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| 型号： | ISL6559CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 18/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 4MHz |
| 占空比： | 75% |
| 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： | 32-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6559
Application on page 3). Figure 15 and Equation 29 are
provided to assist in the selecting the correct value for R T .
1000
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 1.25 times greater
than the maximum input voltage.
Figures 16 and 17 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.
100
0.3
I C,PP = 0
I C,PP = 0.25 I O
I C,PP = 0.5 I O
I C,PP = 0.75 I O
0.2
10
10
100 1000
10000
SWITCHING FREQUENCY (kHz)
0.1
FIGURE 14. R T vs SWITCHING FREQUENCY
R T = 10
[ 11.09 – 1.13 log ( f S ) ]
(EQ. 29)
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.
0.3
DUTY CYCLE (V IN / V O )
FIGURE 16. NORMALIZED INPUT-CAPACITOR RMS CURRENT
VS DUTY CYCLE FOR 3-PHASE CONVERTER
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
close as possible to each upper MOSFET drain to minimize
board parasitics and maximize suppression.
0.2
0.1
0.3
0.2
I C,PP = 0
I C,PP = 0.25 I O
I C,PP = 0.5 I O
I C,PP = 0.75 I O
I C,PP = 0
I C,PP = 0.5 I O
0
0
I C,PP = 0.75 I O
0.2
0.4
0.6
0.8
1.0
0.1
DUTY CYCLE (V IN / V O )
FIGURE 15. NORMALIZED INPUT-CAPACITOR RMS CURRENT
VS DUTY CYCLE FOR 2-PHASE CONVERTER
0
0
0.2
0.4
0.6
0.8
1.0
For a two phase design, use Figure 15 to determine the
input-capacitor RMS current requirement given the duty
cycle, maximum sustained output current (I O ), and the ratio
of the combined peak-to-peak inductor current (I C,PP ) to I O .
18
DUTY CYCLE (V IN / V O )
FIGURE 17. NORMALIZED INPUT-CAPACITOR RMS CURRENT
VS DUTY CYCLE FOR 4-PHASE CONVERTER
FN9084.8
December 29, 2004
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6559CRZ-TR5265 | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6559EVAL1 | 功能描述:EVALUATION BOARD ISL6559 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6559EVAL2 | 功能描述:EVALUATION BOARD 2 ISL6559 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6560 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6560C WAF | 制造商:Intersil Corporation 功能描述: |
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