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| 型号： | LTC3829EUHF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC38 |
| 封装： | 5 X 7 MM, LEAD FREE, PLASTIC, M0-220WHKD, QFN-38 |
| 文件页数： | 17/40页 |
| 文件大小： | 478K |
| 代理商： | LTC3829EUHF#PBF |
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LTC3829
3829f
applicaTions inForMaTion
The Figure 10 graph shows that the peak RMS input
current is reduced linearly, inversely proportional to the
number N of stages used. It is important to note that the
efficiency loss is proportional to the input RMS current
squared and therefore a 3-stage implementation results
in 90% less power loss when compared to a single-phase
design. Battery/input protection fuse resistance (if used),
PC board trace and connector resistance losses are also
reduced by the reduction of the input ripple current in a
PolyPhase system. The required amount of input capaci-
tance is further reduced by the factor N, due to the effective
increase in the frequency of the current pulses. Ceramic
capacitors are becoming very popular for small designs
but several cautions should be observed. X7R, X5R and
Y5V are examples of a few of the ceramic materials used
as the dielectric layer, and these different dielectrics have
very different effect on the capacitance value due to the
voltage and temperature conditions applied. Physically,
if the capacitance value changes due to applied voltage
change,thereisaconcommitantpiezoeffectwhichresults
in radiating sound! A load that draws varying current at an
audible rate may cause an attendant varying input voltage
on a ceramic capacitor, resulting in an audible signal. A
secondary issue relates to the energy flowing back into
a ceramic capacitor whose capacitance value is being
reducedbytheincreasingcharge.Thevoltagecanincrease
ataconsiderablyhigherratethantheconstantcurrentbeing
supplied because the capacitance value is decreasing as
thevoltageisincreasing!Nevertheless,ceramiccapacitors,
when properly selected and used, can provide the lowest
overall loss due to their extremely low ESR.
The selection of COUT is driven by the required effective
seriesresistance(ESR).TypicallyoncetheESRrequirement
is satisfied the capacitance is adequate for filtering. The
steady-state output ripple (
VOUT) is determined by:
V
I
ESR
NfC
OUT
RIPPLE
OUT
≈
+
1
8
where f = operating frequency of each stage, N is the
number of output stages, COUT = output capacitance and
IL = ripple current in each inductor. The output ripple is
highestatmaximuminputvoltagesince
ILincreaseswith
input voltage. The output ripple will be less than 50mV at
maximum VIN with IL = 0.4IOUT(MAX) assuming:
COUT required ESR < N RSENSE
and
C
Nf R
OUT
SENSE
> ( )(
)
1
8
DUTY FACTOR (VOUT/VIN)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
0.6
0.5
0.4
0.3
0.2
0.1
0
3829 F10
RMS
INPUT
RIPPLE
CURRENT
DC
LOAD
CURRENT
6-PHASE
4-PHASE
12-PHASE
3-PHASE
2-PHASE
1-PHASE
Figure 10. Normalized Input RMS Ripple Current
vs Duty Factor for One to Six Output Stages
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3829IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3829IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3829IUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3829IUHF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3830-1ES8 | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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