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| 型号： | ISL6562EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD ISL6562 |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，VRM 电源 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 60W |
| 输出电压： | 1.5V |
| 电流 - 输出： | 40A |
| 输入电压： | 5V，12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 400kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL6562 |
ISL6560/62 Evaluation Board
ISL6560 Supply Design Sequence
The ISL6560 data sheet describes in more detail the following equations. There are several changes from the computations in
the body of the data sheet. First, an operating frequency of 400kHz was chosen. Next, this design sequence shows the method of
setting the initial no load voltage at the DAC setting and offsetting the no load voltage 15mV above the programmed DAC voltage.
A. Speci?cations :
Output Current: 40A
Input Voltage: 12V
Output Voltage: VDAC + 15mV
Output Voltage for Calculations:
V DAC = 1.8V + 15mV
Droop Voltage: 65mV
G. Input Capacitor’s RMS Current:
Use the curve of Figure B
0.3
0.2
0.1
Oscillator Frequency: 400kHz (f SW )
0
0
0.1
0.2 0.3
0.4
0.5
R OUT = ---------------------------- = ---------------- = 1.63m ?
I OUT
V IN
B. Calculate R OUT :
V DROOP 65mV
40A
C. Determine Frequency Setting Capacitor CT: .
3000
1000
DUTY CYCLE (V O / V IN )
FIGURE B. CURRENT MULTIPLIER vs. DUTY CYCL E
For 40A with a duty cycle (D) of:
V OUT 1.8V
D = ----------------- = ------------ = 0.15
12V
The multiplier from Figure B is 0.24.
I RMS = 0.24 × 40A = 9.6A
Pensioned 470 μ F, 16V Rubdown ZA series capacitors
have a RMS current rating of 1.6A.
Six capacitors were selected.
100
0
50 100 150 200 250 300 350 400
450 500
H. Current Sense Resistor (R SENSE ) :
R SENSE = ------------------------------------------------ = ------------------------- = 5.07m ?
I RIPPLE
I OUT
∴ Power = I P × D × R SENSE
Power = 24A × 0.15 × 5m ?
V IN – V OUT V OUT 12V – 1.8V 1.8V
200kHz × 8A
L = ---------------------------------- × ----------------- = ----------------------------------- × ------------
f SW
V IN
------------ × ? I
gm × R OUT × 2
CAPACITOR CT (pF)
FIGURE A. OSCILLATOR FREQUENCY vs. TIMING CAPACITOR
From curve above, for 400kHz use 120pF.
D. Select Inductor Ripple Current ( ? I L ):
Choose 40% of IOUT
? I L = 40A × 0.4 = 16A
Or 8A / Channel
E. Determine the Inductors:
12V
2 L
= 956nH
V CS ( TH ) MIN 142mV
20A + 8A
--------------- + -------------------------
2 2
Use a 5m ? resistor
I. R SENSE Dissipation:
I RMS = I PEAK D
2
Where: I P = 20A + 4A = 24A (Using half 0f ripple current
2
= 432mW Used a 1W resistor
J. R L Selection:
ni × R SENSE 12.5 × 5m ?
2.2mS × 1.63m ? × 2
R L = ------------------------------------------ = -------------------------------------------------------- = 8.7k ?
ni = ? V COMP / V CS (from data sheet)
am Ampli?er Gain = gm × RL = 2.2mS × 8.7k = 19.1
F. Output Capacitors:
8A × 5m ? × 12.5
Capacitor ESR ? R OUT = 1.63m ?
Sonya 1500 μ F, 4V OS-CON Capacitors
have an ESR < 10m ?
Six capacitors < 1.66m ?
Total Capacitance = 9mF
K. V SET Computation for No Load Voltage = DAC:
V OUT , the no load voltage programed to the DAC voltage
V S E T , the voltage set at the COMP pin
I RIPPLE × R SENSE × ni
VSET = 1V + ----------------------------------------------------------------------
2
= 1V + ---------------------------------------------
2
= 1V + 250mV = 1.25V
10
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| ISL6563CR | 功能描述:IC CTRLR PWM MULTIPHASE 24-QFN RoHS:否 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) |
| ISL6563CR-T | 功能描述:IC CTRLR PWM MULTIPHASE 24-QFN RoHS:否 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) |
| ISL6563CR-TK | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6563CRZ | 功能描述:电流型 PWM 控制器 P6 TWO PHS CONT INTEGRTD DRVRS DESKT RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6563CRZ-T | 功能描述:电流型 PWM 控制器 P6 TWO PHS CONT INTEGRTD DRVRS DESKT RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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