参数资料
| 型号： | ISL6312AIRZ |
| 厂商： | Intersil |
| 文件页数： | 31/35页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 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页第25页第26页第27页第28页第29页第30页当前第31页第32页第33页第34页第35页
ISL6312A
addresses the leading edge. Normally, the trailing edge
dictates the selection of L because duty cycles are usually
less than 50%. Nevertheless, both inequalities should be
0.3
I L (P-P) = 0
I L (P-P) = 0.25 I O
I L (P-P) = 0.5 I O
I L (P-P) = 0.75 I O
evaluated, and L should be selected based on the lower of
the two results. In each equation, L is the per-channel
inductance, C is the total output capacitance, and N is the
number of active channels.
0.2
L ≤ --------------------------------- ? Δ V MAX – ( Δ I ? ESR )
L ≤ 1.25
----------------------------- ? Δ V MAX – ( Δ I ? ESR ) ? ? V IN – V O ?
( Δ I ) 2
2 ? N ? C ? V O
( Δ I ) 2
? N ? C
? ?
(EQ. 47)
(EQ. 48)
0.1
Switching Frequency
There are a number of variables to consider when choosing the
switching frequency, as there are considerable effects on the
upper MOSFET loss calculation. These effects are outlined in
frequency. The lower limit is established by the requirement for
fast transient response and small output-voltage ripple. Choose
the lowest switching frequency that allows the regulator to meet
the transient-response requirements.
Switching frequency is determined by the selection of the
frequency-setting resistor, R T . Figure 21 and Equation 49
are provided to assist in selecting the correct value for R T .
0
0 0.2 0.4 0.6 0.8 1.0
DUTY CYCLE (V O/ V IN )
FIGURE 22. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
For a four-phase design, use Figure 22 to determine the
input-capacitor RMS current requirement set by the duty
cycle, maximum sustained output current (I O ), and the ratio
of the peak-to-peak inductor current (I L,PP ) to I O . Select a
bulk capacitor with a ripple current rating which will minimize
the total number of input capacitors required to support the
RMS current calculated.
The voltage rating of the capacitors should also be at least
R T = 10
[ 10.61 – ( 1.035 ? log ( f S ) ) ]
(EQ. 49)
1.25 times greater than the maximum input voltage.
Figures 23 and 24 provide the same input RMS current
information for three-phase and two-phase designs
respectively. Use the same approach for selecting the bulk
1000
capacitor type and number.
100
0.3
0.2
0.1
I L(P-P) = 0
I L(P-P) = 0.25 I O
I L(P-P) = 0.5 I O
I L(P-P) = 0.75 I O
10
10
100
1k
10k
SWITCHING FREQUENCY (Hz)
FIGURE 21. R T vs SWITCHING FREQUENCY
0
0
0.2
0.4
0.6
0.8
1.0
Input Capacitor Selection
The input capacitors are responsible for sourcing the AC
component of the input current flowing into the upper
MOSFETs. Their RMS current capacity must be sufficient to
handle the AC component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
31
DUTY CYCLE (V IN/ V O )
FIGURE 23. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR 3-PHASE CONVERTER
Low capacitance, high-frequency ceramic capacitors are
needed in addition to the input bulk capacitors to suppress
leading and falling edge voltage spikes. The spikes result from
the high current slew rate produced by the upper MOSFET
turn on and off. Select low ESL ceramic capacitors and place
one as close as possible to each upper MOSFET drain to
minimize board parasitics and maximize suppression.
FN9290.5
February 1, 2011
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6312CRZ-TR5312 | IC CTRLR PWM 4PHASE BUCK 48-QFN |
| ISL6313BIRZ | IC CTRLR PWM 2PHASE BUCK 36-QFN |
| ISL6313IRZ | IC CTRLR PWM 2PHASE BUCK 36-QFN |
| ISL6314IRZ | IC CTRLR PWM 1PHASE BUCK 32-QFN |
| ISL6315IRZ | IC REG CTRLR BUCK PWM VM 24-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6312AIRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6312CRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6312CRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6312CRZ-TK | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6312CRZ-TR5312 | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。