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| 型号： | ISL6316CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 27/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 275kHz |
| 占空比： | 66.7% |
| 电源电压： | 4.75 V ~ 5.25 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： | 0°C ~ 70°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6316
Input Supply Voltage Selection
The VCC input of the ISL6316 can be connected either
directly to a +5V supply or through a current limiting resistor to
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
a +12V supply. An integrated 5.8V shunt regulator maintains
the voltage on the VCC pin when a +12V supply is used. A
300 Ω resistor is suggested for limiting the current into the
VCC pin to a worst-case maximum of approximately 25mA.
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 MOSFETs , and they establish the upper limit for
0.2
0.1
the switching frequency. The lower limit is established by the
requirement for fast transient response and small output-
0
0
0.2
0.4
0.6
0.8
1.0
voltage ripple as outlined in Output Filter Design . 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 (see the figures labeled Typical
Application on pages 4, 5, 6 and 7). Equation 38 is provided to
assist in selecting the correct value for R T .
DUTY CYCLE (V O/ V IN )
FIGURE 21. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 3-PHASE CONVERTER
0.3
R T = --------------------------
10
2.5X10
F S
Input Capacitor Selection
(EQ. 38)
0.2
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
0.1
I L,P-P = 0
I L,P-P = 0.5 I O
handle the AC component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
0
0
I L,P-P = 0.75 I O
0.2
0.4
0.6
0.8
1.0
For a two phase design, use Figure 22 to determine the input-
capacitor RMS current requirement given the duty cycle,
maximum sustained output current (I O ), and the ratio of the
per-phase peak-to-peak inductor current (I L,P-P ) to I O . Select
DUTY CYCLE (V O /V IN )
FIGURE 22. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 2-PHASE CONVERTER
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
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
should also be at least 1.25 times greater than the maximum
input voltage.
0.2
Figures 21 and 23 provide the same input RMS current
information for three and four phase designs respectively. Use
the same approach to selecting the bulk capacitor type and
number as described above.
0.1
Low capacitance, high-frequency ceramic capacitors are
needed in addition to the bulk capacitors to suppress leading
and falling edge voltage spikes. The result from the high
current slew rates produced by the upper MOSFETs turn on
and off. Select low ESL ceramic capacitors and place one as
0
0
0.2
0.4
0.6
0.8
1.0
close as possible to each upper MOSFET drain to minimize
board parasitic impedances and maximize suppression.
27
DUTY CYCLE (V O/ V IN )
FIGURE 23. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
FN9227.1
December 12, 2006
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| ISL6316IRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR INDUSTRIAL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6316IRZ-T | 功能描述:软开关 PWM 控制器 W/ANNEAL ISL6306 CNTRLR INDUSTRIAL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6322CRZ | 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) |
| ISL6322CRZ-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) |
| ISL6322GCRZ | 功能描述:IC CTRLR PWM 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) |
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