参数资料
| 型号： | NCP5332ADW |
| 厂商： | ON Semiconductor |
| 文件页数： | 25/30页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 2PH DRVR/DAC 28SOIC |
| 产品变化通告： | Product Obsolescence 30/Sept/2009 |
| 标准包装： | 26 |
| 应用： | 控制器，高性能处理器 |
| 输入电压： | 4.5 V ~ 14 V |
| 输出数： | 2 |
| 输出电压： | 可调 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页
NCP5332A
VCSREF,MAX ) VCOn,MAX ) 310 mV @ D v 2.45 V
(35)
NOUT,MIN + ESR per capacitor @
D IO,MAX
D VO,MAX
(1)
(VIN * VOUT) @ VOUT
( a @ IO,MAX @ VIN @ fSW)
+
where:
VCSREF,MAX + Max VID Setting w AVP @ Full Load
VCOn,MAX + [VCSn * VCSREF] @ GCSA,MAX
+ (IO,MAX 2 ) D ILo 2) @ RMAX
@ GCSA,MAX
RMAX + RSENSE or (RL,MAX ) RPCB,MAX)
11. Soft Start Time
If the Soft Start time is defined from the instant the Soft
Start pin is released (i.e. the converter is enabled) to when
the output reaches the VID setting with AVP then the Soft
+ 13 m W @ 45 A (1.630 V * 1.540 V)
+ 6.5 or 7 capacitors minimum (10, 500 m F)
2. Output Inductor Selection
Calculate the minimum output inductance at I O,MAX
according to Equation 4 with ± 20% inductor ripple current
( α = 0.20):
(3)
LoMIN +
(12 V * 1.565 V) @ 1.565 V
(0.2 @ 45 A @ 12 V @ 220 kHz)
+ 687 nH
Start time (t SS ) can be calculated from:
TSS + VCOMP @ CSS ISS
(36)
To save cost, we choose the inexpensive T50 ? 52B core
from Micrometals: 43.5 nH/N 2 , 3.19 cm/turn. According to
the Micrometals catalog, at 22.5 A (per phase) the
where:
VCOMP + VOUT @ 0 A ) Channel_Startup_Offset
) Int_Ramp ) GCSA @ Ext_Ramp 2
C SS is the capacitor from the Soft?Start pin to LGND;
Ext_Ramp = D ? (V IN ? V OUT ) / (R CSn ? C CSn ? f SW );
I SS is the Soft?Start charge current from the data sheet.
permeability of this core will be approximately 70% of the
permeability at 0 A. Therefore, at 0 A we must achieve at
least 687 nH/0.7 or 981 nH. Using five turns of #16AWG
bifilar (2 m ? /ft) will produce 1.1 μ H.
Use Equation 4 to insure the output voltage ripple will
satisfy the design goal with the minimum number of
capacitors and the nominal output inductance:
VOUT,P?P + (ESR per cap NOUT,MIN) @ (4)
Design Example
(VIN * #Phases @ VOUT) @ D
(LoMIN @ fSW)
Typical Design Requirements:
V IN = 12.0 Vdc
V OUT = 1.60Vdc (nominal)
V OUT,RIPPLE < 10 mV PP max
VID Range: 1.100 Vdc ? 1.850 Vdc
I O,MAX = 45 A at full?load
I OUT,LIM = 52 A min at 55 ° C (shutdown threshold)
dI IN /dt = 0.50 A/ μ s max
f SW = 220 kHz
η = 81% min at full?load
T A,MAX = 60 ° C
T J,MAX = 125 ° C
t SS < 10.0 ms (Soft Start time)
? V OUT at no?load (static) =
?30 mV from VID setting = 1.630 Vdc
? V OUT at full?load (static) =
–65 mV from VID setting = 1.565 Vdc
? V OUT at full?load (transient) =
? 95 mV from VID setting = 1.540 Vdc
1. Output Capacitor Selection
First, choose a low?cost, low?ESR output capacitor
such as the Rubycon 16MBZ1500M10X20: 16 V, 1500 μ F,
2.55 A RMS , 13 m ? , 10 × 20mm. Calculate the minimum
number of output capacitors:
+ (13 m W 7) @
(12 V * 2 @ 1.6 V) @ (1.6 V 12 V) (1.1 m H @ 220 kHz)
+ (1.86 m W ) @ {2.38 A}
+ 9.0 mV
The output voltage ripple will be decreased when output
capacitors are added to satisfy transient loading
requirements.
We will need the nominal and worst case inductor
resistances for subsequent calculations:
RL + 5 turns @ 3.19 cm turn @ 0.03218 ft cm @ 2 m W ft
+ 1.03 m W
The inductor resistance will be maximized when the
inductor is “hot” due to the load current and the ambient
temperature is high. Assuming a 40 ° C temperature rise of
the inductor at full?load and a 35 ° C ambient temperature
rise we can calculate:
RL,MAX + 1.03 m W @ [1 ) 0.39% ° C @ (40 ° C ) 35 ° C)]
+ 1.33 m W
The output inductance at full?load will be:
Lo + 0.70 1.1 m H + 770 nH
http://onsemi.com
25
相关PDF资料 |
PDF描述 |
|---|---|
| NCP5378MNR2G | IC CTLR 1PH SYNC BUCK 32QFN |
| NCP5380AMNR2G | IC CTLR SYNC BUCK SGL 32QFN |
| NCP5381AMNR2G | IC BUCK CTLR 2/3/4PHASE 40-QFN |
| NCP5381MNR2G | IC CTLR BUCK 2/3/4PHASE 40-QFN |
| NCP5382MNR2G | IC BUCK CTLR 2-6PHASE 48-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5332ADWR2 | 功能描述:DC/DC 开关控制器 2 Phase Buck w/Gate 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 |
| NCP5338MNR2G | 制造商:ON Semiconductor 功能描述:INTEGRATED DRIVER AND MOS - Tape and Reel 制造商:ON Semiconductor 功能描述:INTEGRATED DRIVER AND MOS - Cut TR (SOS) 制造商:ON Semiconductor 功能描述:REEL / INTEGRATED DRIVER AND MOS 制造商:ON Semiconductor 功能描述:Integrated Driver and MOSFET |
| NCP5351 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:4 A Synchronous Buck Power MOSFET Driver |
| NCP5351/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4A Synchronous Buck Power Mosfet Driver |
| NCP5351D | 功能描述:功率驱动器IC 5V 4A Dual MOSFET RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。