ? 30%)
1150 ( ? 30%)
1650 ( ? 30%)
Structure
Wire Wound
Wire Wound
Wire Wound
Wire Wound
V OUT_PP(C) +
Output Capacitor Selection
The output capacitor selection is determined by output
voltage ripple and load transient response requirement. For
a given peak ? to ? peak ripple current IL_PP in the inductor
of the output filter, the output voltage ripple across the
output capacitor is the sum of three ripple components as
below.
operation mode, the three ripple components can be
obtained by
I L_PP
(eq. 6)
8 @ C @ f SW
V OUT_PP(ESR) + I L_PP @ ESR (eq. 7)
V OUT_PP [ V OUT_PP(C) ) V OUT_PP(ESR) ) V OUT_PP(ESL)
(eq. 5)
V OUT_PP(ESL) +
ESL
ESL ) L
@ V IN
(eq. 8)
where VOUT_PP(C) is a ripple component by an equivalent
and the peak ? to ? peak ripple current is
total capacitance of the output capacitors, VOUT_PP(ESR)
is a ripple component by an equivalent ESR of the output
capacitors, and VOUT_PP(ESL) is a ripple component by
I L_PP +
V IN * V OUT @ V OUT
V IN @ f SW @ L
(eq. 9)
an equivalent ESL of the output capacitors. In PWM
http://onsemi.com
11
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| NCP6334BMTBBTBG | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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| NCP6334CMTAATBG | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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